Coal mine gas multi-point on-line detection apparatus based on spectral absorption
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A technology for coal mine gas and detection device, which is applied in measurement device, color/spectral characteristic measurement, safety device, etc., can solve the problems of high cost, lack of network formation, low detection sensitivity, etc., and achieves low cost, elimination of errors, and guarantee of The effect of personnel safety
Active Publication Date: 2009-07-08
WUHAN TELECOMM DEVICES
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[0004] In recent years, portable fiber optic sensors and single-point on-line monitoring devices designed using the principle of fiber optic sensing have come out continuously, but there are many shortcomings such as high cost, low detection sensitivity, and no networking.
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[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 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...
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