光纤直流大电流传感器非线性机理及校准技术

doi:10.3969/j.issn.1000-1158.2021.04.02

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Abstract Nonlinear error is one of the main error sources for the ultra-large current measurement of the interferometric-type digital closed-loop fiber-optic current sensor (FOCS). Based on the Jones matrix method, the theoretical relationship between the sensor output and the current to be measured is derived under the condition of the imperfect fiber quarter-wave retarder. It is determined that the azimuth mismatch and phase retardation error of the quarter-wave retarder are both the main causes of the measurement non-linearity for the FOCS. The simulation results show that if the azimuth mismatch and the phase retardation error are kept within ±4.53° and ±9.05°, respectively, the measurement error of the sensor will be less than 0.2% for the current to be measured from 5 kA to 300 kA. The calibration device for the FOCS is built, and the error compensation method based on the linear interpolation is proposed to calibrate the nonlinear error of the FOCS. The test results show that the measurement error of the sensor can be reduced from 0.6% to be within 0.1% by using the mentioned error compensation method, which proves the nonlinear error compensation method is effective.

Key words： metrology high current measurement Fiber-optic current sensor nonlinear error calibration quarter-wave retarder

Received: 27 May 2019 Published: 20 April 2021

PACS:

TB971

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	Articles by authors
	LI Qi
	LI Chuan-sheng
	LIANG Bo
	CAI Jin-hui
	SHAO Hai-ming
	MEI Guo-jian

Cite this article:

LI Qi,LI Chuan-sheng,LIANG Bo, et al. Nonlinear Mechanism and Calibration Technology ofFiber-Optic DC High Current Sensor[J]. Acta Metrologica Sinica, 2021, 42(4): 409-414.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2021.04.02 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2021/V42/I4/409

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