Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor

A technology of gas detection and laser absorption, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc. It can solve the problem of large gas chamber size, poor reliability and stability of sensor adjustment, and inconvenient for staff Carry it with you and detect methane gas and other problems in real time, so as to reduce the sampling space, increase the detection optical path limit, and quickly obtain the effect

Active Publication Date: 2006-07-26
EAST CHINA NORMAL UNIVERSITY
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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

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  • Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor

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Embodiment Construction

[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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Abstract

Disclosed is an absorption mash gas detecting method for of portable infrared semi-conductor laser, which comprises: employing infrared laser of 1.33ª

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. ...

Claims

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Application Information

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IPC IPC(8): G01N21/39G01N21/35G01N21/3504
Inventor 姚萌
Owner EAST CHINA NORMAL UNIVERSITY
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