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Temperature drift, stress birefringence and low frequency vibration lead tothe randomness and fluctuation of the output of optical voltage sensor(OVS). Inorder to solve the problem, this study adopts the lock-in amplifier technologywith the aid of a high-speed rotating electrode to realize electric fieldmodulation. This technology could shift the measured signal frequency band fromnear 50 Hz moved to several kilometer Hz, so as to make the output signal avoidthe interference from low-frequency temperature drift, stress birefringence andvibration, leading to higher stability and reliability. The electro-opticcoupling wave theory and static electric field finite element method areutilized to investigate the shape of modulation wave. The simulation resultsproves that lock-in technology is able to prevent the measured voltage signalfrom the large step signal interference and restore the perfect originalsignal. While the sample rate is decreased to the value of the modulationfrequency.

Design of optical voltage sensor based on electric field regulation and rotating isomerism electrode