Laser Raman gas detection device based on concentric cavity mirror
A Raman gas and detection device technology, applied in measurement devices, Raman scattering, material excitation analysis, etc., can solve problems such as high maintenance costs and inability to continuously detect, and achieve high reliability, excellent detection effect, and compact system. Effect
Inactive Publication Date: 2018-06-26
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
Traditional detection methods, such as gas chromatography technology, have problems of continuous detection and high maintenance costs, while infrared spectroscopy technology, with its limited detection range, can only be used in corresponding environments
Method used
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[0010] Such as figure 1 The structure diagram of a laser Raman gas detection device based on concentric cavity mirrors is shown. 101 and 102 are mirrors; 201 is a triangular prism; 301 is a high-pressure helium-neon tube with Brewster windows at both ends; 401 is a gas chamber; 501 is a spectrometer Modules; 601 and 602 are inlet and outlet trachea; 701 and 702 are concave mirrors. The laser is generated by using an active resonator. The mirror 101, the prism 201, the high-pressure helium-neon tube 301, and the laser output from the high-pressure helium-neon tube 301 pass through the prism 201 to the mirror 101 on the vertical optical path. After reflection, it passes through the prism 201 and the high-pressure helium-neon tube 301 to enter the gas chamber 401 from the vertical window on one side of the gas chamber 401. The incoming laser light is repeatedly refracted between the two concave mirrors 701 and 702, and then from the other side of the gas chamber 401 The window is...
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Abstract
The invention relates to a laser Raman gas detection device based on a concentric endoscope. A first reflecting mirror, a triple prism and a high-pressure helium neon tube are coaxially placed on an optical path outside a gas chamber in sequence, laser output by the high-pressure helium neon tube reaches the reflecting mirror perpendicular to the light path through the triple prism, the laser passes through the triple prism and the high-pressure helium neon tube after being reflected and perpendicularly comes in the gas chamber from a window in one side of the gas chamber, the laser entering the gas chamber is repeatedly refracted between two concave mirrors with focuses concentric and then goes out of the gas chamber from a window in the other side of the gas chamber to a second reflecting mirror over against an opening of the gas chamber, and the laser is reflected into the gas chamber through the second reflecting mirror and then enters the portion between the two concave mirrors to be refracted repeatedly. Multi-way gas enters the gas chamber from a gas inlet of the gas chamber and reacts with laser to generate Raman signals, mixed light is collected through a spectrograph module on the gas chamber, and signals processed by the spectrograph module are sent to a computer to generate Raman spectrograms. The light intensity is improved by adopting the concentric endoscope. Multiple kinds of gas can be measured online at the same time.
Description
Technical field [0001] The invention relates to a gas detection method, in particular to a laser Raman gas detection device based on a concentric cavity mirror. Background technique [0002] There are a large number 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 and gas mixture is the key to oil and gas exploitation. The purpose of gas detection is mainly the following three points: one is to directly discover oil and gas reservoirs; the second is to do a good job of monitoring and early warning of toxic and harmful gases; the third is to discover non-hydrocarbon gas deposits. Traditional detection methods, such as gas chromatography technology, have the problems of not being able to perform continuous detection and high maintenance costs. Infrared spectroscopy technology and limited detection range make it only applicable to the corresponding environment. Therefore, an effective ...
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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张雷洪严永鹏黄元申张大伟
Owner UNIV OF SHANGHAI FOR SCI & TECH