High-precision resonant optical voltage sensor and detecting method

Abstract

The invention discloses a high-precision resonant optical voltage sensor and a detecting method and belongs to the technical field of optical voltage sensing. The optical voltage sensor comprises a narrow linewidth laser source, a Y waveguide, a BGO crystal, dual detectors and a signal detection circuit which are sequentially connected through polarization maintaining optical fibers. The front light transmitting surface and the rear light transmitting surface of the BGO crystal are coated with films to form a high-definition resonant cavity, and the Pockels effect is improved through multiple times of transmission of light in the resonant cavity. According to the detecting method of the optical voltage sensor, by means of a resonant light path for dual path tracking, the resonant frequency difference of the two beams of light is synchronously detected, interference caused by the temperature change of the two beams of light at the same moment is consistent, the interference variables of the two beams of light in the propagation process are offset, and the improved Pockels effect is reserved. The measuring precision, temperature stability and environment adaptability of the optical voltage sensor are improved, the contradiction of high precision of miniaturization of the voltage sensor is solved, light path devices are reduced, and the structure is simple and reliable.

Description

Technical field [0001] The invention belongs to the technical field of optical voltage sensors, and relates to a high-precision resonant optical voltage sensing and detection method. Background technique [0002] As the power system develops towards high voltage, large capacitance, and digitalization, the power system puts forward higher performance requirements for the power measurement system. As a voltage measurement device, traditional voltage sensors are becoming increasingly unsuitable for the development of power systems due to their inherent defects, which promotes the emergence and development of optical voltage sensors. [0003] The optical voltage sensor is a voltage measurement device that senses the voltage information to be measured by the change of the optical signal. The optical voltage sensor has been extensively researched and developed rapidly due to its small size, good insulation, safety and reliability and a series of advantages. [0004] As a high-voltage meas...

AI Technical Summary

Problems solved by technology

[0005] Traditional optical voltage sensors based on the Pockels effect usually use longer bismuth germanate (Bi 4 Ge 3 o 12 , BGO) crystal to ensure that the Pockels phase difference it is sensitive to is large enough, but the larger the crystal length, the more difficult it is to miniaturize the sensor; at the same time, as a sensitive device, the BGO crystal’s measurement accuracy is affected by the temperature stability of the crystal, even in some In the improved structure, the improvement effect is also limited, and the addition of optical devices in the improved structure also introduces new error factors, and does not completely eliminate the error caused by temperature

[0006] It can be seen that the existing voltage sensor based on the Pockels effect is difficult to take into account the high precision and miniaturization of the test system due to the restriction of the crystal length

At the same time, the error caused by the temperature of the sensor makes it difficult to guarantee the consistent stability of the voltage measurement performance

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