Abstract：Traditional optical current transducer is based on Faraday Magneto-Optic effect and Malus law. Its light intensity detection mode has some defects of small dynamic measurement range, big temperature drift, and linear birefringence. This paper presents a new type of optical current transducer based on convergent polarized light interference. It converts Faraday rotation angle to interference fringe's displacement, and uses linear CCD camera to capture the image and calculate the displacement. Magneto-optical film is also used to reduce the impact of linear birefringence. The experiments show the new OCT is capable of measuring Faraday rotation angle up to ±64.51° with good linearity, and reduces the effects of linear birefringence and temperature drift.
李超, 林韩, 徐启峰. 线性测量法拉第旋转角的新型OCT设计[J]. 电工技术学报, 2015, 30(24): 46-54.
Li Chao, Lin Han, Xu Qifeng. New Design of OCT with Faraday Rotation Angle Linear Measurement. Transactions of China Electrotechnical Society, 2015, 30(24): 46-54.
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2015, Vol. 30 
