Coal mine gas multi-point on-line detection apparatus based on spectral absorption

A coal mine gas and spectral absorption technology, which is applied in the direction of measuring devices, color/spectral characteristic measurement, safety devices, etc., can solve the problems of low detection sensitivity, high cost, and no networking, etc., to ensure personnel safety and low cost , the effect of eliminating errors

A coal mine gas and spectral absorption technology, which is applied in the direction of measuring devices, color/spectral characteristic measurement, safety devices, etc., can solve the problems of low detection sensitivity, high cost, and no networking, etc., to ensure personnel safety and low cost , the effect of eliminating errors

CN101477042BActive Publication Date: 2011-09-14WUHAN TELECOMM DEVICES
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  • Coal mine gas multi-point on-line detection apparatus based on spectral absorption
  • Coal mine gas multi-point on-line detection apparatus based on spectral absorption
  • Coal mine gas multi-point on-line detection apparatus based on spectral absorption

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Embodiment Construction

[0079] Below in conjunction with accompanying drawing and embodiment describe in detail:

[0080] 1. Overall

[0081] Such as figure 1 , the present invention consists of a D / A conversion module 1, a DFB laser 2, a 1*N optical splitter 3, an open gas chamber group 4, a reference gas chamber 5, a photodetector group 6, a preamplifier group 7, and an electronic switch 8 , band-pass filter circuit 9, first and second lock-in amplifier circuits 10 and 11, first and second A / D conversion modules 12 and 13, first, second and third DDS14, 15 and 16, MCU17, display 18, Composition of serial port 19 and computer 20;

[0082] Its connection relationship is:

[0083] The D / A conversion module 1 and the first and second A / D conversion modules 12 and 13 are built in the MCU17;

[0084] MCU17 is respectively connected with the first, second and third DDS14, 15 and 16, and initializes them respectively;

[0085] The D / A conversion module 1 and the first DDS14 are respectively connected ...

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Abstract

The present invention discloses a multi-point on-line detection device for coal mine gas based on spectral absorption, and relates to a coal mine gas detection device, in particular to a multi-point on-line CH4 concentration monitoring device based on a characteristic absorption line of methane (CH4) near a near infrared band 1653nm. The device comprises a D / A conversion module, a DFB laser, a 1*N optical splitter, an open air chamber group, a reference air chamber, a photodetector group, a preamplifier group, an electronic switch, a band-pass filtering circuit, a first phase-locked amplification circuit, a second phase-locked amplification circuit, a first A / D conversion module, a second A / D conversion module, a first DDS, a second DDS, a third DDS, an MCU, a display, a serial port, and a computer. Compared with the prior methane gas monitoring device, the device has the advantages of higher sensitivity, higher gas identification ability, quick response ability, extremely strong anti-jamming ability, easy network formation, and so on, so the device is a gas monitoring device which is most suitable to be used underground at present.

Description

technical field [0001] The invention relates to a coal mine gas detection device, in particular to a multi-point online detection device for coal mine gas based on spectral absorption; specifically, to a methane (CH 4 ) is a multi-point online detection device for coal mine gas developed for the characteristic absorption line near the near-infrared wavelength of 1653nm. Background technique [0002] my country has a large population and rich mineral resources; however, coal mine gas and dust explosion accidents have seriously affected the safety of coal mine production. The main component of gas in coal mines is CH 4 , accounting for about 83-89%, gas is an important source of natural disasters in coal mines. When the gas reaches a certain concentration, it can suffocate people and explode when encountering a fire source; the gas explosion can also easily cause a coal dust explosion. Gas outburst in coal mines is also a strong dynamic phenomenon and a serious disaster. Ga...

Claims

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Application Information

Patent Timeline
14 Sep 2011
Publication
CN101477042B
IPC
G01N21/35; E21F11/00; G01N21/3504
Inventors
向雄; 林楠