Accelerometers are used in a variety of applications ranging from navigation systems to stand-alone tests. In each application, the accuracy of the accelerometer is crucial. There are various calibration techniques that range in precision, yet each apparatus devised to calibrate the accelerometer is quite complex. A calibration method of less complexity is desired to calibrate stand-alone accelerometers that require moderate accuracy. One stand-alone accelerometer, the X16-1D, was used to investigate calibration techniques. Six calibration techniques were investigated to determine an efficient method to calibrate a stand-alone accelerometer. Each method provided a different acceleration component that was modeled by theoretical equations. For all six methods, test variables were established to determine the accelerometers ability to track acceleration. Each test was compared to the theoretical acceleration model to determine the effectiveness of the calibration technique. The overall errors of each
A novel method is introduced for developing calibration models for the spectroscopic measurement of chemical concentrations in an aqueous environment. To demonstrate this matrix-enhanced calibration procedure, we developed calibration models to quantitate glucose and glutamine concentrations in an insect cell culture medium that is a complex mixture of more than 20 components, with three components that manifest significant concentration changes. Accurate calibration models were generated for glucose and glutamine by using a calibration data set composed of 60 samples containing the analytes dissolved in an aqueous buffer along with as few as two samples of the analytes dissolved in culture medium. Standard errors of prediction were 1.0 mM for glucose and 0.35 mM for glutamine. The matrix-enhanced method was also applied to culture medium samples collected during the course of a second bioreactor run. Addition of three culture medium samples to a buffer calibration reduced glucose prediction errors from
Two multivariate calibration methods are compared for the simultaneous chromatographic determination and separation of Sulfamethoxazole (SMX) and Phthalazine (PHZ) by High Performance Liquid Chromatography (HPLC). Multivariate calibration techniques such as Classical Least Squares (CLS) and Inverse Least Squares (ILS) were introduced into HPLC to determine the quantification by using UV detector at 235, 250, 260 and 270 nm. Sixteen binary mixtures of SMX and PHZ as calibration set and eight binary mixtures as prediction set were used. Results show that, Relative Errors of Prediction (REP) of CLS and ILS for SMX and PHZ were 0.17%, 0.63% and o.15%, 0.56%, respectively.
We describe a new resist model calibration procedure and its implementation in LithoCruiserTM. In addition to the resist calibration, LithoCruiser is used to perform simultaneous optimization for numerical aperture (NA), mask OPC, and illumination profile with built-in manufacturing constraints for ASML illumination diffractive optical elements (DOE). This calibration procedure uses a global optimization algorithm for resist parameter tuning, matching the simulated and measured 2D resist contours at a user-defined multiple CD sampling across the selected developed 2D resist patterns. Using lumped parameter type resist models and vector high-NA simulation engine, this resist calibration procedure showed an excellent calibration capability of max CD error range < ±4nm for the CPL 70nm DRAM patterns. Calibration results for CPL 130nm contact hole patterns are also included in this manuscript. Dependency of the calibrated model parameters on lithography process (i.e., Quasar, C-Quad illumination ...
An advanced wavelength calibration process with higher wavelength accuracy is developed based on the conventional calibration method of micro-spectrometers with multichannel detectors. The deficiencies of the conventional method in acquiring sufficient well-spaced and adequately accurate wavelength-pixel data for calibration are analyzed. And three steps are added to the conventional method before the final pixel-wavelength fit is carried out. First, segmented data collection is carried out to ensure sufficient well-spaced lines for calibration. Second, sub-pixel analysis is executed to increase sampling rate. Third, peak fit is implemented to acquire more accurate central wavelength positions. The simulated experiment was based on a compact spectrometer with a crossed Czerny-Turner optical design. Mercury and Argon line spectra are used as wavelength standards. A linear image sensor with 1024 pixels each 25μm in width is used as the detector. In the new calibration process the whole spectral ...
Closes an open external calibration session. LabVIEW NXG does not support FPGA devices Not supported in VIs that run in a web application DAQmx Close External Calibration.vi :/lvdaqmx.chm::/mxcloseextcal.html calHandle in calHandle in is a reference to the calibration session that you creat
Nowadays, a large number of chiral analyses are needed, simple and rapid methods for the determination of the enantiomeric composition in pharmaceutical products should be developed. The fluoxetine belongs to the most prescribed antidepressant chiral drugs and its enantiomers have a different duration of serotonin inhibition. This study presents cheap and fast alternative to traditional chiral techniques for the determination of the fluoxetine enantiomeric composition by the combination of UV/VIS spectrometry and multivariate calibration. The chiral recognition of the fluoxetine was based on the creating of the diastereomeric complexes with α- and β- cyclodextrin. Multivariate calibration methods, including principal component regression (PCR) and partial least square method (PLS), were used for spectral data evaluation. Small differences in results between eachcyclodextrin and both calibration models were obtained by multivariate calibration. PLS model for determination of the enantiomeric ...
The IIP2 requirement in fully integrated direct-conversion receivers using FDD duplexing is prohibitively high and demands the use of an external filter in order to attenuate the leakage from the transmitter. This paper presents a digital calibration technique for passive CMOS down-converters that allows a direct conversion receiver achieve the requirements without external filtering. A Least-Mean-Square optimization algorithm is used in order to reduce the low-frequency second-order intermodulation product. The algorithm controls the digital calibration structures at the biasing of the passive mixer and adapts them until the second order intermodulation drops below the noise level. The method is tested by calibrating a 1.2-V 65nm CMOS passive mixer targeting UMTS/LTE applications at several corner conditions including worst case mismatches in the switching pairs.. ...
A new method for performing a full two-port s-parameter calibration in free-space is presented. The proposed calibration technique computes the error coeff
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Starts an external calibration session on a device. LabVIEW NXG does not support FPGA devices Not supported in VIs that run in a web application DAQmx Initialize External Calibration.vi |helpdir|:/lvdaqmx.chm::/mxinitextcal.html device in device in is the name as configured in MAX of the device to w
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Calibration Criteria. Note: Do not apply the brake pedal during the brake pedal position (BPP) sensor calibration procedure. Any movement of the brake pedal during this procedure will cause the calibration procedure to fail. If this occurs, the sensor calibration must be repeated.. Brake pedal position (BPP) sensor calibration must be performed after the sensor or body control module (BCM) have been serviced. The calibration procedure will set the sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via serial data.. Calibration Procedure. ...
TY - JOUR. T1 - Geometric calibration of the SND detector electromagnetic calorimeter. AU - Korol, A. A.. AU - Melnikova, N. A.. PY - 2017/3/1. Y1 - 2017/3/1. N2 - This paper presents the design, implementation and validation of the software alignment procedure used to perform geometric calibration of the electromagnetic calorimeter with respect to the tracking system of the SND detector which is taking data at the VEPP-2000 e+e− collider (BINP, Novosibirsk). This procedure is based on the mathematical model describing the relative calorimeter position. The parameter values are determined by minimizing a χ2 function using the difference between particle directions reconstructed in these two subdetectors for e+e−→e+e− scattering events. The results of the calibration applied to data and MC simulation fit the model well and give an improvement in particle reconstruction. They are used in data reconstruction and MC simulation.. AB - This paper presents the design, implementation and ...
Improved Calibration vector network analyzer calibration method of storing sparse data, using the measurements from each of the vector network analyzer calibration data sparse system error interpolated data, and system data and uncorrected errors from each frequency measurement measurement data to create measurement data calibration. It may be measured by the measuring frequency range greater than the specified frequency range of calibration every N th frequency step, or by the measurement of the calibration of each frequency step of the frequency range and the length measurement data obtained by compression, to produce calibration data sparse. Interpolation algorithm may be used by fitting a polynomial curve fitting parameters such as curve algorithm.
The need for custom footwear among the consumers is growing every day. Serious research is being undertaken with regards to the fit and comfort of the footwear. The integration of scanning systems in the footwear and orthotic industries have played a significant role in generating 3D digital representation of the foot for automated measurements from which a custom footwear or an orthosis is manufactured. The cost of such systems is considerably high for many manufacturers due to their expensive components, complex processing algorithms and difficult calibration techniques. This thesis presents a fast and robust calibration technique for a low-cost 3D laser scanner. The calibration technique is based on determining the mathematical relationship that relates the image coordinates to the real world coordinates. The relationship is determined by mapping the known real world coordinates of a reference object to its corresponding image coordinates by multivariate polynomial regression. With the ...
AVL CRETA 5™ is a calibration data lifecycle management system designed for the calibration of all vehicle control units. It supports and facilitates your agile calibration process by helping engineers perform their tasks faster and more efficiently. Support Your Agile Calibration Process ...
Ohaus Pioneer PA4202C precise scale weighs up to 4200 grams in 0.01 gram increments and has internal motorized calibration. A simple press of the CAL keypad starts the internal calibration.
Zhang model [two][3] can be a camera calibration process that makes use of traditional calibration procedures (identified calibration factors) and self-calibration methods (correspondence concerning the calibration details when they are in different positions). To execute an entire calibration from the Zhang technique at least three different pictures of your calibration focus on/gauge are expected, possibly by relocating the gauge or even the digital camera alone ...
The device being calibrated must be running a public release of iOS 10.0 or later. A device running iOS 9 or earlier will be irreparably damaged by the fixture if it is not updated first. It must be awake on the lock screen or the home screen prior to beginning the procedure, and have at least 20% battery remaining. Additionally, the technician must have a Genius Room iMac running the latest version of 3DTouchCal software, and a 3D Touch Calibration Fixture, connected to the iMacs Ethernet port. Often called Horizon machines due to their codename, 3D Touch Calibration Fixtures have the ability to calibrate the display, proximity sensor, and pressure sensors on iPhone 6s or later. They can also pair new Touch ID buttons to a Secure Enclave Processor. They are not to be confused with Display Calibration Fixtures, which are used with iPhone 5 through iPhone 6 Plus during the Display Calibration Procedure. Finally, the device to be calibrated must be wiped clean with a lint-free microfiber cloth ...
The present invention provides a method of calibrating a spectroscopic device for providing a non-invasive measurement of an analyte level in a sample. The method comprises the steps of: (a) providing a plurality of calibration algorithms; (b) taking a set of non-invasive measurements on said sample with said spectroscopic device; (c) calculating a predicted set of analyte levels for each of the calibration algorithms in response to the set of non-invasive measurements, each of the predicted sets of analyte levels being characterized by a variability range, a slope, an R 2 (a square of the correlation between said set of non-invasive measurements and said predicted set of analyte levels), and a standard error of prediction; and (d) selecting an appropriate calibration algorithm by using a suitability score based on the variability range, the slope, the R2 an the standard error of prediction for each of the predicted sets of analyte levels. A method of generating suitable calibration algorithms in step
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Many anisotropic phenomenological yield functions have been proposed in the literature in which their predictive capabilities strongly depend on the experimental calibration data as well as the calibration procedure to identify the anisotropy parameters. In this paper, emphasis is placed upon the experimental and numerical calibration procedure of anisotropic yield functions in the region of shear loading (zero hydrostatic stress with equal and opposite in-plane principal strains and stresses). Conventional anisotropic calibration procedures are shown to introduce non-physical artefacts into constitutive models which manifest as a non-zero hydrostatic stress or through-thickness strains generated under in-plane shear stress that violate the definition of the shear loading condition. To overcome this issue, a new physically necessary constraint is applied on the plastic potential to enforce equal and opposite principal strains in the shear state and correct the shear region of anisotropic yield ...
A method and apparatus for measuring the concentration of an analyte present in a biological fluid is disclosed. The method includes the steps of applying NIR radiation to calibration samples to produce calibration data, analyzing the calibration data to identify and remove outliers, constructing a calibration model, collecting and analyzing unknown samples to identify and remove outliers, and predicting analyte concentration of non-outliers from the calibration model. Analysis of the calibration data includes data pretreatment, data decomposition to remove redundant data, and identification and removal of outliers using generalized distances. The calibration model may utilize principal component regression, partial least squares, multiple linear regression, or artificial neural networks, and reduction using principal component analysis or partial least squares scores. Unknown sample data is analyzed using data pretreatment followed by projection into the calibration model space, and identification and
Electronic balances are precision instruments and are very susceptible to changes in room temperature. Sensitivity must be calibrated whenever required since changes in room temperature influence weight measurement values, which are not supposed to change. This is why the balance captures changes in room temperature that affect sensitivity and automatically starts calibration using built-in weights. This ensures that sensitivity is constant at all times, allowing the operator to concentrate on measurement tasks without having to worry about sensitivity calibration.. The balance starts calibration using built-in weights at preset times of the day. If you set calibration times before important measurements (e.g. before starting work in the morning, or during the lunch or evening break), the balance will automatically start calibration when the preset time is reached. Consistent measurement is possible without worrying about sensitivity calibration.. The balance incorporates motor-driven ...
A visual sensor calibration method of calibrating of a visual sensor in a robot system. A pattern plate is provided on an arm of a robot, and the calibration pattern data (CPDr) of the pattern plate on robots base coordinates is sent from a robot controller to a visual sensor controller. The visual sensor controller picks up an image of the pattern plate by a camera to obtain calibration pattern data (CPDc). The calibration data (CD) is obtained from the calibration pattern data (CPDr) and the calibration pattern data (CPDc), to thereby calibrate the visual sensor.
The development of a viable self-calibration approach for use with non-metric cameras was investigated. Both computer generated and actual test camera data were generated to determine the effectiveness of the math model and computer program. A twenty-seven parameter bundle adjustment routine was proposed because of its versatility and compatible use in an existing aerotriangulation package. For the camera and test configuration considered, the focal length was recovered to within two percent, and the principal point location was recovered to wi thin O. 3 to twelve percent. When the computer generated data was used, the focal length and principal point offset were recovered to within 0.2 percent.. Modeling and software has been made available for a future comparative study between the self-calibration and Direct Linear Transformation adjustment parameters. The self-calibration modeling and former Direct Linear Transformation modeling software is a promising tool for mensuration tests and ...
Article Sensitivity of the performance of a conceptual rainfall–runoff model to the temporal sampling of calibration data. The effect of the time step of calibration data on the performance of a hydrological model is examined through a numeric...
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Calibration in atomic-absorption spectrometry is achieved by means of a concentration--gradient chamber using a single concentrated standard solution. Calibration is rapid and extends over the entire working concentration range of the analyte, irrespective of the shape of the conventionally obtained calibration curve. No curve-fitting approximations are involved. With well-designed apparatus, deviations are less than 1%.
Utilizing multiple instructors with deep expertise in dimensional calibration methods and practice, this course is unlike any other calibration course. With hands-on exercises, the first day of this course covers key principles that apply to all calibration situations, such as selection of calibration methods, use of appropriate reference standards, reporting of results, and traceability. Students will perform actual calibrations, learn and practice techniques to improve accuracy of results, and understand how the general principles learned in class can be extended to the development of other calibration methods. Day two of the course moves into a series of demonstrations and hands-on practice of various calibrations, and by the end of day two, the students will have covered all of the most common dimensional calibrations, including micrometers, calipers, dial indicators, test indicators, digital indicators, height gages, and micrometer standards. Day three provides for opportunities to cover ...
Utilizing multiple instructors with deep expertise in dimensional calibration methods and practice, this course is unlike any other calibration course. With hands-on exercises, the first day of this course covers key principles that apply to all calibration situations, such as selection of calibration methods, use of appropriate reference standards, reporting of results, and traceability. Students will perform actual calibrations, learn and practice techniques to improve accuracy of results, and understand how the general principles learned in class can be extended to the development of other calibration methods. Day two of the course moves into a series of demonstrations and hands-on practice of various calibrations, and by the end of day two, the students will have covered all of the most common dimensional calibrations, including micrometers, calipers, dial indicators, test indicators, digital indicators, height gages, and micrometer standards. Day three provides for opportunities to cover ...
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The ZSSC3122 Mass Calibration System provides the hardware needed for simultaneous configuration, calibration and evaluation of multiple ZSSC3122 Capacitive Sensor Signal Conditioner (SSC) ICs. The users PC can communicate via the SSC Communication Board with multiple ZSSC3122 ICs (DUTs) mounted on either the users modules or ZSSC3122 Mass Calibration Reference Boards, which are connected through the Mass Calibration Board (MCB). Each MCB allows connection of up to 24 DUTs. The system can operate with up to 8 MCBs, allowing connection of up to 192 DUTs. The Evaluation Kit Software is available on-line for free download.. For further information and support for the SSC Communication Board, visit the SSC-CB product page.. Additional boards can be ordered separately. To enable product comparisons, this modular kit is compatible with other select IDT devices. Contact your local sales representative for more information.. ...
An identification of the model parameters for a parallel cable-driven robot is performed by using both a calibration and a self-calibration approach. The manipulator studied is based on a parallel architecture having 8 cables to control the 6 degrees of freedom of its mobile platform so that the mobile platform is fully constrained by the cables. Under some hypotheses on cable properties, the interest of redundancy in actuation is exploited to self-calibrate by using proprioceptive sensors. This approach is compared to the difficulties to implement a calibration process. Additionally, advanced tools and algorithmic improvements are presented to perform the parameter identification. A complete experimentation validates the robot accuracy improvement after calibration or self-calibration. We show that the basic hypotheses on cable properties are verified. Moreover, the investment in terms of time and cost to obtain the external measurements for calibration process does not bring better results and does
Fisher Scientific - OHAUS Adventurer Precision Balances with External Calibration - Strikes the ideal balance between inventive features and functional, uncomplicated weighing capabilities.
Fisher Scientific - OHAUS Adventurer Precision Balances with External Calibration - Strikes the ideal balance between inventive features and functional, uncomplicated weighing capabilities.
Multivariate Calibration Harald Martens, Chemist, Norwegian Food Research Institute, Aas, Norway and Norwegian Computing Center, Oslo, Norway Tormod Næs, Statistician, Norwegian Food Research Institute, Aas, Norway The aim of this inter-disciplinary book is to present an up-to-date view of multivariate calibration of analytical instruments, for use in research, development and routine laboratory and process operation. The book is intended to show practitioners in chemistry and technology how to extract the quantitative and understandable information embedded in non-selective, overwhelming and apparently useless measurements by multivariate data analysis. Multivariate calibration is the process of learning how to combine data from several channels, in order to overcome selectivity problems, gain new insight and allow automatic outlier detection. Multivariate calibration is the basis for the present success of high-speed Near-Infrared (NIR) diffuse spectroscopy of intact samples. But the ...
Two important aspects of internal calibration of polarimetric synthetic aperture radar are discussed, i.e., system gain calibration and individual transmit
The transfer of a multivariate calibration model for quantitative determination of diethylene glycol (DEG) contaminant in pharmaceutical-grade glycerin between five portable Raman spectrometers was accomplished using piecewise direct standardization (PDS). The calibration set was developed using a multi-range ternary mixture design with successively reduced impurity concentration ranges. It was found that optimal selection of calibration transfer standards using the Kennard-Stone algorithm also required application of the algorithm to multiple successively reduced impurity concentration ranges. Partial least squares (PLS) calibration models were developed using the calibration set measured independently on each of the five spectrometers. The performance of the models was evaluated based on the root mean square error of prediction (RMSEP), calculated using independent validation samples. An F-test showed that no statistical differences in the variances were observed between models developed on ...
Camera calibration plays a critical role in 3D computer vision tasks. The most commonly used calibration method utilizes a planar checkerboard and can be done nearly fully automatically. However, it requires the user to move either the camera or the checkerboard during the capture step. This manual operation is time consuming and makes the calibration results unstable. In order to solve the above problems caused by manual operation, this paper presents a full-automatic camera calibration method using a virtual pattern instead of a physical one. The virtual pattern is actively transformed and displayed on a screen so that the control points of the pattern can be uniformly observed in the camera view. The proposed method estimates the camera parameters from point correspondences between 2D image points and the virtual pattern. The camera and the screen are fixed during the whole process; therefore, the proposed method does not require any manual operations. Performance of the proposed method is evaluated
This article adresses the hyperbolic catadioptric camera calibration matter.An automatic calibration process has been developped,thus no user intervention is required to perform the camera intrinsic and extrinsic parameters estimation. This process uses a specific calibration pattern built to fit the geometry of the sensor.The pattern features are really easy to identify and allow a robust camera calibration.The performances of the algorithm are illustrated by some examples.. Résumé. Cet article présente une procédure détalonnage pour les caméras panoramiques catadioptriques utilisant un miroir hyperbolique de révolution. Lalgorithme que nous avons développé permet un étalonnage automatique (sans intervention dun opérateur) des paramètres intrinsèques et extrinsèques de la caméra. Il utilise une mire détalonnage particulière,adaptée à la géométrie du capteur. Cette mire contient des formes particulièrement simples à détecter et permet un étalonnage robuste du ...
We propose a computational calibration method for optical tomography. The model of the calibration scheme is based on the rotation symmetry of source and detector positions in the measurement setup. The relative amplitude losses and phase shifts at the optic fibers are modeled by complex-valued coupling coefficients. The coupling coefficients can be estimated when optical tomography data from a homogeneous and isotropic object are given. Once these coupling coefficients have been estimated, any data measured with the same measurement setup can be corrected for the relative variation in the data due to source and detector losses. The final calibration of the data for the source and detector losses and the source calibration between the data and the forward model are obtained as part of the initial estimation for reconstruction. The calibration method was tested with simulations and measurements. The results show that the coupling coefficients of the sources and detectors can be estimated with ...
Camera calibration may refer to: Camera resectioning, which is called also geometric camera calibration Color mapping, which is a method for photometric camera calibration Radiometric ...
Camera calibration is one of the fundamental photogrammetric tasks. The standard procedure is to apply an iterative adjustment to measurements of known control points. The iterative adjustment needs initial values of internal and external parameters. In this paper we investigate a procedure where only one parameter - the focal length is given a specific initial value. The procedure is validated using the freely available Damped Bundle Adjustment Toolbox on five calibration data sets using varying narrow- and wide-angle lenses. The results show that the Gauss-Newton-Armijo and Levenberg-Marquardt-Powell bundle adjustment methods implemented in the toolbox converge even if the initial values of the focal length are between 1/2 and 32 times the true focal length, even if the parameters are highly correlated. Standard statistical analysis methods in the toolbox enable manual selection of the lens distortion parameters to estimate, something not available in other camera calibration toolboxes. A ...
Fisher Scientific™ Fisher Scientific™ Traceable™ Conductivity Calibration Standards Certified Reference Material (CRM) NIST Individual bottle...
Hi, Im a graduate student in Curt Franks group in Chemical Engineering. I am in charge of maintaining and calibrating our DI Nanoscope AFMs. I was wondering if anyone has calibration standards we could borrow for a day or two. Specifically, wed like to find high accuracy vertical calibration standards. We currently have vertical standards of SiO2 steps with +/- 1nm accuracy step heights, but wed like to calibrate our scanners to even higher accuracy (down to angstroms) since we have features on the order of a few nanometers that wed like to characterize. If you have standards we might be able to borrow (or advice or suggestions), please contact me at this email or at 650-723-9140 and it would be greatly appreciated! Thanks! Lisa Hwang ...
250ml Refractometer & Hydrometer Calibration Standard - Brightwell Aquatics 1.0264 Specific Gravity 1.3394 Refractive Index 35 ppt Salinity 53 uS/cm at 25 deg c250ml Brightwell Aquatics Aquarium Reagents Refractometer & Hydrometer Calibration Standard is designed to provide an accurate reference
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): In order to address the difficulty of arranging large calibration objects and the low mea-surement accuracy of small calibration objects in traffic accident scene photogrammetry, a photogrammetric method based on a composite of small calibration objects is proposed. Several small calibration objects are placed around the traffic accident scene, and the co-ordinate system of the composite calibration object is given based on one of them. By maintaining the relative position and coplanar relationship of the small calibration objects, the local coordinate system of each small calibration object is transformed into the coordi-nate system of the composite calibration object. The two-dimensional direct linear trans-formation method is improved based on minimizing the reprojection error of the calibration points of all objects. A rectified image is obtained using the nonlinear optimization method. The increased accuracy of traffic
Among the world’s elite flow calibration facilities, the Badger Meter Flow Dynamics primary and secondary standard calibration laboratories, located in Racine, WI, calibrate most flow meters from any manufacturer. The Flow Dynamics primary standard calibration facility offers superior liquid and gas calibration uncertainties, as documented by the National Voluntary Laboratory Accreditation Program (NVLAP*), Lab Code 200668-0, Scope of Accreditation to ISO/IEC 17025:2005 and NIST Handbook 150. Effective immediately, please send products for calibration to: Badger Meter, Inc. Attn: Calibration Lab 8635 Washington Ave Racine, WI 53406
MESA Specialty supplies petrochemical and refinery gas calibration standards, including natural gas pipeline calibration gas standards. Also available are polymer, sulphur,butadiene gas standard and liquid calibration mixtures.
Image: Michal Marcol / FreeDigitalPhotos.net). Teddington, UK -?? A two day training course on humidity measurement and calibration, covering measurement techniques, terms and definitions;,calculations, traceability and calibration and hands-on laboratory sessions.. The course will open with an introductory session on humidity terms and definitions followed by talks that will cover the necessary background to the subject with full course notes provided. A tour of the NPL Humidity laboratory, plus hands-on sessions, will give a practical introduction to humidity measurement and calibration techniques.. This will be reinforced with talks on uncertainties, traceability and accreditation.. To view the programme, click here for the current/most recent course flyer.. All participants will receive a certificate of attendance.. This course is suitable for technicians and technical managers closely concerned with humidity measurement and calibration.. The course will be given by members of the NPL ...
In a computer tomography system, a flexible calibration phantom is utilized simultaneously with analysis of a patient to ensure accuracy of imagry and to facilitate interpretation of tomographs created. The flexible calibration phantom is preferably placed directly upon a patient between a radiation source and a radiation detector. It includes two solid and flexible samples of reference materials, each having a substantially uniform density, and a solid and flexible encasement surrounding the samples of reference material. The encasement has a substantially uniform density different than that of each of the samples of reference material, and the combination provides suitable reference points for proper analysis of tomographs obtained.
A system and method for radar detection and calibration. By measuring the true range of a calibration target on entry to the radars detection zone, the actual detection capability of the radar in current atmospheric conditions with the actual radar can be determined. The radar system is also adapted to determine a sensed position at a sensed time of a target in the radars detection zone. A calibration target, preferably an unmanned air vehicle (UAV), includes a position device for determining the actual position of the calibration target. A calibration device communicates with the radar system and the calibration target and receives the sensed and actual positions of the calibration target. The calibration device calculates the error between the sensed position and the actual position and adjusts the radar system to minimize the error. The target may include a signal augmentation device to augment the radar cross-section of the target to replicate the radar cross-sections of targets of various types.
A system and method for radar detection and calibration. By measuring the true range of a calibration target on entry to the radars detection zone, the actual detection capability of the radar in current atmospheric conditions with the actual radar can be determined. The radar system is also adapted to determine a sensed position at a sensed time of a target in the radars detection zone. A calibration target, preferably an unmanned air vehicle (UAV), includes a position device for determining the actual position of the calibration target. A calibration device communicates with the radar system and the calibration target and receives the sensed and actual positions of the calibration target. The calibration device calculates the error between the sensed position and the actual position and adjusts the radar system to minimize the error. The target may include a signal augmentation device to augment the radar cross-section of the target to replicate the radar cross-sections of targets of various types.
The increase in the concentration of carbon dioxide (CO2) in the atmosphere has led the scientific community to investigate the adverse effects on humanity and nature, including the greenhouse effect, which contributes to global warming and can lead to climate change, besides the risks associated with human health. Due to the importance of metrological issues in the current scenario, the Laboratory of Gas Analysis (Lanag) of the National Institute of Metrology, Quality and Technology (Inmetro) is developing the methodology of preparation of such primary standard gas mixtures through gravimetry. For the preparation of these standards, an analysis verification step is necessary, carried out by means of an analytical technique of comparison, at low levels of concentration, by cavity ringdown (CRDS) and by gas chromatography using a flame ionization detector coupled to a methaniser catalyst (GC-FIDmeth). This work presents the method validation of both methodologies developed to analyze a range of
EOS satellite instruments operating in the visible through the shortwave infrared wavelength regions (from 0.4 micrometer to 2.5 micrometer) are calibrated prior to flight for radiance response using integrating spheres at a number of instrument builder facilities. The traceability of the radiance produced by these spheres with respect to international standards is the responsibility of the instrument builder, and different calibration techniques are employed by those builders. The National Aeronautics and Space Administrations (NASAs) Earth Observing System (EOS) Project Science Office, realizing the importance of preflight calibration and cross-calibration, has sponsored a number of radiometric measurement comparisons, the main purpose of which is to validate the radiometric scale assigned to the integrating spheres by the instrument builders. This paper describes the radiometric measurement comparisons, the use of stable transfer radiometers to perform the measurements, and the measurement ...
In analytical chemistry, a calibration curve is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration.[1] A calibration curve is one approach to the problem of instrument calibration; other approaches may mix the standard into the unknown, giving an internal standard. The calibration curve is a plot of how the instrumental response, the so-called analytical signal, changes with the concentration of the analyte (the substance to be measured). The operator prepares a series of standards across a range of concentrations near the expected concentration of analyte in the unknown. The concentrations of the standards must lie within the working range of the technique (instrumentation) they are using.[2] Analyzing each of these standards using the chosen technique will produce a series of measurements. For most analyses a plot of instrument response vs. concentration will show a linear ...
0068] In accordance with another aspect of the present invention, there is provided a method of performing internal diameter measurements using a probe apparatus as described herein and a dent calibration standard. A specific example of such a method comprises the following steps: [0069] 1. Setup and prepare the eddy current instrumentation at the location of the inspection; [0070] 2. Connect the probe and verify it is operating correctly; [0071] 3. Insert the probe into the dent calibration standard; [0072] 4. While ensuring that both modules are away from any calibration references, null the probe to balance the electronic bridge; [0073] 5. Review the calibration reference data from the calibration standard and adjust the dent signals so that they deflect vertically as the probe passes over a dent; [0074] 6. Push the probe entirely through the dent calibration standard; [0075] 7. While pulling at a constant speed, record the data as the probe is pulled through and out of the dent calibration ...
Fingerprint Dive into the research topics of Retrospectively supervised click decoder calibration for self-calibrating point-and-click brain-computer interfaces. Together they form a unique fingerprint. ...
are the averages of the x and y measurements and S denotes summation over all n observations. When the points lie exactly on a straight line of positive slope R = +1; when the points lie exactly on a straight line of negative slope R = 1. Mathematically R lies between +1 and 1. Maybe this fact has given rise to the idea that R being near ± 1 indicates a linear relationship between the x and y variables. However values of R which can be considered large can come from markedly non-linear relationships.12,13 Although it has been discussed by many authors, in practice analysts misunderstand this concept. For analytical processes considering instrumental responses the calibration function is usually obtained by means of a calibration experiment; the observations usually represent the result of a physical measurement that must be converted into the analytical result.14 The model equation used is the straight line equation, Yi = b + aXi + ei (with i =1 to n), where Yi is the response variable, Xi the ...
The Testing and Calibration Pillar in KENAS provides accreditation for the recognition of the technical competence of a testing and calibration laboratory for a specific task following ISO/IEC 17025:2005.. KENAS testing and calibration has been established with the objective to provide Government, Industry and Private laboratories in general with a scheme for third-party assessment of the quality and technical competence of testing and calibration laboratories to carry out specific testing, measurements and calibrations. Government of Kenya has authorized KENAS as the sole accreditation body for Testing and Calibration laboratories.. Laboratory Accreditation. The concept of Laboratory Accreditation was developed to provide a means for third-party attestation of the competence of laboratories to perform specific type(s) of testing and calibration.. Laboratory Accreditation provides formal recognition of competent laboratories, thus providing a ready means for customers to find reliable testing ...
Established in 2004, Delta Wye Calibration and Testing Company LLC Dubai, UAE, is meticulous about calibration and testing for all industrial sectors in UAE likely Manufacturing, Oil and Gas, Process Industry, Engineering, Fabrication, Aviation, Medical, Electromechanical, Service and so on.. Adhering to standards equivalent to ISO 9001:2008 & ISO/IEC 17025:2005 demonstrates our service noteworthy & competent. Knowledgeable, Efficient and Proficient Workforce further enables our service and assistance at Delta Wye Calibration and Testing Company LLC to be competent and remain best in the industry.. Delta Wye Calibration and Testing Company LLC provide calibration of highest quality offering a whole range of factory and onsite services. Our calibration and testing services are designed to ensure that your testing system meet or exceed relevant standards. Our team is specialized, trained and supported with necessary tools.. Services Delta Wye Calibration and Testing Company LLC provide includes: ...
Leaf water content is one of the most common physiological parameters limiting efficiency of photosynthesis and biomass productivity in plants including Miscanthus. Therefore, it is of great significance to determine or predict the water content quickly and nondestructively. In this study, we explored the relationship between leaf water content and diffuse reflectance spectra in Miscanthus. Three multivariate calibrations including partial least squares (PLS), least squares support vector machine regression (LSSVR), and radial basis function (RBF) neural network (NN) were developed for the models of leaf water content determination. The non-linear models including RBF_LSSVR and RBF_NN showed higher accuracy than the PLS and Lin_LSSVR models. Moreover, 75 sensitive wavelengths were identified to be closely associated with the leaf water content in Miscanthus. The RBF_LSSVR and RBF_NN models for predicting leaf water content, based on 75 characteristic wavelengths, obtained the high determination
KENNEWICK, Washington - April 19, 2017 - Bruker introduces a new calibration package for the EOS 500 handheld Laser Induced Breakdown Spectrometer (HH-LIBS). In response to customer input, the EOS 500 now has the option to include Iron, Nickel, Copper and Cobalt alloy calibrations, in addition to the existing light metal calibrations (e.g. Aluminum, Titanium and Magnesium base alloys). The EOS 500 is a metals analyzer which can provide rapid grade ID, as well as the chemistry, of the sample under test. This is an excellent choice for either scrap sorting or Positive Material Identification (PMI) measurements; especially for light metals where the measurement is approximately 10x faster than handheld XRF. The EOS 500s rugged design ensures that it will withstand field operation in nearly all environments, including humid and dusty conditions. In addition, the EOS 500 has a unique Air-Flow Optics Shield, which creates a continuous air shield in front of the optics in order to prevent dust ...
On April 14,2003, three Earth remote sensing spacecraft were maneuvered enabling six satellite instruments operating in the visible through shortwave infrared wavelength region to view the Moon for purposes of on-orbit cross-calibration.
TY - JOUR. T1 - Constraining permeabilities in a large-scale groundwater system through model calibration. AU - Ophori, D. U.. PY - 1999/10/12. Y1 - 1999/10/12. N2 - The range of field estimates of permeabilities in rocks of the Atikokan Research Area (ARA), Canada, has been reduced by calibrating a groundwater flow model of the ARA. The flow model was calibrated to the recharge component of the water balance and to measured freshwater heads in boreholes. A good match between field and simulated recharge, and between measured and simulated heads was obtained with two different permeability-depth distributions that differed by up to two orders of magnitude in places. Solute transport simulation of the distributions of total dissolved solids (TDS), chlorides (CI) and oxygen-18 (18O) in groundwater in the area was performed to further refine the permeability estimates. Vertical average linear groundwater velocities from the calibrated flow model were used in one-dimensional solute transport models ...
0076] Sensors described herein may be configured to require no system calibration or no user calibration. For example, a sensor may be factory calibrated and need not require further calibrating. In certain embodiments, calibration may be required, but may be done without user intervention, i.e., may be automatic. In those embodiments in which calibration by the user is required, the calibration may be according to a predetermined schedule or may be dynamic, i.e., the time for which may be determined by the system on a real-time basis according to various factors. Calibration may be accomplished using an in vitro test strip or other calibrator, e.g., a small sample test strip such as a test strip that requires less than about 1 microliter of sample (for example FreeStyle® blood glucose monitoring test strips from Abbott Diabetes Care). For example, test strips that require less than about 1 nanoliter of sample may be used. In certain embodiments, a sensor may be calibrated using only one sample ...
The calibration procedure will automatically perform calibration at four points of rainfall intensity typically in the range 40-80mm/hr.. This allows the company to offer users more detailed technical information on the product and improved service levels.. All gauges will now be supplied with a printed multi-point calibration certificate, essential for traceability of data and product performance auditing.. Gauges are accurate to A correction algorithm is now also provided as standard, allowing users to undertake correction of rainfall data at extremely high rainfall densities if required ( With correction, all tipping buckets provide intensity errors of In addition to the calibration improvements, the funnel outlet diameter on the 0.2mm- and 0.5mm-capacity buckets have been increased to remove funnel back-up effects, reducing cost of ownership and the need for service visits in the field.. All Casella tipping bucket rain gauges are WMO and BMO compliant and calibrated in full compliance with ...
EVERETT, WA--(Marketwire - January 31, 2011) - Fluke Calibration, a global leader in calibration instrumentation and software, has introduced the 1551A Ex and 1552A Ex Stik Thermometers, engineered to give temperature calibration specialists the durable, intrinsically-safe digital instrument they need for precision temperature calibration. The Fluke 1551A and 1552A Stik...
Search and download thousands of Swedish university dissertations (essays). Full text. Free. Dissertation: ATLAS Calorimetry Hadronic Calibration Studies.
TY - RPRT. T1 - Calibration of Nacelle-based Lidar instrument. AU - Yordanova, Ginka. AU - Courtney, Michael. N1 - This is an internal report and therefore not available in full text. Please contact authors or director of authors department for further information.. PY - 2015. Y1 - 2015. N2 - This report presents the result of the lidar calibration performed for a two-beam nacelle based lidar at DTUs test site for large wind turbines at Høvsøre, Denmark. Calibration is here understood as the establishment of a relation between the reference wind speed measurements with measurement uncertainties provided by measurement standard and corresponding lidar wind speed indications with associated measurement uncertainties. The lidar calibration concerns the 10 minute mean wind speed measurements.. AB - This report presents the result of the lidar calibration performed for a two-beam nacelle based lidar at DTUs test site for large wind turbines at Høvsøre, Denmark. Calibration is here understood ...
The rectangular calibration chart 1 comprises a plurality of parallel stripe-like color patches that are distributed into groups 11, ..., 14 of adjacent color patches 111, 112, 113, 114, ..., 118, each stripe-like color patch having a uniform calibration color. The calibration colors of the different stripe-like color patches are regularly distributed in a perceptually uniform visual color space. Thank to this regular distribution, the best compromise can be found between the lowest number of different color patches and the highest accuracy of the calibration of a given color device. Such a calibration chart is advantageously used to correction of non-uniformities of the color device.
Applied Image to Feature Personal Identity Verification Calibration Standards at Photonics West - Dec 30, 2016 - Applied Image, Inc.
A simple, accurate and precise UV-spectrophotometric method based inverse least-squares was developed for the simultaneous determination of atorvastatin and amlodipine in tablet formulation. The absorbance values of the two analytes were linear with the concentration at the wavelengths taken at 5 nm interval over the range of 230 -260 nm. The calibration equations were developed using the absorbance values of nine synthetic mixtures containing different concentrations of two analytes measured at 5 nm intervalsin the range of 230 -260 nm. The developed equations werethen validated by calculating the analytes recovery from the analysis of a set of another five synthetic mixtures, the mean% recoveries were 100.02% and 100.06% with the corresponding% RSD of ±0.36 and±0.51 for atorvastatin and amlodipine, respectively. The calibration equations obtained were then used to obtain the concentration of each analyte in commercial samples. The mean % recoveries were 100.43% and 100.28% with the corresponding%
THE PRIMARY PROBLEM IN USING THE BUREAU OF PUBLIC ROADS ROUGHOMETER AT THE AASHO ROAD TEST HAS BEEN THE VARIABILITY OF THE INSTRUMENT. FREQUENT CALIBRATION HAS BEEN FOUND TO BE NECESSARY. USING THE ROAD TEST PROFILOMETER AS A STANDARD, A METHOD HAS BEEN DEVELOPED WHEREBY THE WHOLE DYNAMIC SYSTEM OF THE ROUGHOMETER CAN BE CALIBRATED. THIS PAPER DESCRIBES THE CALIBRATION TECHNIQUE FOR THE ROUGHOMETER AND ITS USE AT THE AASHO ROAD TEST, INCLUDING METHODS FOR MAKING PRESENT SERVICEABILITY DETERMINATIONS. /AUTHOR/. ...
Government Contract Award: A--Space Based Optical Sensor Calibration Approaches. Access many more A - Research and Development Awards | Get your Free Government Bids Alert!
Four size exclusion chromatography (SEC) calibration techniques were tested for use in the molecular weight characterisation of Streptococcal Hyaluronic Acid (HA). An exponential equation, evaluated using the Hamielec method, was superior to the customary peak position method. It provided the most accurate estimates of the weight average molecular weight, Mw. The calibration was valid for HA in the range 800 - 2500 kDa, and permitted the calculation of both polydispersity and molecular weight distributions for HA from Streptococcal fermentations. This exponential calibration approach should have application in the characterisation of other large biopolymers, particularly where pore size of available SEC media is limiting ...
Radar, Satellite tracking systems, Calibration, Self operation, Errors, Least squares method, Equations of motionThe report describes a radar calibration procedure currently in use at the Air Force Eastern Test Range AFETR - a procedure which uses only a single radars own passive tracking data of two successive passes of a satellite in conjunction with the theoretical equations of motion, known physical constants and associated computer program. No external tracking data or externally computed ephemeris is involved. Under routine conditions the zero-set biases and mislevel are estimated to an accuracy of 20 feet in range and 0.03 milliradians in angles. Under good conditions five other radar error model coefficients can be determined to comparable accuracy. The present maintained accuracy level of the AFETR radars is described. Author
We have shown that when it is used to monitor preterm infants receiving supplemental oxygen, the Masimo SET Radical pulse oximeter returns a reduced number of values of 87-90%. This is explained by the internal calibration algorithm, which changes in this region and adjusts SpO2 values above 87% upwards. A new software algorithm removed this artefact and returns a distribution of values that is similar to other current oximeters.. According to the product information, the oximeter is validated for accuracy in human blood studies on healthy adult volunteers in induced hypoxia studies in the range of 70-100% SpO2 against a laboratory CO-oximeter. This variation equals ±1 SD, which encompasses 68% of the population. The stated accuracy for neonates is ±3%, so by this standard at least 68% of the time the displayed SpO2 reading should be within ±3% of the simultaneous CO-oximeter value on an arterial blood sample. In this regard the original oximeter performs within all recommended accuracy ...
Our calibration laboratory is Accredited to ISO/IEC 17025:2017 by A2LA and all calibrations performed are Traceable to the International System of Units (SI) via National Metrology Institutes (NMI) that are signatories to the CIPM Mutual Recognition Arrangement such as the National Institute of Standards and Technology (NIST) and comply with ANSI/ NCSL Z540-1-1994 and ANSI/ NCSL Z540.3-2006.. Click Here for a copy of our certificate and scope of accreditation.. Our laboratory is fully equipped with automated test stations running the latest OEM and commercial calibration procedures for necessary diagnostics, adjustments and providing our customers with full performance data on their equipment.. ...