METROLOGICAL ANALYSIS OF FIBER-OPTIC ELECTRIC CURRENT SENSORS BASED
ON CRYSTALS WITH CUBIC SYMMETRY Bi12SiO20 AND Bi12GeO20

Demin Andrey Nikolaevich, engineer, Moscow State Forest University (1st Institutskaya street, 1, Mytischi, Moscow region, Russia), vladismyslov@yandex.ru
Smyslov Vladimir Ivanovich, candidate of technical sciences, head of department, Scientific and Production Association Measuring Technique (2 Pionerskaya street, Korolev, Moscow region, Russia), vladismyslov@yandex.ru
Klement'ev Aleksey Terent'evich, candidate of technical sciences, leading specialist, Scientific and Production Association Measuring Technique (2 Pionerskaya street, Korolev, Moscow region, Russia), vladismyslov@yandex.ru

687.586.5

Background. The article considers a topical issue of creating optical fiber sensors of electric current (FSEC). FSEC compared with other current sensors have several advantages, which causes them considerable practical interest and provide their application. Object of research are FSEC on the basis of crystals with cubic symmetry Bi12SiO20 and Bi12GeO20. The subject of research is the metrological characteristics of such FSEC. The aim of this work is the analysis of metrological characteristics from the point of view of minimizing sensor errors and develop recommendations for their reduction.
Materials and methods. Consistently examined the structural and functional scheme of the single-pass FSEC on crystals with cubic symmetry Bi12SiO20 and Bi12GeO20, as well as its measurement model. Such metrological model developed on the basis of outside FSEC functional elements, the manufacturing errors of individual elemutual influence of all the above, allowed us to propose and analyze a real function of converting FSEC.
Results. Metrological analysis showed that the measurement result is affected by several factors, which manifest themselves in the form of additive and multiplicative errors. However, the factors related to imperfect manufacturing techniques, FSEC as a rule, can be taken into account when interpreting the results of measurements or minimized by the use of special design-technological methods in the design and manufacture of FSEC. The most significant largest error, which is quite difficult to resolve, is the additional temperature error from the influence of external temperature.
Conclusions. Based on metrological analysis a way to implement FSEC with the lowest possible for this type of sensor measurement noise. Indicated that the largest contribution to the total measurement error introduces additional temperature error from the influence of external temperature. Proposed techniques for its reduction.

electric current, fiber optic sensor, structural diagram, a functional diagram, measurement model, measurement error.