Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor
A gas detection and laser absorption technology, which is used in measurement devices, color/spectral property measurement, and material analysis by optical means. Carry it with you and detect problems such as methane gas in real time, so as to reduce the sampling space, increase the detection light path limit, and quickly obtain the results
Active Publication Date: 2009-02-11
EAST CHINA NORMAL UNIV
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Problems solved by technology
[0005] 1. The size of the necessary gas chamber for collecting gas samples is too large (generally 0.5 meters), which is not convenient for the staff to carry and detect the concentration of methane gas in real time;
[0006] 2. This type of sensor needs to be adjusted frequently, and its reliability and stability are poor
Therefore, this type of light source cannot be miniaturized due to the limitations of the stability of the infrared light source and the energy consumption and volume of the source.
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[0016] What accompanying drawing provides is the schematic diagram of the present invention, also is the connection schematic diagram of its device.
[0017] The present invention will be further described below in conjunction with the accompanying drawings, and embodiments of the present invention will be given.
[0018] The portable infrared semiconductor laser absorption type gas detection method and device provided by the present invention; the innovative design idea of the present invention mainly focuses on the gas resonant cavity, and the design principle is the Fabry-Perot principle.
[0019] It is a creative improvement to the miniaturization of the coal mine gas test commonly used at home and abroad. It can make the light incident at a small angle undergo multiple refraction (reflection) in the gas resonant cavity, so as to increase the optical path. The purpose is to make the light fully contact with the gas to be measured, thereby reducing the size of the traditi...
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Disclosed is an absorption mash gas detecting method for of portable infrared semi-conductor laser, which comprises: employing infrared laser of 1.33mum or1.665mum generated by infrared light-emitting diode, making the incidence laser inject into a small chamber with limited space which is connected with the mash gas filed and generate harmonic oscillation in the gas chamber; then transmitting the testing photoelectricity signal after converting to the signal processing terminal via another infrared absorption gas sensor installed in the gas chamber; deciding whether warning or not after judging by the signal processing terminal.
Description
technical field [0001] The invention relates to a portable infrared semiconductor laser absorption type gas detection method and device, which belongs to the laser detection technology category and is used for on-site detection of gas concentration in coal mines. Background technique [0002] Methane is the main part of flammable and explosive gases and various fuels. The lower limit of explosion in the atmosphere is 4.9% and the upper limit is 15.4%. Methane explosion has always been one of the important disasters in coal mines. In order to prevent explosion accidents, the surrounding Early safety detection of gas is very necessary. Timely detection of the volume fraction of methane gas plays a very important role in the safe operation of industrial mines and personal safety. [0003] The infrared gas sensor has the advantages of high detection accuracy, suitable for a wide concentration range and long service life, and will gradually replace the previous gas detectors. ...
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IPC IPC(8): G01N21/39G01N21/35G01N21/3504
Inventor 姚萌
Owner EAST CHINA NORMAL UNIV