基于电子剪切散斑干涉技术的光学电流互感器

基于Faraday磁光效应的光学电流互感器的研制和试运行表明,光学电流互感器的应用能产生一定的经济效益和社会效益.作为对其应用范围的补充,提出基于电子剪切散斑干涉方法的光学电流互感器,并设计相应的磁场力敏感传感器,其原理是待测电流的磁场力作用于传感器使之变形,用电荷耦合器件记录传感器的变形图像,对图像进行处理得到待测电流的磁场力或电流大小.实验室的可重复性和抗干扰性实验表明,所设计的光学电流互感器可用于现场使用.

An Optical Current Transducer Based on the Electronic Speckle-shearing Pattern Interferometer

The sustained development and trial operation of an optical current transducer based on the theory of Faraday magnetic-optic effect in power systems shows that the application of the optical current transducer has definite economic and social benefits.A new type of optical current transducer based on the electronic speckle-shearing pattern interferometer is presented in this paper and the design of the magnetic sensor is discussed.The magnetic force,which is generated by the to-be-measured current,makes the sensor deform,and the charge-coupled device(CCD)records the deformed image to obtain the value of the current by image data processing.Experiments on the repeatability and anti-interference capability in laboratory show the optical current transducer is useful in practice.