A broadband Faraday fiber-optic current sensor with excess noise compensation

被引：8
|
作者：
Gubin, V. P. [1 ]
Przhiyalkovskiy, Y., V [1 ]
Starostin, N., I [1 ]
Morshnev, S. K. [1 ]
Sazonov, A., I [1 ]
机构：
[1] Russian Acad Sci, Fryazino Branch, Kotelnikov Inst Radio Engn & Elect, Fryazino 141190, Moscow Region, Russia
来源：
RESULTS IN PHYSICS | 2020年 / 18卷
关键词：
Faraday effect; Fiber-optic current sensor; Excess noise; GYROSCOPE; SUPPRESSION;
D O I：
10.1016/j.rinp.2020.103286
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A Faraday fiber-optic current sensor with suppression of excess noise produced by a low-coherent light source is presented. The sensor is designed to detect short current pulses and represents an in-line interferometer with a sensing element based on a spun highly birefringent fiber. To suppress the excess noise, a two-channel light detection scheme without an additional delay line is applied. It is established that bending birefringence induced in the spun fiber wound on a coil limits the noise suppression. To minimize this effect, a new geometry of the sensing coil is used. The proposed sensor exhibits a 5-fold improvement of the signal-to-noise ratio and the same enhancement of the sensitivity to a value of 0.8A in the 3.5 MHz bandwidth. The minimum duration of the measured current pulse is 200 ns.
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页数：4
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