CN203249865U - Coal mine gas concentration detection system based on infrared spectrum absorption - Google Patents
Coal mine gas concentration detection system based on infrared spectrum absorption Download PDFInfo
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- CN203249865U CN203249865U CN 201320290661 CN201320290661U CN203249865U CN 203249865 U CN203249865 U CN 203249865U CN 201320290661 CN201320290661 CN 201320290661 CN 201320290661 U CN201320290661 U CN 201320290661U CN 203249865 U CN203249865 U CN 203249865U
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Abstract
The utility model relates to a coal mine gas concentration detection system based on infrared spectrum absorption. At present, a thermocatalytic gas detection instrument is mostly adopted for underground gas concentration detection, however, the monitoring equipment is narrow in measuring range, difficult in sensor calibration and poor in stability and repeatability. The coal mine gas concentration detection system based on infrared spectrum absorption comprises two infrared light sources (1), wherein the infrared light sources are respectively aligned with light source modulators (2); the light source modulators are respectively aligned with a to-be-detected gas chamber (3) and a reference gas chamber (4); the to-be-detected gas chamber and the reference gas chamber are respectively connected with detectors (5); gas inlets (6) and gas outlets (7) are respectively formed in the to-be-detected gas chamber and the reference gas chamber; the exterior of the to-be-detected gas chamber and the exterior of the reference gas chamber are sleeved with a heating device (8); the detectors are connected with a signal processing device (9) at the same time. The coal mine gas concentration detection system based on infrared spectrum absorption is applied to gas concentration detection.
Description
Technical field:
The utility model relates to a kind of coal mine gas concentration detection system that absorbs based on infrared spectrum.
Background technology:
For a long time, gas accident is one of chief threat of Safety of Coal Mine Production, it is stable to have had a strong impact on social harmony, life security to national economy and the people causes great injury, along with improving constantly of coal mining technique, technological means, and the continuous expansion of exploitation scale, the coal-bed gas outburst amount is also increasing, therefore, it is the key of prevention coal mine gas explosion that the high-precision real-time online of realizing gas density detects, and the safety in production in colliery is significant.At present, fire damp concentration detects and mostly to adopt the thermocatalysis gas detection equipment, but the monitoring equipment measurement range of the type is narrow, pick up calibration is difficult, stability and poor repeatability.
Summary of the invention:
The purpose of this utility model provides a kind of coal mine gas concentration detection system that absorbs based on infrared spectrum.
Above-mentioned purpose realizes by following technical scheme:
A kind of coal mine gas concentration detection system that absorbs based on infrared spectrum, its composition comprises: two infrared light supplies, described infrared light supply is the alignment light source modulator respectively, described light modulator is aimed at respectively air chamber to be checked and reference gas chamber, described air chamber to be checked and reference gas chamber connect respectively detector, described air chamber to be checked and reference gas chamber are installed into respectively gas port and gas outlet, and described air chamber to be checked and reference gas chamber outer cover have heating arrangement; Described detector connects signal processing apparatus simultaneously.
The described coal mine gas concentration detection system that absorbs based on infrared spectrum, the inwall of described air chamber to be checked and reference gas chamber has all crossed infrared reflection film.
The described coal mine gas concentration detection system that absorbs based on infrared spectrum, described detector also has signal conditioning circuit, described signal processing apparatus also has differential amplifier circuit, described signal conditioning circuit connects differential amplifier circuit, and described differential amplifier circuit connects microprocessor.
The beneficial effects of the utility model:
1. to select the wavelength of infrared light supply be that visible light arrives to the utility model
, and satisfy
There is higher emittance at the place, modulation by light modulator has realized that the harmonic wave of methane gas concentration detects again, the modulated light source of the identical wavelength of two-way is transmitted into respectively reference gas chamber and is connected with the air chamber to be checked of methane gas, be preinstalled with standard nitrogen in the reference gas chamber, concentration is 99.9%, when the infrared light after the modulation passed reference gas chamber, light intensity can not be absorbed.Because gas to be detected is that Optical Absorption under its characteristic absorption wavelength is with its concentration change, therefore by the analysis to the methane gas absorption spectrum, can realize the detection of methane gas concentration, this pick-up unit has measuring accuracy height, measurement range is wide, signal to noise ratio (S/N ratio) is high and the response time is fast plurality of advantages with respect to traditional methane Concentration Measurement device.
The utility model is provided with two infrared light channel-detecting devices, the twin-channel methane Concentration Measurement method of this single wavelength based on differential type spectral absorption technology can suppress the detection system noise effectively, improve greatly efficient and the precision of methane Concentration Measurement, also greatly simplified the structure of detection system simultaneously.
This DSP digital signal processor that the utility model adopts itself has analog to digital conversion and signal processing function, the simulating signal of differential amplifier circuit output obtains current gas concentration after AD conversion and signal processing, and this value shown, simultaneously can be to surpassing the processing of reporting to the police of the situation of setting concentration.For ease of calling of gas concentration subsequent analysis and data, the data that difference detects are constantly stored.
The utility model has overlapped heating arrangement for examining air chamber and reference gas chamber, has got rid of the impact of external temperature and humidity, has kept the internal temperature of whole pick-up unit, makes the more stable indicated value of detector output.
Description of drawings:
Accompanying drawing 1 is detection system structural representation of the present utility model.
Accompanying drawing 2 is structural representations that signal processing apparatus of the present utility model is connected with detector.
Accompanying drawing 3 is monitoring system signal processing flow figure of the present utility model.
Embodiment:
Embodiment 1:
Coal mine gas concentration detection system based on the infrared spectrum absorption, its composition comprises: two infrared light supplies 1, described infrared light supply is alignment light source modulator 2 respectively, described light modulator is aimed at respectively air chamber 3 to be checked and reference gas chamber 4, described air chamber to be checked and reference gas chamber connect respectively detector 5, described air chamber to be checked and reference gas chamber are installed into respectively gas port 6 and gas outlet 7, and described air chamber to be checked and reference gas chamber outer cover have heating arrangement 8; Described detector connects signal processing apparatus 9 simultaneously, and described detector is light intensity detector.
Described infrared light supply, light modulator and detector are coaxial fixing with respect to described air chamber to be checked and reference gas chamber.
Be preinstalled with standard nitrogen in the described reference gas chamber, concentration is 99.9%.
Embodiment 2:
The embodiment 1 described coal mine gas concentration detection system that absorbs based on infrared spectrum, the inwall of described air chamber to be checked and reference gas chamber has all crossed infrared reflection film.
Embodiment 3:
Embodiment 1 or the 2 described coal mine gas concentration detection systems that absorb based on infrared spectrum, described detector also has signal conditioning circuit 10, described signal processing apparatus also has differential amplifier circuit 11, described signal conditioning circuit connects differential amplifier circuit, described differential amplifier circuit connects microprocessor 12, and described microprocessor adopts the DSP digital processing unit.
Principle: since methane gas in except containing methane, also contain the compositions such as carbon dioxide, water vapor and carbon monoxide.Can get the infrared waveband absorbing spectral line of various gas componants in the methane gas by looking into the HITRAN database, contrast various gases at the absorption peak of infrared band, then select methane to the wavelength of the strength of infrared Absorption intensity, take this wavelength as according to infrared light supply is modulated, detect the concentration of methane gas by the spectral absorption technology.The wavelength coverage of the infrared light supply that infrared light supply of the present utility model is selected from visible light to
, and satisfy
There is higher emittance at the place.
Methane Concentration Measurement process: because in the gas testing process, the sensitivity of pick-up unit and precision can be subjected to the impact of various external environment factors, so the utility model adopts the two twin-channel gas Differential Detection of light source list wavelength models, as shown in Figure 3, modulated light source through the identical wavelength of two-way after the adjusting of light modulator is transmitted into respectively reference gas chamber and the air chamber to be checked that is connected with methane gas, be preinstalled with standard nitrogen in the reference gas chamber, concentration is 99.9%, when the infrared light after the modulation passed reference gas chamber, light intensity can not be absorbed; The end of two air chambers all is equipped with light intensity detector, light through air chamber is received by light intensity detector, two light intensity detectors are converted to corresponding electric signal with the light intensity signal that receives, this electric signal is fainter, amplification and detection through signal conditioning circuit, the DSP digital processing unit of giving more afterwards of this two-way analog electrical signal process differential amplifier circuit is carried out A/ D conversion and processing, and the value of current concentration shown, set concentration if surpass, the processing of then reporting to the police, simultaneously the constantly detected next data of difference are stored, so that subsequent analysis
Claims (3)
1. coal mine gas concentration detection system that absorbs based on infrared spectrum, its composition comprises: two infrared light supplies, it is characterized in that: described infrared light supply is the alignment light source modulator respectively, described light modulator is aimed at respectively air chamber to be checked and reference gas chamber, described air chamber to be checked and reference gas chamber connect respectively detector, described air chamber to be checked and reference gas chamber are installed into respectively gas port and gas outlet, and described air chamber to be checked and reference gas chamber outer cover have heating arrangement; Described detector connects signal processing apparatus simultaneously.
2. the coal mine gas concentration detection system that absorbs based on infrared spectrum according to claim 1, it is characterized in that: the inwall of described air chamber to be checked and reference gas chamber has all crossed infrared reflection film.
3. the coal mine gas concentration detection system that absorbs based on infrared spectrum according to claim 1 and 2, it is characterized in that: described detector also has signal conditioning circuit, described signal processing apparatus also has differential amplifier circuit, described signal conditioning circuit connects differential amplifier circuit, and described differential amplifier circuit connects microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320290661 CN203249865U (en) | 2013-05-26 | 2013-05-26 | Coal mine gas concentration detection system based on infrared spectrum absorption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320290661 CN203249865U (en) | 2013-05-26 | 2013-05-26 | Coal mine gas concentration detection system based on infrared spectrum absorption |
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| CN203249865U true CN203249865U (en) | 2013-10-23 |
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| CN 201320290661 Expired - Fee Related CN203249865U (en) | 2013-05-26 | 2013-05-26 | Coal mine gas concentration detection system based on infrared spectrum absorption |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712943A (en) * | 2013-12-26 | 2014-04-09 | 武汉理工大学 | Gas conjugate interference filter |
| CN103926209A (en) * | 2013-12-26 | 2014-07-16 | 安徽理工大学 | DOAS double sampling technology based coal seam gas combined measurement system |
| CN104763469A (en) * | 2015-02-10 | 2015-07-08 | 山西大学 | Detection method for gas emission quantity on wall surface of mine laneway |
| CN104977269A (en) * | 2015-07-01 | 2015-10-14 | 吉林大学 | Self-adaptive infrared gas detecting device and method |
| CN105911010A (en) * | 2016-06-12 | 2016-08-31 | 北京千安哲信息技术有限公司 | Trace gas pollutant detecting device and method |
| CN106442377A (en) * | 2016-09-24 | 2017-02-22 | 大连理工大学 | Real-time double-beam in-situ infrared spectrum system and method thereof |
| CN108627429A (en) * | 2018-07-31 | 2018-10-09 | 郑州智谷工业技术有限公司 | A kind of nitrous oxide monitoring device and its monitoring method |
| CN109975234A (en) * | 2019-04-17 | 2019-07-05 | 深圳市唯锐科技有限公司 | A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum |
| CN112763443A (en) * | 2020-12-02 | 2021-05-07 | 珠海格力电器股份有限公司 | Carbon dioxide sensor, calibration method and online detector |
| CN116559105A (en) * | 2023-07-06 | 2023-08-08 | 国科大杭州高等研究院 | Linearization readout circuit system based on gas infrared spectrum detection technology |
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2013
- 2013-05-26 CN CN 201320290661 patent/CN203249865U/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926209A (en) * | 2013-12-26 | 2014-07-16 | 安徽理工大学 | DOAS double sampling technology based coal seam gas combined measurement system |
| CN103712943B (en) * | 2013-12-26 | 2016-05-11 | 武汉理工大学 | Gas conjugation interfere type wave filter |
| CN103712943A (en) * | 2013-12-26 | 2014-04-09 | 武汉理工大学 | Gas conjugate interference filter |
| CN104763469A (en) * | 2015-02-10 | 2015-07-08 | 山西大学 | Detection method for gas emission quantity on wall surface of mine laneway |
| CN104977269A (en) * | 2015-07-01 | 2015-10-14 | 吉林大学 | Self-adaptive infrared gas detecting device and method |
| CN104977269B (en) * | 2015-07-01 | 2017-10-24 | 吉林大学 | A kind of adaptive infrared gas detection device and method |
| CN105911010A (en) * | 2016-06-12 | 2016-08-31 | 北京千安哲信息技术有限公司 | Trace gas pollutant detecting device and method |
| CN106442377B (en) * | 2016-09-24 | 2018-11-09 | 大连理工大学 | A kind of real-time dual-beam in-situ ft-ir system and method |
| CN106442377A (en) * | 2016-09-24 | 2017-02-22 | 大连理工大学 | Real-time double-beam in-situ infrared spectrum system and method thereof |
| CN108627429A (en) * | 2018-07-31 | 2018-10-09 | 郑州智谷工业技术有限公司 | A kind of nitrous oxide monitoring device and its monitoring method |
| CN108627429B (en) * | 2018-07-31 | 2021-12-31 | 白宇轩 | Nitrous oxide monitoring device and monitoring method thereof |
| CN109975234A (en) * | 2019-04-17 | 2019-07-05 | 深圳市唯锐科技有限公司 | A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum |
| CN112763443A (en) * | 2020-12-02 | 2021-05-07 | 珠海格力电器股份有限公司 | Carbon dioxide sensor, calibration method and online detector |
| CN112763443B (en) * | 2020-12-02 | 2022-04-26 | 珠海格力电器股份有限公司 | Carbon dioxide sensor, calibration method and online detector |
| CN116559105A (en) * | 2023-07-06 | 2023-08-08 | 国科大杭州高等研究院 | Linearization readout circuit system based on gas infrared spectrum detection technology |
| CN116559105B (en) * | 2023-07-06 | 2023-11-14 | 国科大杭州高等研究院 | Linearization readout circuit system based on gas infrared spectrum detection technology |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131023 Termination date: 20140526 |