基于水热法生长的硅酸铋晶体光学电压传感器  

Optical voltage sensor using bismuth silicate crystal grown by hydrothermal method

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：《光电子．激光》2014年第2期239-245,共7页Journal of Optoelectronics·Laser

摘　　要：提出一种基于水热法生长的硅酸铋（BSO,Bi12SiO20）晶体型光学电压传感器,其 电压传感单元主要包括一块BSO晶体和两个偏振器,不需要附加1/4波片。实验结果表明 ,所用BSO晶体样品 具有显著的线性电光效应,可以用于测量交流电压；通过合理利用BSO晶体自身自然旋光性,可以使其电 压单调及线性测量范围均大于以往基于无自然旋光性晶体的电压传感器。实验所用BSO 晶体的自然旋光角度约为132°。实验数据表明,在电光相位延迟的 峰-峰值为2π范围以内, 传感器输出电压仍然能够随被测电压单调地变化。在被测工频电压有效值为108～1300V范围内,实验测量了传感器输出电压随被测电压变化的非 线性响应特性； 在利用应力双折射产生的相位延迟提供光学偏置的条件下,在一定电压范围内,可以实现工 频交流电压的线性测量,相应的电压测量灵敏度约为0.027mV/V,非线性误差小于3.1%。An optical voltage sensor is proposed which uses one single bismuth si licate （Bi12SiO20, BSO） crystal grown by hydrothermal method.The voltage sensing unit is only comp osed of one block of BSO crystal and two prism polarizers.Experimental results demonstrate th at the used BSO crystal sample exhibits obvious linear electro-optic Pockels effect,and can be used for the measurement of alternating voltage.By use of the inherent natural optical activity in the B SO crystal, monotonous and linear voltage measurement ranges of the proposed voltage sensor are larger than those of the conventional voltage sensors using electro-optic crystals without optical activity. The size of the used BSO crystal sample is 6.0mm×4.0mm×2.9mm3.The angle, through which the plane-of-vibration rotates in the BSO crystal due to its optical activity,is a bout 132° for light wavelength of 633nm.The measurand voltage is the alternating voltage with indu strial frequency of 50Hz,and is monotonously and nonlinearly measured in the range of 108-1300V （root-mean-square amplitude）.The output voltage of the sensor is still monotonously changed with measured voltage when the corresponding electro-optic phase retardation reache s 2π.In addition,under the application of a proper stress-induced birefringence in the BSO crystal,the ou tput voltage is linearly changed with measured voltage in a certain voltage range,e.g.,900V,c orresponding voltage measurement sensitivity is 0.0276mV/V and nonlinear error is less than 3.1%.

关 键 词：光学电压传感器 电光调制 光学相位偏置 自然旋光性 硅酸铋(BSO)晶体 

分 类 号：O436.4[机械工程—光学工程] O734.1[理学—光学]