SF6 gas leakage detection method base on fractional laser-induced breakdown spectroscopy

A technology of gas leakage and fractional laser, which is applied in the direction of detecting the appearance of fluid at the leakage point, using liquid/vacuum degree for liquid tightness measurement, material excitation analysis, etc., can solve the problems that cannot be monitored in real time online, and achieve coverage The effect of wide range, improving real-time performance and eliminating misjudgment

Active Publication Date: 2014-12-10
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0005] The object of the present invention is, aiming at the problems existing in the current method, the present invention provides a kind of analysi...

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  • SF6 gas leakage detection method base on fractional laser-induced breakdown spectroscopy
  • SF6 gas leakage detection method base on fractional laser-induced breakdown spectroscopy

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Embodiment Construction

[0022] The specific embodiment of the present invention is as figure 1 with 2 shown.

[0023] SF to be monitored 6 Electric equipment 9 contains SF 6 (sulfur hexafluoride) gas, which plays the role of insulation and arc extinguishing. When SF 6 When electrical equipment 9 is normal, there is no SF 6 gas leak; when SF 6 Power Equipment 9 in SF 6 There are sand holes, cracks or gasket aging in the gas chamber tank and welds, which lead to SF 6 When the gas 7 leaks out, there will be a certain concentration of SF in the monitoring area 8 6 gas.

[0024] This embodiment is carried out like this:

[0025] SF 6 The fractional laser-induced breakdown spectroscopy detection system for gas leakage consists of a host computer 18, a high-energy pulse laser 1, a beam expander 3, a focusing lens array 5, a beam splitter 6, a photodetector array 10, a drive amplification output circuit 11, and an AOTF Filter 12, AOTF drive controller 13, and lens 19 are composed. The focusing l...

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Abstract

The invention discloses an SF6 gas leakage detection method base on fractional laser-induced breakdown spectroscopy. The method employs a system which comprises an embedded system mainframe (18), a high-energy pulse laser (1), a beam expander (3), a focusing lens array (5), a beam splitter (6), a photoelectric detector array (10), a drive amplification output circuit (11), an acousto-optic tunable filter (12), an AOTF (acousto-optic tunable filter) drive controller (13) and a lens (19). Multiple points of a monitored area are subjected to LIBS (laser-induced breakdown spectroscopy) signal real-time analysis of elemental sulphur and elemental fluorine according to the fractional LIBS technology so as to judge whether SF6 gas is leaked or not and approximate concentration distribution of SF6 gas leakage. The SF6 gas leakage detection method base on fractional laser-induced breakdown spectroscopy has the advantages that fractional LIBS measurement is higher in efficiency than single-point measurement; the AOTF is adopted for two wavelength selections in LIBS analysis, a conventional spectrograph for beam splitting and spectral analysis is not needed, and accordingly analysis time is saved, and timeliness is improved; approximate concentration distribution of SF6 gas leakage can be analyzed while whether SF6 gas is leaked or not is judged.

Description

technical field [0001] The invention relates to a power equipment SF 6 The invention discloses a lattice laser-induced breakdown spectroscopy (Laser-induced breakdown spectroscopy, LIBS for short) monitoring method for (sulfur tetrafluoride) gas leakage, which belongs to the technical field of laser spectrum measurement. Background technique [0002] SF 6 Gas (that is, sulfur tetrafluoride gas) has a history of one hundred years. It is an artificial inert gas synthesized by two French chemists, Moissan and Lebeau in 1900. SF 6 The gas was first used in the military field, and later began to be used commercially. Current SF 6 The gas is mainly used in the electric power industry, and mainly plays the role of insulation and / or arc extinguishing in high-voltage electrical equipment. Common use of SF 6 Gas power equipment includes: SF 6 Circuit breakers and GIS (here refers to sulfur hexafluoride closed combination electrical appliances, known internationally as "gas insu...

Claims

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Application Information

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IPC IPC(8): G01M3/04G01N21/63
Inventor 万雄
Owner STATE GRID CORP OF CHINA
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