Optical fiber annular cavity gas concentration detection system and method adopting microstructure optical fiber
A gas detection system and microstructure optical fiber technology, which is applied in the field of spectral measurement, can solve the problems of the influence of gas fluctuations to be measured, and the detection accuracy of optical fiber ring cavity ring-down spectral measurement technology is not high enough.
Pending Publication Date: 2021-01-12
HUBEI UNIV OF TECH +1
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Problems solved by technology
[0004] The invention provides an optical fiber ring cavity ring down spectrum gas concentration detection system and method using a microstructure optical fiber to solve the problems that the gas to be measured is affected by the fluctuation of the light source, and the problem that the detection accuracy of the optical fiber ring cavity ring down spectrum measurement technology is not high enough
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[0035] figure 1 A structural block diagram of an optical fiber annular cavity gas concentration detection system using microstructured optical fibers provided by an embodiment of the present invention. Such as figure 1 , a fiber ring cavity ring-down spectrum gas detection system includes a laser 1, an electro-optic modulator 2, a signal generator 3, an isolator 4, a coupler 5, 8, a gas chamber 6, a transmission fiber 7, a photodetector 9, an oscilloscope 10.
[0036] The laser 1 can be a distributed semiconductor laser (with the advantages of light and small size, long normal working life, etc.), which is used as a light source in the detection system to emit infrared light in a specific wavelength range. The output wavelength linewidth of the laser 1 is relatively narrow, which is negligible relative to the linewidth (GHz) of the absorption spectrum of gas molecules.
[0037] The electro-optic modulator 2 can shape the input continuous laser light into pulsed laser light....
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The invention discloses an optical fiber annular cavity gas concentration detection system and a method adopting a microstructure optical fiber. An optical fiber loop of the system comprises a transmission optical fiber (7) and a microstructure optical fiber (14) which are connected with each other, closed buffer cavities (18) are formed in the joints of the two ends of the transmission optical fiber (7) and the two ends of the microstructure optical fiber (14), and one of the two buffer cavities (18) is provided with an air inlet (16) used for being connected with an air bag (19); and the other one of the two buffer cavities (18) is provided with an air outlet (17) used for being connected with a vacuum pump (20). The gas to be measured can exist in the pores of the micro-structure optical fiber (14) in a molecular form, the interaction between light and the gas to be measured is enhanced, meanwhile, higher excitation efficiency and smaller loss are achieved, and higher detection precision can be achieved compared with a traditional optical fiber ring cavity ring-down spectroscopy measurement system.
Description
technical field [0001] The invention relates to the field of spectrum measurement, in particular to an optical fiber ring cavity ring-down spectrum gas concentration detection system and method using a micro-fiber structure. Specifically, it can be used for SF in gas-insulated equipment in the electrical field 6 Wait for the insulating medium to decompose the gas for detection. Background technique [0002] During the long-term operation of gas-insulated combined electrical equipment, SF 6 Such as gas insulation medium in the case of partial discharge and overheating, will decompose, and because there is a small amount of H inside the equipment 2 O, O 2 and other impurities, SO will be generated after complex chemical reactions 2 , HF, CO and H 2 S and other decomposition products. Therefore, in the actual application process, the working status of the gas-insulated equipment can be judged by detecting the decomposition products of the gas-insulated medium, and the fau...
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IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/391
Inventor 张晓星田双双张引李晓涵王毅罗兵王婷婷
Owner HUBEI UNIV OF TECH