Design of Reciprocal Optical Path for Voltage Measurement Based on Pockels Effect

Voltage measurement of existing ships usually uses electrical intrusive voltage measurement methods. These methods have the problems of poor insulation and anti-interference ability, low response speed, and they can only be used for low-voltage voltage measurement. In order to fast and accurate voltage measurement, the article proposes a non intrusive measurement scheme based on optical principle, and designs a Sagnac interference reciprocity optical path based on Pockels effect. The scheme consists of voltage sensitive optical path, optical component, demodulation circuit, interface circuit and power supply circuit. It has the advantages of high signal sensitivity, large dynamic range, long-distance transmission and strong anti-interference ability. The experimental results show that the digital output of the sensor has a good linear relationship with the input voltage, which can prove that the reciprocity optical path structure has good sensing performance and good common mode rejection ability to a certain extent.