Research on high current nonlinear error characteristics of fiber optic current sensor

Jianguang Li; Hao Xiao; Dongwei Liu; Chuansheng Li; Fang Li; Yuliang Liu

doi:10.1117/12.2692278

18 December 2023 Research on high current nonlinear error characteristics of fiber optic current sensor

Jianguang Li, Hao Xiao, Dongwei Liu, Chuansheng Li, Fang Li, Yuliang Liu

Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 1296805 (2023) https://doi.org/10.1117/12.2692278
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

A model for calculating the scalar factor in an interferometric digital closed-loop fiber optic current sensor is derived when the fiber retarder and the sensing fiber are working in non-ideal conditions. The key parameters leading to high current nonlinear errors in fiber optic current sensors are proposed: the alignment angle of the retarder, the phase delay angle of the retarder, and the linear birefringence of sensing fiber. The nonlinear error model of the fiber optic current sensor in the measurement range of 1~1400kA under typical parameters is simulated. A fiber-optic DC high current sensor calibration system was built, and the test results showed that the ambient nonlinear error of the sensor in the range of 16~840kA was 1.2% when the alignment angle of the retarder was 45° and the phase delay angle of the retarder was 98°, which was consistent with the theoretical derivation. The measurement error of the sensor is reduced from 1.2% to 0.15% by compensating for the nonlinear error through 3rd -order polynomial fitting modeling.

Citation Download Citation

Jianguang Li, Hao Xiao, Dongwei Liu, Chuansheng Li, Fang Li, and Yuliang Liu "Research on high current nonlinear error characteristics of fiber optic current sensor", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 1296805 (18 December 2023); https://doi.org/10.1117/12.2692278

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KEYWORDS

Fiber optics sensors

Wave plates

Birefringence

Fiber optics

Nonlinear optics

Sensors

Error analysis

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