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Device for measuring gas concentration

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 cost, high processing precision, etc., to increase signal-to-noise ratio and detection sensitivity, low cost, and simple installation and debugging Effect

Inactive Publication Date: 2010-01-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Device for measuring gas concentration
  • Device for measuring gas concentration
  • Device for measuring gas concentration

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Embodiment Construction

[0024] Such as figure 1 As shown, a device for gas concentration measurement includes a gas chamber 6 , a laser 8 , a detector 16 , an exhaust gas processor 11 , a signal processor 18 and a flow meter 3 .

[0025] The interior of the glass air chamber 6 with a cylindrical fully enclosed structure is hollow, forming an air chamber cavity 16. The inner wall of the air chamber 6 is coated with a layer of full reflection film. One end of the air pipe 1 is sealed and connected, and the other end of the air inlet pipe 1 is sealed and connected with the gas cylinder 5. The side of the air inlet pipe 1 close to the air inlet 4 is sequentially provided with an air inlet valve 2 and a flow meter 3; the bottom cover of the air chamber is provided with An air outlet 15, the air outlet 15 is sealingly connected with one end of the air outlet pipe 13, the other end of the air outlet pipe 13 is airtightly connected with the waste gas processor 11, and the side of the air outlet pipe 13 close...

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Abstract

The invention relates to a device for measuring gas concentration. The prior art has the defects of longer length or high processing precision requirement of a gas chamber, high manufacture cost and hardly controlled optical length. The device for measuring gas concentration comprises a gas chamber, a laser, a detector, a waste gas processor, a signal processor and a flowmeter, wherein a total-reflection film is coated on the inner side wall of the cylindrical glass gas chamber; a top cover of the gas chamber is provided with a gas inlet which is hermetically connected with a gas inlet pipe; the gas inlet pipe is sequentially provided with a gas inlet valve and the flowmeter; a bottom cover of the gas chamber is provided with a gas outlet which is hermetically connected with a gas output pipe; the gas output pipe is sequentially provided with a gas outlet valve and a vacuum pump; the detector is arranged above the top cover corresponding to a laser-emitting hole of the top cover; and the signal outlet end of the detector is in signal connection with the signal input end of the signal processor. The device has the advantages of simple processing, low cost and high signal-to-noise ratio and detection sensitivity.

Description

technical field [0001] The invention belongs to the technical field of optical sensing and relates to a device for gas concentration measurement. Background technique [0002] Whether it is air pollution (such as NO, NO 2 , SO 2 etc.) or human health diagnosis (O2, CO2, CO, etc.), or mining safety (CO, CH4, etc.) all involve the measurement of gas content and existence, especially the destruction of the global ozone layer and the greenhouse effect brought about by modern industrialization. , Photochemical smog and other serious consequences have a profound impact on national development and human health. The key technological innovation in the environmental field is one of the strategic goals proposed in the "National "Eleventh Five-Year" Science and Technology Development Plan" to basically control environmental pollution. Preliminary containment of the trend of ecological deterioration is the country's ardent hope for the scientific and technological community during the...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/31
Inventor 阎春生瑞小川
Owner ZHEJIANG UNIV
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