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Dispersive infrared absorption gas detection device and method

A technology for infrared absorption and detection devices, which is applied in the directions of measuring devices, color/spectral characteristic measurement, and material analysis, etc. It can solve problems such as difficulties in making narrow bandwidth filters, affecting detection accuracy, and high cost of lasers, and achieves low cost and guaranteed Light splitting effect, effect of reducing difficulty

Inactive Publication Date: 2011-01-19
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] However, the non-dispersive infrared absorption gas sensor mainly has the following problems: (1) light-emitting diodes or incandescent lamps are used as light sources. Although the price is low, the infrared rays filtered by the filters in the system have a wide band, which affects the detection accuracy. However, narrow bandwidth filters are difficult to manufacture and expensive
(2) Using semiconductor lasers, although the detection accuracy is high, the cost of lasers is high, and the detection cost is high

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  • Dispersive infrared absorption gas detection device and method
  • Dispersive infrared absorption gas detection device and method
  • Dispersive infrared absorption gas detection device and method

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Embodiment Construction

[0024] The innovative design idea of ​​the spectroscopic infrared absorption gas detection device and method provided by the present invention is mainly embodied in the use of quasi-parallel light components and blazed gratings for light splitting, and the design principle is the principle of blazed grating splitting.

[0025] see figure 1 , the structure of the detection device of the present invention is: the device includes an air chamber 8 and a quasi-parallel light assembly 2, two plane reflective blazed gratings 3,4 are arranged in the air chamber 8, and the surfaces of the two plane reflective blazed gratings 3,4 All are sawtooth shaped. The upper end of the gas chamber 8 is provided with two pyroelectric detectors 5,6. The inside of the quasi-parallel component 2 is circular hole-shaped, and metal anodization has been carried out to prevent stray light from being reflected in the cavity. The exit end of the parallel component 2 is a small circular hole that limits th...

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Abstract

The invention discloses a dispersive infrared absorption gas detection device and a method. In the device and the method, based on infrared spectrum adoption theory, methane and carbon monoxide with the wavelengths of 3.433mu m and 4.65mu m are adopted; infrared light emitted by adopting an MEMS infrared light source is projected to a blazed grating through a collimated light component, and is split to acquire infrared lines with the wavelengths of 3.433mu m and 4.65mu m; and concentration detection on methane and carbon oxide in sample gas can be realized through an open air chamber. The device can detect the gas selectively, quickly and stably by combining the method, improves the corresponding accuracy, can realize simultaneous detection on the methane and the carbon oxide, and reduces cost.

Description

technical field [0001] The invention relates to the field of mine gas detection, in particular to a spectroscopic infrared absorption type gas detection device and method. Background technique [0002] Gas accidents are one of the main threats to coal mine safety production. They have always been a major problem in the mining industry and have brought great losses to the country and enterprises. The main components of coal mine gas are methane and carbon monoxide, both of which are flammable and explosive gases. For example, when the concentration of methane in the atmosphere reaches 5.3% to 15%, it is explosive. Therefore, it is necessary to carry out early detection of ambient gas in mines, and timely detection of gas concentration plays a very important role in mine safety production and personal safety. [0003] At present, the detection methods of the two dangerous gases methane and carbon monoxide in coal mines include electrochemical methods, optical methods, semicon...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/3504
Inventor 王海容岑迪门光飞王健云蒋庄德孙国良
Owner XI AN JIAOTONG UNIV
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