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

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...

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Problems solved by technology

[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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