| Authors |
Demin Andrey Nikolaevich, engineer, Moscow State Forest University (1 First Institutskaya st., Mytischi, Moscow region, Russia), vladismyslov@yandex.ru
Smyslov Vladimir Ivanovich, candidate of technical sciences, head of department, Scientific-Production Association Measuring Equipment (2 Pionerskaya st., Korolev, Moscow region, Russia), vladismyslov@yandex.ru
Potapov Timofei Vladimirovich, candidate of physical and mathematical sciences, senior researcher, Institute of Radio engineering and Electronics named after V. A. Kotelnikov of RAS (Fryazino branch) (1 Vvedenskogo sq., Fryazino, Moscow region, Russia), vladismyslov@yandex.ru
|
| Abstract |
Background. Experimental studies of the basic error of measurement of fiberoptic electric current sensor based on the Faraday effect in Bi12GeO20 and Bi12GeO20. Relevance and purpose. The article deals with the topical issue of experimental determination of basic error of fiber-optic sensors of electric current (VADT). VOGT, compared to other current sensors have several advantages, which causes them considerable practical interest and are already providing their use. The object of the study are VOT on the basis of crystals with cubic symmetry Bi12SiO20 and Bi12GeO20. The subject of research is the basic error of measurement of such VOT. The aim of this work is the experimental analysis of the calibration characteristics and the basic error of measurement, VOT.
Materials and methods. Structural diagram of singlepass, VOD for crystals with cubic symmetry Bi12SiO20 and Bi12GeO20. The proposed method and scheme of calibration VOGT, allowing for the construction of the conversion characteristic of the sensor and to analyze the components of his basic error. During calibration, VOGT placed in a long solenoid, in which the flow of current creates a homogeneous magnetic field proportional to the current. The magnitude of the current in the solenoid is set and regulated for a given program using the computer. The magnetic field of the solenoid proportional to the current, measured, VOGT. Its signal via analog-to-digital Converter is entered into the computer, where it is compared with a predetermined current value.
Results. The analysis of the calibration characteristics and its constituent basic error of measurement showed that the response of the sensor is linear. Random measurement errors, VOGT due to noise of the entire measurement channel, VOD: fluctuations of the source power of the radiation noise of a photodetector, a fluctuation of power losses of radiation in optical fibers and connectors, lgmodule noise arising in the process of light propagation in the fiber. These noises reduce accuracy of measurement. On the accuracy of measurements also affect the error of the calibration means, among which the most significant is the quantization error of the ADC. The probability density distribution of the measured values of the currents VOGT ensemble of independent values satisfactorily describe the laws of Gauss.
Conclusions.The proposed method and scheme of experimental investigations the basic error of fiber-optic electric current sensor based on the Faraday effect in Bi12GeO20, which enables the construction of calibration characteristics and a study of the basic error of VOT. The causes of and quantity components of the basic error of measurement, VADT based on the Faraday effect in Bi12GeO20. The analysis of errors showed that these sensors can provide the basic relative error of measurement of electric current, not exceeding ±1 %. To reduce the basic error of measurement, VODT necessary to use special additional measures related both to the constructive and technological methods of reducing the basic error.
|
