| Authors |
Smyslov Vladimir Ivanovich, candidate of technical sciences, head of department, Scientific-production Association Measuring Technique (2 Pionerskaya street, Korolev, Moscow region, Russia), vladismyslov@yandex.ru
Burkov Valeryi Dmitrievich, doctor of technical sciences, professor, sub-department of design and production technology of the devices, Moscow State Forest University (1 First Institutskaya street, Mytischi, Moscow region, Russia), vladismyslov@yandex.ru
Potapov Timofey Vladimirovich, candidate of physico-mathematical sciences, senior researcher, Kotel'nikov Institute of Radio engineering and Electronics of RAS (Fryazino branch) (1 Vvedenskogo square, Fryazino, Moscow region, Russia), vladismyslov@yandex.ru
Demin Andrey Nikolaevich, engineer, sub-department of design and production technology of the devices, Moscow State Forest University (1 First Institutskaya street, Mytischi, Moscow region, Russia), vladismyslov@yandex.ru
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| Abstract |
Background. The current issue of experimental determination of the additional error of fiber-optic electric current sensors (VODT) is considered in the article. VODT compared with other current sensors have a number of advantages, which causes them considerable practical interest and already provide their application. The object of the study is the VODT based on crystals with cubic symmetry Bi12SiO20 and Bi12GeO20. The subject of the study is the additional temperature error of measurement of such VODT. The aim of the work is the experimental analysis of the calibration characteristic and the additional temperature error of the VODT.
Materials and methods. he structural scheme of single-pass VODT on crystals with cubic symmetry Bi12SiO20 and Bi12GeO20 is considered. A technique and installation for calibration of VODT is proposed, which allows to build the calibration characteristic of the sensor and to analyze its additional temperature error. When calibrated, VODT is placed in a long solenoid, in which a uniform magnetic field proportional to the current is created when the current flows. The magnitude of the current in the solenoid is set and controlled by the specified program using a computer. It is also possible to set and maintain different temperatures of the solenoid together with the VODT in the temperature range from 20 to 120 ° C. For temperature measurement, an additional temperature sensor is used. The magnetic field of the solenoid, proportional to the current, is measured by the VODT. Its signal through the analogtodigital converter is input to the computer, where it is compared with the set current value. In addition, a signal from the temperature sensor is input into the computer, which allows receiving and comparing the output signals from the VODT at various temperatures. The methodology for measuring the conversion coefficient of VODT is based on the simultaneous recording and analysis of the above signals: signal from the photodetector device VODT; Signal proportional to the magnitude of the magnetic field in the solenoid; The temperature sensor signal. The requirements for the accuracy of measurements for each of the parameters are not worse than 0.1 %.
Сonclusions. A technique and apparatus for experimental studies of the additional temperature error of a fiber-optic electric current sensor based on the Faraday effect in Bi12GeO20 is proposed. These methods allow the construction of a calibration characteristic and measurement of the drifts of the conversion coefficient of the VODT sensor with an accuracy of 0.1 % in the temperature range from 20 to 120 °С. The performed measurements and studies of the temperature dependences of the CHO VODT conversion coefficient on the basis of Bi12SiO20 crystals showed that the theoretically and practically achievable is an additional temperature error of 0.4 % for 100 °С.
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