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Electric field of a symmetrically excited shielded capacitor with additional electrodes
https://doi.org/10.32446/0368-1025it.2022-9-52-56
Abstract
The main element of the reference field-forming system of the State primary standard of the unit of electric field strength in the frequency range from 0 to 20 kHz GET 158-2020 is a reference converter consisting of a shielded capacitor with flat round plates and additional electrodes connected to an AC or DC voltage source. Due to the approval of the standard in the specified composition and the change in the power supply scheme of the reference field-forming system from symmetric to symmetrical, the maximum value of the voltage reproduced by the standard has been increased from 2000 to 4000 V/m and the accuracy of its reproduction and transmission has been increased. For the case of symmetrical power supply, it was necessary to derive a measurement equation linking the reproducible value and the input parameters of the reference converter (voltage, geometric dimensions). The derivation of the measurement equation of a reference converter excited by a symmetric voltage is presented, obtained as a result of solving an electrostatic problem with symmetric boundary conditions for the potential of the electrodes. Optimal values of the voltages applied to the additional electrodes are found in order to obtain maximum uniformity of the electric field in the area of the center of the converter. It is shown that the inhomogeneity of the field for a specific implementation of a shielded capacitor is no more than 0.1 %. The results obtained can be used in the fi eld of metrology of constant and variable electric fields in the development of reference sources of electric field and working standards.
About the Authors
V. A. Tishchenko
Russian Metrological Institute of Technical Physics and Radio Engineering Measurements
Russian Federation
Russian Federation
Vladimir A. Tishchenko
Mendeleevo, Moscow region
V. I. Lukyanov
Russian Metrological Institute of Technical Physics and Radio Engineering Measurements
Russian Federation
Russian Federation
Volemir I. Lukyanov
Mendeleevo, Moscow region
A. A. Smirnov
Russian Metrological Institute of Technical Physics and Radio Engineering Measurements
Russian Federation
Russian Federation
Alexey A. Smirnov
Mendeleevo, Moscow region
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Review
For citations:
Tishchenko V.A., Lukyanov V.I., Smirnov A.A. Electric field of a symmetrically excited shielded capacitor with additional electrodes. Izmeritel`naya Tekhnika. 2022;(9):52-56. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-9-52-56
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