Closed-loop electric field detection system integrated with BGO crystal optical waveguide

Abstract

The invention discloses a closed-loop electric field detection system integrated with a BGO crystal optical waveguide. The system comprises a wide-spectrum light source super-radiation light emittingdiode, a three-port circulator, a polarizer, a phase modulator, a collimator, a Faraday rotator mirror, a BGO integrated optical waveguide electric field sensor, a photoelectric detector, a signal processing unit and a polarization maintaining optical fiber. The reflective asymmetric BGO crystal integrated optical waveguide structure is processed and manufactured by adopting a femtosecond laser technology, so that the volume of the BGO crystal electric field sensor based on the Pockels effect is reduced; a closed-loop detection system is adopted, through optical waveguide structure parameter design and square wave phase modulation, a static working point of the system is controlled at a linear part, the sensitivity of an electric field measurement system can be improved, and error phase difference caused by external environmental factors is eliminated; feedback phase difference is generated through step wave modulation, nonlinear errors of the system can be further reduced, and meanwhile the dynamic range of the system is enlarged.

Description

technical field [0001] The invention belongs to the technical field of electric field measurement, and in particular relates to a closed-loop electric field detection system integrating BGO crystal optical waveguide. Background technique [0002] Electric field measurement is of great significance in research fields such as high voltage, high power pulse, high energy physics, and electrostatic protection. Traditional active electric field sensors have the disadvantages of large volume, easy drift, and large electromagnetic interference. With the development of photoelectric technology, the research of optical electric field sensor has been paid attention to by people. Compared with the traditional active electric field sensor, it has the advantages of small size, high precision, high sensitivity, large linear dynamic range and wide frequency response. Sensors have broad application prospects and research value. [0003] The sensing principle of the optical electric field s...

AI Technical Summary

Problems solved by technology

The factors that affect the stability of the optical electric field sensor are mainly that the electro-optic crystal used in it has a certain natural birefringence and the stress birefringence introduced in the processing process. When affected by external factors such as temperature and stress, an additional phase difference will be generated, which will cause Measurement error

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