Method for improving measurement accuracy of fiber optic current sensor

Abstract

The invention relates to a method for improving the measurement accuracy of a fiber optic current sensor. First, sensor coils are classified according to characterization parameters of strain and linear birefringence of the sensor coils, and the relation between strain parameters [epsilon], linear birefringence parameters [sigma] and fiber optic current sensor current ratio errors [gamma] is further acquired. Then, the sensor coils with different characterization phenomena are processed through thermal aging and vibration aging, and optimal test parameters for aging treatment of sensor coils of each type are obtained. According to the method for improving the measurement accuracy of the fiber optic current sensor, the optimal test parameters for aging treatment of the sensor coils are obtained through an orthogonal test, so that stability of the sensor coils is realized, scaling factor performance of the sensor coils is improved, the sensor coils can reach a steady state, the accuracy of the fiber optic current sensor is improved, and engineering of the fiber optic current sensor is realized.

Description

technical field [0001] The invention relates to a method for improving the measurement accuracy of an optical fiber current sensor, belonging to the technical field of optical fiber current sensors. Background technique [0002] The fiber optic current sensor is an optical sensing device based on the magneto-optical Faraday effect with an all-fiber structure. Compared with the traditional electromagnetic current transformer, the fiber optic current sensor has good linearity, large dynamic range, strong anti-interference ability, Good insulation performance, no magnetic saturation, wide frequency band, small size, light weight and other advantages, these advantages make it have broad prospects in the measurement application of large current and high voltage. However, it is difficult to solve the problem that it is susceptible to interference, so that its accuracy is difficult to guarantee. In practical applications, external factors such as ambient temperature and vibration h...

AI Technical Summary

Problems solved by technology

The change of the stress of the sensitive coil will directly lead to the problem of the current ratio error of the fiber optic current sensor, so maintaining the stability of the stress change of the sensitive coil is an urgent problem to be solved

[0004] At present, the amplitude change is used to characterize the stress amplitude of the fiber ring, and the average value method is used to characterize the stress asymmetry of the fiber ring. These methods are likely to cause random errors caused by test point selection errors, instrument errors, accidental phenomena, etc.; In the processing, the method of random vibration is adopted. This method takes a long time to test and cannot quickly find the resonance point for stress removal.

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