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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摘要非线性误差是干涉型数字闭环光纤电流传感器超大电流测量的主要误差源之一。借助琼斯矩阵方法,推导了光纤1/4波片不理想条件下传感器输出与被测电流的理论关系,确定了1/4波片的方位角和相位延迟误差是造成光纤电流传感器超大电流测量非线性的主要原因之一。仿真结果表明:在5~300kA范围内,方位角误差小于4.53°,相位延迟误差小于9.05°,可保证传感器的测量误差小于0.2%。搭建了光纤直流大电流传感器校准系统,提出了分段线性插值补偿方法校准光纤电流传感器的非线性误差。测试结果表明:非线性补偿后传感器的测量误差由最大的0.6%降低到0.1%以内,证明了非线性补偿方法的有效性。

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	李奇
	李传生
	梁波
	蔡晋辉
	邵海明
	梅国健

关键词 ：计量学, 大电流测量, 光纤电流传感器, 非线性误差, 校准, 1/4波片

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

收稿日期: 2019-05-27 发布日期: 2021-04-20

PACS:

TB971

基金资助:国家重点研发计划重大科学仪器设备开发专项(2016YFF0102401, 2016YFF0102404)

通讯作者: 李传生(1984-),黑龙江鹤岗人,中国计量科学研究院副研究员,主要从事光纤电流传感技术、宽带大电流计量技术方面的研究。Email: lichsh@nim.ac.cn E-mail: lichsh@nim.ac.cn

作者简介: 李奇(1994-),内蒙古呼和浩特人,中国计量大学硕士研究生,主要研究方向为光纤电流传感技术及应用。Email: liqi605@qq.com

引用本文:

李奇,李传生,梁波,蔡晋辉,邵海明,梅国健. 光纤直流大电流传感器非线性机理及校准技术[J]. 计量学报, 2021, 42(4): 409-414.
LI Qi,LI Chuan-sheng,LIANG Bo,CAI Jin-hui,SHAO Hai-ming,MEI Guo-jian. Nonlinear Mechanism and Calibration Technology ofFiber-Optic DC High Current Sensor. Acta Metrologica Sinica, 2021, 42(4): 409-414.

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