Laser Raman gas detection system based on crossed closed light paths
A Raman gas and detection system technology, applied in Raman scattering, measurement devices, material excitation analysis, etc., can solve the problems of difficult to eliminate stray light, difficult to guarantee the laser intensity, etc., to achieve excellent detection effect, high reliability, Avoid the effect of loose structure
Active Publication Date: 2016-05-04
昆山上理工光电信息应用技术研究院有限公司
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Problems solved by technology
Sometimes not only the laser intensity is difficult to be guaranteed, but also the influence of stray light is difficult to eliminate
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[0013] Such as figure 1 Shown is a schematic diagram of a laser Raman gas detection system based on a crossed closed optical path. The reaction chamber 601 has inlet and outlet gas pipes 101 and 102 above and below; a spectrometer module 201 is placed above the reaction chamber 601 to collect signals in the reaction chamber 601; 301 and 302 are two ends with The high-pressure He-Ne glass tube of the Brewster window, two high-pressure He-Ne glass tubes are inserted into the reaction chamber obliquely and symmetrically, and are located on the same side; 401 is a prism; 501, 502, 503, and 504 are reflecting mirrors. The laser is generated by a high-pressure helium-neon tube, the reflector 501, the high-pressure helium-neon tube 301, the prism 401 and the reflector 502 are placed on the same axis in turn, the reflector 504, the high-pressure helium-neon tube 302 and the reflector 503 correspond to the reflector 501 , the high-pressure HeNe tube 301 and the reflector 502 are placed...
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Abstract
The invention relates to a laser Raman gas detection system based on crossed closed light paths. Two high-voltage helium-neon glass pipes are symmetrically and obliquely inserted in the same side of a reaction chamber. A first reflection mirror, the first high-voltage helium-neon glass pipe, a prism and a second reflection mirror are sequentially placed on the same axis. A fourth reflection mirror, the second high-voltage helium-neon glass pipe and a third reflection mirror are correspondingly symmetrical to the first reflection mirror, the first high-voltage helium-neon glass pipe and the second reflection mirror about the central horizontal line of the reaction chamber. Helium-neon lasers emitted out of the two high-voltage helium-neon glass pipes form the two closed crossed ring type light paths. Multiple paths of gas enter the reaction chamber from a gas inlet in the reaction chamber and react with the lasers to generate Raman signals, and mixed light is collected through a spectrograph module. According to the system, the active cavity enhancement technology and the Raman gas detection technology are combined, an active cavity is adopted, and structure looseness of a passive cavity is avoided; the crossed ring type light paths are adopted, and the influences of a single light path on returned light are reduced. Various types of gas can be measured online at the same time, and real-time online analysis can be conducted.
Description
technical field [0001] The invention relates to a gas detection method, in particular to a laser Raman gas detection method based on a cross-closed optical path. Background technique [0002] There are a lot of mixed gases in the exploitation of oil, natural gas and other energy sources. How to effectively detect and separate different gases in the oil-gas mixed gas is the key to oil and gas exploitation. Traditional detection methods, such as gas chromatography technology, have the problems of not being able to detect continuously and having high maintenance costs, while infrared spectroscopy technology, with its limited detection range, can only be used in corresponding environments. Therefore, it is of great significance to seek an effective gas detection method, which should be able to continuously and effectively distinguish a variety of gases, and have high precision, for the development of petrochemical industry. The application of Raman spectroscopy makes this possi...
Claims
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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 黄元申严永鹏张雷洪张大伟
Owner 昆山上理工光电信息应用技术研究院有限公司