Novel high-sensitivity spectrum detection device for detecting GIS characteristic gas

Abstract

The invention relates to the electrical field, in particular to a novel high-sensitivity spectrum detection device for detecting GIS characteristic gas. The novel high-sensitivity spectrum detection device comprises a high-power narrow-linewidth optical parametric oscillator assembly, an intermediate light path and dispersion unit assembly and a signal monitoring assembly, wherein the high-power narrow-linewidth optical parametric oscillator assembly is arranged in a case, and comprises an optical fiber amplifier, a beam expander, a focusing lens, a ring cavity lens, an F-P etalon, an opticalparametric oscillator and a pump laser source; the intermediate light path and dispersion unit assembly comprises a dichroscope, a beam splitter, a wavelength meter, two reflectors, two gold-plated mirrors, two silver-plated mirrors and a dispersion prism; and the dispersion prism can be specifically implemented as an equilateral dispersion prism; and the signal monitoring assembly comprises a gaspool and a photoacoustic analyzer, and the photoacoustic analyzer is placed in the gas pool.

Description

technical field [0001] This application relates to the electrical field, in particular, to a novel high-sensitivity spectral detection device for detecting GIS characteristic gases. Background technique [0002] GIS equipment, that is, sulfur hexafluoride closed combined electrical appliances, was born in the mid-1960s. It uses primary equipment in a substation other than transformers, including circuit breakers, disconnectors, fast (grounding) switches, current transformers, Potential transformers, lightning arresters, busbars (three-phase or single-phase), connecting pipes, transition elements and cable terminals are all combined in a fully enclosed metal shell through optimized design, and the medium used for insulation and arc extinguishing in the shell is 0.4 ~0.6MPa SF6 gas. [0003] For the detection of GIS fault characteristics, the existing sensing analysis methods mainly include: gas chromatography, mass spectrometry, semiconductor (carbon nanotube) gas sensor, an...

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Problems solved by technology

[0005] This application provides a new type of high-sensitivity spectral detection device for detecting GIS characteristic gases, through this special characteristic of zero background in the wavelength modulation configuration of photoacoustic spectroscopy, a cantilever-enhanced type combined with high sensitivity is proposed The photoacoustic detector, through the stable high-power narrow-linewidth mid-infrared continuous wave optical parametric oscillator and the strong absorption cross-section of hydrogen fluoride, makes the signal change linearly with the absorbed laser power, while achieving the required sensitivity. The impact of other gases other than the gas to be measured, and the long-term stability is guaranteed, to a certain extent, it can solve the problems of gas cross-interference, easy aging, and poor stability in the current GIS fault characteristic gas detection device

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