Space beam coupling device for photoacoustic multi-component gas detection

A technology for gas detection and coupling device, which is applied in measurement device, color/spectral characteristic measurement, material analysis by optical means, etc. The effect of improving utilization efficiency, low cost and reducing energy consumption

Active Publication Date: 2014-07-30
BEIJING RES INST OF TELEMETRY +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) Existing photoacoustic gas measurement devices mainly use a single-ended single light source to enter the gas cell. The singleness of the light source determines that there are few types of gas to be measured, which has great limitations.
[0007] (2) In order to realize the measurement of various gases, the existing photoacoustic gas measurement device adopts the method of one light source corresponding to one gas cell. With the increase of detection components, the complexity of the device increases

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  • Space beam coupling device for photoacoustic multi-component gas detection
  • Space beam coupling device for photoacoustic multi-component gas detection
  • Space beam coupling device for photoacoustic multi-component gas detection

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0037] Such as figure 1 As shown, the present invention is a spatial beam coupling device for photoacoustic multi-component gas detection, including composite light source A1, window A2, gas cell 3, acoustic sensor 4, window B5, and composite light source B6.

[0038] Both ends of the gas pool 3 can enter light at the same time. The gas pool 3 can adopt both ends to enter light at the same time, and can also adopt a single end to enter light. There is an acoustic resonant cavity in the gas pool 3. The acoustic resonant cavity is cylindrical, and its diameter is much smaller than that of the sound in the resonance. The wavelength transmitted in the cavity, the diameter of the acoustic resonance cavity is 1-10mm, and the length is 10-300mm; the window A2 is fixed at one end of the acoustic resonance cavity of the gas pool 3 at a certain angle, and...

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Abstract

The invention discloses a space beam coupling device for photoacoustic multi-component gas detection. The space beam coupling device comprises a composite light source, a window, a gas cell and an acoustic sensor. Output beams in the composite light source are modulated to excite gases in the gas cell, so that the excited gases in the gas cell are not subjected to radiative transition to generate a photo-thermal signal, the photo-thermal signal is measured through the acoustic sensor, the signal of the acoustic sensor is analyzed, and the concentration of the tested gas can be converted. The coupling device has the advantages of small size, fast response, low background noise, simultaneous multi-component detection and the like, is suitable for a photoacoustic spectrum monitoring system for environmental gases and also can be used for multi-light source coupling and detection of related equipment in the fields of spectral analysis and analytical instruments.

Description

technical field [0001] The invention designs a space beam coupling device for photoacoustic multi-component gas detection, which is suitable for the photoacoustic spectrum monitoring system of ambient gas, and can also be used for multi-light sources of related equipment in the fields of spectral analysis, Pope analysis, and chemical measurement. Coupling belongs to the technical field of instruments and meters. Background technique [0002] The application of photoacoustic spectroscopy to gas detection is to quantitatively analyze the gas concentration by detecting the absorption of laser photon energy by gas molecules. If the light source is modulated with a certain audio frequency, it can be detected by an acoustic detector in a special photoacoustic cavity. To the sound signal with the same frequency as the modulation, the gas concentration can be analyzed through the sound signal. Since different gases have selective absorption characteristics for different frequency l...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/31
Inventor 周建发彭泳卿杨显涛
Owner BEIJING RES INST OF TELEMETRY
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