Performance Analysis And Optimum Method Of Rotary Optical Electric Field Sensor

With the change of power system operating environment and the improvement of voltage level,the traditional voltage sensor has exposed more and more problems.Due to the development of optical fiber technology and photoelectric technology,the voltage sensor based on optical principle has been developed rapidly,but its accuracy is easily affected by the environment and its inherent defects are not widely used in power system.Based on the transverse modulation structure of the optical electric field sensor,an improved rotating optical electric field sensor is designed.Firstly,the sensing mechanism of the optical electric field sensor is analyzed indetail and the mathematical model is established.This paper studies the mechanism of Pockels linear electro-optic effect,deduces the ellipsoid model of refractive index and Jones matrix calculation model,and analyzes the mathematical model of rotating optical electric field sensor based on BGO crystal,which lays a theoretical foundation for the follow-up research.Secondly,the performance of the rotating optical electric field sensor is analyzed,including the selection of the main optical elements and photodetectors.The optical fiber collimator is studied and the error of the sensor is analyzed.The effects of temperature and external stress factors on the experimental results are introduced.Then,based on the given mathematical model of the rotating sensor,the electro-optic crystal simulation model and the sensor element simulation model of the sensor are established,and the simulation is carried out from the two aspects of wave optics and ray optics through the COMSOL finite element simulation software.Finally,the change of the polarization state between the output light signal and the initial signal during the rotation of the crystal is studied.Finally,based on the theoretical and simulation results of the rotating optical electric field sensor,the rotating speed sensor is introduced to improve the experimental accuracy,the experimental platform is designed and optimized,the extended Kalman signal processing is compiled,and the measurement accuracy and stability of the equipment are verified by the experiment.