Gas concentration measuring instrument
A technology of gas concentration measurement and gas chamber, which is applied in the field of optical sensing, can solve the problems of difficult control of optical path, high processing precision and high cost, and achieve the effects of increasing detection sensitivity, convenient installation and debugging, and increasing signal-to-noise ratio
Inactive Publication Date: 2010-04-14
ZHEJIANG UNIV
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Problems solved by technology
However, the multi-reflection gas chamber requires high precision for processing, is expensive, and the total optical path is not easy to control
Method used
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[0016] like figure 1 As shown, a gas concentration measuring instrument includes a gas chamber 13 , a laser 8 , a detector 6 , an incident optical fiber collimator 14 , an outgoing optical fiber collimator 5 , a signal processor 7 and an exhaust gas treatment and recovery device 10 .
[0017] The air chamber 13 is a glass air chamber with a cylindrical fully enclosed structure, and its cross section is oval. The inner wall of the air chamber 13 is coated with a full reflection film. The gas cylinder 1 is connected with the gas cylinder 1, and a flow meter 2 and an inlet valve 3 are arranged on the inlet pipeline; the bottom cover of the air chamber 13 is provided with an air outlet, and the outlet is connected with the exhaust gas recovery device 10 through the outlet pipeline, and the outlet pipeline is provided with Outlet valve 12 and vacuum pump 11.
[0018] The total reflection film on the inner wall of the air chamber 13 is provided with an incident light-through window...
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The invention relates to a gas concentration measuring instrument. The traditional gas chamber has longer length or high required machining precision, expensive manufacturing cost and difficult control of an optical path. In the invention, a gas chamber is a glass gas chamber in a cylindrical totally-enclosed structure; a cross section of the gas chamber is elliptical; a total reflection film is plated on an inside wall of the gas chamber; a top cap and a bottom cap of the gas chamber are respectively provided with a gas inlet and a gas outlet; the total reflection film on the inside wall of the gas chamber is provided with an incident light passing window; an incident optical fiber collimator is arranged at a position corresponding to the incident light passing window; the incident optical fiber collimator is connected with a laser through an optical fiber; the total reflection film on the inside wall of the gas chamber is provided with an emergent light passing window; an emergent optical fiber collimator is arranged at a position corresponding to the emergent light passing window; an output end of the emergent optical fiber collimator is optically connected with an input end of a detector; an output end of the detector is connected with a signal processor; and the incident light passing window and the emergent light passing window are in the same horizontal elliptical cross section. The gas concentration measuring instrument has simple machining, low cost, high signal-to-noise ratio and high detection sensitivity.
Description
technical field [0001] The invention belongs to the technical field of optical sensing and relates to a gas concentration measuring instrument. Background technique [0002] Whether it is air pollution (such as NO, NO 2 , SO 2 etc.) or human health diagnosis (O 2 , CO 2 , CO, etc.), or mining security (CO, CH 4 etc.) are related to the measurement of gas content and presence or absence. In particular, the serious consequences of the destruction of the global ozone layer, the greenhouse effect, and photochemical smog brought about by modern industrialization have a profound impact on national development and human health. One of the proposed strategic objectives is to basically control environmental pollution and initially curb the trend of ecological deterioration, which is an earnest hope of the country for the scientific and technological community during the "Eleventh Five-Year Plan" period. In addition, through the analysis of gas samples in the lithosphere, hydros...
Claims
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IPC IPC(8): G01N21/25G01N21/05
Inventor 阎春生
Owner ZHEJIANG UNIV