Spatial full-angle ultrasonic optical fiber Fabry-Perot sensor for monitoring partial discharge of liquid-solid composite insulated power equipment

Abstract

The invention discloses a spatial full-angle ultrasonic optical fiber Fabry-Perot sensor for monitoring partial discharge of liquid-solid composite insulated power equipment, relates to an ultrasonicoptical fiber Fabry-Perot sensor, and aims to solve the problem that a non-intrinsic optical fiber Fabry-Perot sensor cannot detect ultrasonic waves in multiple directions. The sensor comprises a basic supporting body, a planar optical fiber pigtail, a first 45-degree inclined angle pigtail, a second 45-degree inclined angle pigtail, a first sensing diaphragm, a second sensing diaphragm and a third sensing diaphragm; the plane end of the planar optical fiber pigtail and the third sensing diaphragm form an optical Fabry-Perot cavity; the 45-degree inclined surface of the first 45-degree inclined angle pigtail and the first sensing diaphragm form an optical Fabry-Perot cavity; and the 45-degree inclined surface of the second 45-degree inclined angle pigtail and the second sensing diaphragm form an optical Fabry-Perot cavity. According to the sensor, the ultrasonic signals in the six directions of a three-dimensional space can be detected at the same time, so that the partial discharge opportunity of the insulation of test equipment is increased, and the detection sensitivity is high. The sensor is suitable for monitoring of the partial discharge of the power equipment.

Description

technical field [0001] The invention relates to an ultrasonic optical fiber method-Perkin sensor. Background technique [0002] The extrinsic fiber-optic sensor used for ultrasonic detection of partial discharge in large power equipment has been studied for many years at home and abroad and has achieved many results. At present, the optical fiber method-Pur sensor used for partial discharge ultrasonic detection mostly adopts the method of placing the sensing diaphragm parallel to the end of the optical fiber; but according to the principle of elastic mechanics, the normal direction of the diaphragm and the direction of ultrasonic propagation can only be obtained on the same straight line. Best coupling efficiency, where the sensor has maximum sensitivity. Experimental research also proves that for ultrasonic signals of the same frequency and intensity, the detection signal intensity is the largest in the normal direction of the optical fiber method-Pur sensor diaphragm, whi...

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Problems solved by technology

[0004] In order to solve the problem that the existing extrinsic fiber-optic sensor with a clear detection direction cannot detect ultrasonic signals in multiple directions, the present invention uses a combination of a planar optical fiber pigtail and a 45-degree inclined pigtail to propose a method for Spatial full-angle ultrasonic fiber optic method for monitoring partial discharge of liquid-solid composite insulated power equipment-Percent sensor

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