A gas-sensing optical fiber sensor for judging the deterioration degree of insulating materials in gis

Abstract

The patent of the present invention provides a gas-sensitive optical fiber sensor for judging the deterioration degree of insulating materials in GIS, which consists of a broadband light source, a polarizer, a test gas chamber, a D-type photonic crystal fiber, a single-mode fiber, a spectrum analyzer and a computer; The photonic crystal fiber is located in a test gas chamber, and the test gas chamber has an inlet and an outlet for controlling carbon tetrafluoride gas; the side polished surface of the D-type photonic crystal fiber is coated with a platinum composite graphene film, and the single-mode fiber spliced ​​with the D-type photonic crystal fiber The D-type photonic crystal fiber coated with the platinum composite graphene film together constitutes the probe of the gas-sensitive optical fiber sensor for judging the deterioration degree of the insulating material in the GIS. Using the SPR sensing mechanism, the small change in the refractive index RI of carbon tetrafluoride gas is converted into a measurable loss peak change, and the refractive index sensing is realized. It has the advantages of high sensitivity, flexible design, compact structure and strong stability. It has a wide range of application value in judging the degree of deterioration of insulating materials.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a gas-sensitive optical fiber sensor for judging the deterioration degree of insulating materials in a GIS. Background technique [0002] Gas Insulated Switchgear (GIS) has been widely used in power system due to its advantages of good stability and high reliability. However, GIS equipment will inevitably have various internal insulation defects due to installation, maintenance and long-term operation. These insulation defects may lead to insulation failure of GIS equipment during long-term operation, resulting in partial discharge. The degree of discharge can be analyzed to judge the insulation condition of the equipment. However, in the traditional partial discharge detection methods, such as pulse current method, ultrasonic method, ultra-high frequency method, etc., all have corresponding characteristics and advantages, but they cannot get rid of the...

AI Technical Summary

Problems solved by technology

However, at present, there are few detection methods for carbon tetrafluoride, and they are relatively traditional, with low sensitivity, poor stability, and susceptibility to external interference.

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