Ultra-sensitive SF6 gas decomposition component detection method based on broadband dual-optical comb spectrum

Abstract

The invention provides an ultra-sensitive SF6 gas decomposition component detection system based on a broadband double-optical-comb spectrum. The ultra-sensitive SF6 gas decomposition component detection system comprises two optical combs, a beam combiner, an enhanced gas sample pool, a lens, a hollow optical fiber, a microphone, an audio amplifier and a data acquisition card. The invention discloses an ultra-sensitive SF6 gas decomposition component detection method based on a broadband double-optical comb spectrum. According to the system and method, the simultaneous measurement of a plurality of molecular absorption peaks can be realized through a double-optical comb beat frequency modulation mode on the basis of the characteristic of optical comb wide spectrum coverage, and the problem of point-by-point sweep frequency spectrum measurement of a traditional photoacoustic spectrum is solved; a photoacoustic effect and a hollow-core optical fiber are combined, so that the effective optical path and the action cross section of the interaction of light and molecules are increased, and the problem of low sensitivity of the traditional spectrum detection technology is solved; the method and system can be applied to SF6 gas decomposition component detection, and the detection capability of a power equipment fault gas detection device on complex multi-component gas can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and specifically refers to an ultra-sensitive SF based on broadband double-comb spectrum 6 Gas decomposition component detection system and method. Background technique [0002] GIS (totally enclosed gas combined electrical appliances), open switches, transformers, etc. SF 6 (Sulfur hexafluoride) gas-insulated equipment has been widely used in power systems due to its small footprint and high reliability. Since all components are enclosed in metal shells, early failures are more difficult to find than conventional equipment. Even if the equipment is disassembled for maintenance, due to the complex process of the equipment, the maintenance work is difficult and time-consuming, so the loss caused by the failure is also greater. Monitoring the internal status of GIS and other equipment to avoid accidents has always been a research hotspot of scientific research institutions at home and abroa...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that due to the low coherence and stability of the infrared light source, the detection accuracy is low, the resolution is low, and the repeatability is poor.

However, due to the complex components and different contents of the characteristic gases of electrical equipment faults, strict requirements are placed on the characteristics of gas detection technology such as gas identification or resolution (selectivity), sensitivity, accuracy, and detectable gas types.

[0011] The existing non-contact gas detection technology more or less has the problems of low spectral precision and accuracy, limited detection sensitivity, difficult quantitative analysis and limited information collection.

The above problems largely restrict the accuracy of current gas detection and the real-time and reliability of power transmission and transformation equipment evaluation

Images