反射式Sagnac型光纤宽带大电流测量仪的研制与性能评估  

Development and Performance Evaluation of Reflective Sagnac Optical Fiber Broadband High Current Measuring Instrument

作　　者：谢小军 朱才溢 李庆先 李华 罗颖 XIE Xiao-jun;ZHU Cai-yi;LI Qing-xian;LI Hua;LUO Ying(Hunan Institute of Metrology,Changsha,Hunan 410014,China)

机构地区：[1]湖南省计量检测研究院,湖南长沙410014

出　　处：《计量学报》2020年第8期989-996,共8页Acta Metrologica Sinica

基　　金：国家重点研发计划重大科学仪器设备开发专项(2016YFF0102406)。

摘　　要：为解决大型装备电焊和电镀装置的大电流量值传递及在线校准的难题,研制了一种反射式Sagnac型光纤电流互感器样机(光纤宽带大电流测量仪)。采用了线性双折射抑制、温敏变比自补偿、数字闭环信号检测等关键技术,对柔性光纤敏感头进行了优化设计。对样机进行了主要技术性能验证测试,试验结果表明,在所述试验条件下的测量准确度优于±0.2%,温度、振动、磁场变化下变比误差皆小于±0.2%,频率响应1 kHz衰减0.14%,-3d B带宽大于10 kHz,验证了测量仪的可靠性及在线校准大电流的适用性。样机测量结果的相对扩展不确定度为0.10%,测量仪的精度等级达到了0.2级。To deal with the difficulties of quantity transfer and on-line high current calibration for large-scale electric welding and electroplating,a prototype of reflective Sagnac fiber-optic current transformer(RS-FOCT),named fiber broadband high current measuring instrument,was developed and proposed.The prototype utilized the techniques including the linear birefringence suppression,the retarder temperature self-compensation,the closed-loop digital signal detection,and meanwhile implemented optimization design like flexible fiber sensing coil.Several key technical features were tested.The test results showed that the measurement accuracy of the developed prototype is superior to±0.2%under the experimental condition,the scale factor errors under the changes caused by the temperature,vibration and magnetic field variation,are all less than±0.2%.Frequency response at 1 k Hz is attenuated by 0.14%,and the-3 d B bandwidth is wider than 10 k Hz.The accuracy reliability and serviceability in high current online calibration of the measuring instrument were verified.The model’s extended uncertainty of measurement error is 0.10%,the accuracy grade of the measuring instrument is in accordance with 0.2 grade.

关 键 词：计量学 大电流测量仪 光纤电流互感器 在线校准 变比误差 不确定度 

分 类 号：TB971[一般工业技术—计量学]