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  • electrodes
  • The measurement electrodes, which are metallic plates, must be sufficiently large to give a measureable change in capacitance. (wikipedia.org)
  • Two metal electrodes held at different electric potential V {\displaystyle V} and separated by a finite distance will induce an electric field E {\displaystyle E} in the region between and surrounding them. (wikipedia.org)
  • Prior to the actual measurements, a calibration and normalization procedure is necessary to cancel out the effects of stray capacitance and any insulating wall between the electrodes and the region of interest to be imaged. (wikipedia.org)
  • The FEA analysis demonstrated that with change of relative permittivity in the DPF due to soot plugging can be estimated by measuring the electrical potential across electrodes. (sae.org)
  • Electrical Capacitance Tomography (ECT) is a method to determine the material distribution within the interior of a closed object by measuring the capacitance values across externally mounted electrodes. (asme.org)
  • Traditionally, an AC excitation pulse is applied to a pair of electrodes that form a capacitor during each measurement step, in order to determine the capacitance from the output current measured. (asme.org)
  • This paper investigates how the speed of inter-electrode capacitance measurement can be improved by comparatively studying three methods that affect the way electrodes are excited and signals are received: 1) multiple-excitation-single-receiving, 2) single-excitation-multiple-receiving, and 3) multiple-excitation-multiple-receiving. (asme.org)
  • Simulations using ECT sensors with 8 and 12-electrodes have shown that measurement speed can be increased by up to 3 ∼ 30 times as compared to the traditional mode of capacitance measurement. (asme.org)
  • Industrial Tomography Systems' scanning technology works on a similar principle to CAT scanners that are used in hospitals to see inside the human body: by passing an electric current very rapidly between pairs of electrodes that are in contact with the process media, real-time images of the industrial process can be extrapolated from measuring the resulting difference in voltages. (wikipedia.org)
  • capacitors
  • Modern capacitors are constructed using a range of manufacturing techniques and materials to provide the extraordinarily wide range of capacitance values used in electronics applications from femtofarads to farads, with maximum-voltage ratings ranging from a few volts to several kilovolts. (wikipedia.org)
  • dynamical
  • Sir W. Thomson, etc. (1873) "First report of the Committee for the Selection and Nomenclature of Dynamical and Electrical Units," Report of the 43rd Meeting of the British Association for the Advancement of Science (Bradford, September 1873), pp. 222-225. (wikipedia.org)
  • temperature
  • A lumped capacitance model, also called lumped system analysis, reduces a thermal system to a number of discrete "lumps" and assumes that the temperature difference inside each lump is negligible. (wikipedia.org)
  • change
  • This is in contrast to hard-field tomography, such as X-ray CT, where the electric field lines do not change in the presence of a test subject. (wikipedia.org)
  • The shape, size and position of the fixed plate relative to the reed has an effect on the capacitance change as a function of the reed's instantaneous position during its travel. (wikipedia.org)
  • consists
  • The electrode geometry consists of two 4 x 4 parallel planes of copper conductors connected through custom built switch electronics to a commercially available capacitance to digital converter. (ucf.edu)
  • changes
  • The position of the fixed plate in the Pianet is such that the capacitance changes most dramatically when the reed is in the upper portion of its travel. (wikipedia.org)
  • method
  • Automated patch clamping is beginning to replace manual patch clamping as a method to measure the electrical activity of individual cells. (wikipedia.org)
  • values
  • This was based on numerical simulations to ensure that the measured capacitance values are within the detectable range of the ECT system. (whiterose.ac.uk)
  • Capacitance values of 1 pF or lower can be achieved by twisting two short lengths of insulated wire together. (wikipedia.org)
  • current
  • This was because the electron energy levels in each metal shifted differently and a potential difference between the junctions created an electrical current and therefore a magnetic field around the wires. (wikipedia.org)
  • displaystyle
  • The capacitance C {\displaystyle C} is a measure of electric energy W {\displaystyle W} stored in the medium, which can be quantified via the following relation: W = 1 2 ∫ ε E 2 d v = 1 2 C V 2 {\displaystyle W={\frac {1}{2}}\int _{}^{}\varepsilon E^{2}\,dv={\frac {1}{2}}CV^{2}} where E 2 {\displaystyle E^{2}} is the square magnitude of the electric field. (wikipedia.org)
  • Systems
  • The technician is essentially performing a balancing act trying to watch and manipulate several systems simultaneously (motion, pressure, and electrical signals). (wikipedia.org)
  • measure
  • In the case of cells in suspension, the pipette is completely replaced with a microchip with holes that can create gigaseals and measure the electrical activity. (wikipedia.org)
  • effect
  • A sensitivity map was created illustrating the effect a clogged filter on the internal electric field of the filter. (sae.org)
  • plates
  • The electrostatic pickup used in the Hohner Pianet N electric piano has a fixed plate mounted at a 90 degree angle to the reed, while the fixed plates used in Wurlitzer electrostatic organs are parallel to the reed. (wikipedia.org)
  • circuit
  • The lumped matter discipline is a set of imposed assumptions in electrical engineering that provides the foundation for lumped circuit abstraction used in network analysis. (wikipedia.org)