利用单块硅酸铋晶体同时测量交流电压和电流  

Simultaneous measurement of alternating voltage and current using single bismuth silicate crystal

作　　者：李长胜[1] 曾张 何小玲[2] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191 [2]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《红外与激光工程》2014年第9期3036-3041,共6页Infrared and Laser Engineering

基　　金：广西省自然科学基金(2013GXNSFBB053004)

摘　　要：设计并实验实现了利用单块硅酸铋(Bi12SiO20,BSO)晶体同时测量交流电压和电流的传感方案,其光学传感单元仅由起偏器、BSO晶体和检偏器组成。BSO晶体兼有Pockels电光效应和Faraday磁光效应,在起偏器和检偏器的主透光方向互相平行或互相垂直的情况下,输出光信号中同时包含被测电压和电流传感信号,其中电压传感信号为被测电压的倍频信号,而电流传感信号则与被测电流同频率,因而可以利用电子滤波器从光电检测信号中分离出电压与电流传感信号,从而实现电压和电流的同时测量。利用一块尺寸为6.0×4.0×2.9mm3的BSO晶体,实验实现了6A、200V范围内工频电流与电压的同时测量。A novel optical sensor for simultaneous measurement of voltage and current is proposed and demonstrated in experiment. The optical sensing unit is only composed of single bismuth silicate （Bi12SiO20, BSO） crystal and two prism polarizers. The BSO crystal exhibits both Pockels electrooptic effect and Faraday magnetooptic effect, thus voltage and current to be measured can simultaneously modulate the probing light wave when transparent axes of the two polarizers are parallel or perpendicular with each other. The frequency of current sensing signal is the same as that of the original current to be measured, meanwhile, that of voltage sensing signal is doubled. Thus current and voltage sensing signals can be simultaneously separated and measured by using two band pass filters. AC current and voltage with industrial frequency in the ranges of 6 A and 200 V were simultaneously measured in experiment by use of single BSO crystal with a size of 6.0×4.0×2.9 mm3.

关 键 词：光学传感器 电压和电流同时测量 电光效应 磁光效应 硅酸铋晶体 

分 类 号：O436.4[机械工程—光学工程] TM930.126[理学—光学]