State monitoring device for optical fiber current sensor

Abstract

The invention discloses a state monitoring device for an optical fiber current sensor. The state monitoring device comprises a first optical fiber coupler, a second optical fiber coupler, a first photoelectric detector, a polarization state analysis module, a spectrum demodulation module and a signal processing unit; the first optical fiber coupler splits received light signals output by the lightsource and sends the split light signals to the second optical fiber coupler and the optical fiber current sensor to be measured; the first optical fiber coupler splits the received returned opticalsignal and sends the split optical signal to a to-be-detected optical fiber current sensor and the first photoelectric detector; the second optical fiber coupler splits received light signals output by the light source and sends the split light signals to the spectrum demodulation module and the polarization state analysis module respectively; and the signal processing unit receives output signalsof the first photoelectric detector, the polarization state analysis module and the spectrum demodulation module, and calculates state parameters of the to-be-detected optical fiber current sensor. According to the invention, various state parameters of the optical fiber current sensor can be extracted, and the reliability of an optical fiber current sensing system is improved.

Description

technical field [0001] The invention belongs to the technical field of equipment state monitoring, and in particular relates to a state monitoring device for an optical fiber current sensor. Background technique [0002] Current is a common and important measurement parameter in the industrial production process. Therefore, current measurement is widely used in power transmission, metallurgy, military, scientific research and other industries. All-fiber current transformer is a passive current transformer based on Faraday's magneto-optical effect principle. It has the advantages of small size, light weight, simple insulation structure, and large dynamic range of measurement. It has been widely used in DC transmission projects. . However, in actual operation, all-fiber current transformers are easily affected by various factors such as temperature, vibration, interference, and optical path loss, especially photoelectric components such as light sources, optical fibers, and p...

AI Technical Summary

Problems solved by technology

For example, the bending of the optical fiber circuit by external force, the presence of air bubbles in the optical fiber, contamination or even breakage, etc., will cause the light intensity of the optical circuit to decrease or even disappear; and the transient interference signals generated by the operation of switching equipment or flashover in the station Will directly affect the modulation circuit of the all-fiber current transformer

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