Light intensity modulation type optical fiber voltage sensor

Abstract

The invention relates to a light intensity modulation type optical fiber voltage sensor. The sensor comprises a light source, a first connecting optical fiber, a piezoelectric crystal, an S-shaped conical microstructure optical fiber, a second connecting optical fiber, a photoelectric detector and a signal processing unit. The S-shaped conical microstructure optical fiber is longitudinally laid along the height direction of the piezoelectric crystal; and the S-shaped conical microstructure optical fiber is fixed at the position which is equidistant from the upper end and the lower end of the piezoelectric crystal, the light source, the first connecting optical fiber, the S-shaped conical microstructure optical fiber longitudinally laid on the piezoelectric crystal, the second connecting optical fiber and the photoelectric detector are in optical signal connection in sequence, and the photoelectric detector is in electric signal processing connection with the signal processing unit. The sensor is simple in structure, high in sensitivity, wide in application range and good in effect.

Description

technical field [0001] The invention relates to an optical fiber voltage sensor. Specifically, it is a light intensity modulation type optical fiber voltage sensor. Background technique [0002] Voltage measurement plays an extremely important role in the fields of electric energy metering, relay protection, overvoltage on-line monitoring, intelligent equipment control, power maintenance and other fields of power systems. A new type of voltage sensor based on physical quantity coupling and conversion—optical voltage sensor is a comprehensive application of optoelectronics. Compared with traditional transformers, it has high safety performance, good insulation performance, no magnetic saturation phenomenon, large dynamic range, and high measurement accuracy. Highlight the advantages. At present, the fiber optic voltage sensor that has been studied more is based on the phase modulation inverse piezoelectric voltage sensor, which does not have discrete optical components such ...

AI Technical Summary

Problems solved by technology

However, the optical path structure of the phase modulation inverse piezoelectric fiber optic voltage sensor is still complicated, and it needs to connect optical fibers, circulators, polarizers, 45° fusion points, optical phase modulators, 45° Faraday rotators, piezoelectric crystals, and 90° fusion splices. Points, compensating optical fibers, mirrors, photodetectors and other optical components

Among them, the 45° and 90° welding points are very prone to systematic errors due to the deviation of the welding angle, and the rotation angle of the 45° Faraday rotator is very sensitive to temperature changes, which easily leads to inaccurate rotation angles and system errors

At the same time, the measurement principle of the phase modulation inverse piezoelectric fiber optic voltage sensor is complex, and the optical fiber needs to be fixed on the piezoelectric crystal by multi-layer winding. It is difficult to achieve uniform winding in the process and there is bending loss.

Based on the above, in order to solve the problems of the existing inverse piezoelectric optical fiber voltage sensors, which are prone to systematic errors, cumbersome structure, and complex process, etc., the present invention proposes a light intensity modulation optical fiber voltage sensor using S-tapered microstructured optical fiber as the sensitive unit.

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