CN205374298U - Trace gas concentration detection apparatus based on TDLAS - Google Patents
Trace gas concentration detection apparatus based on TDLAS Download PDFInfo
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- CN205374298U CN205374298U CN201620040067.2U CN201620040067U CN205374298U CN 205374298 U CN205374298 U CN 205374298U CN 201620040067 U CN201620040067 U CN 201620040067U CN 205374298 U CN205374298 U CN 205374298U
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Abstract
The utility model relates to a trace gas concentration detection apparatus based on TDLAS in gaseous monitoring field comprises signal generator, lock -in amplifier, laser -driven ware, laser instrument, collimater, air chamber, optical lens piece, focalizer, detector, data collection card, temperature sensor, pressure sensor, signal generator be connected with lock -in amplifier, laser driver respectively, the laser -driven ware is connected with laser instrument and control module respectively, is equipped with a plurality of optical lens pieces in the air chamber, detector output signal line connects lock -in amplifier, the lock -in amplifier output is connected to data collection card's input, temperature sensor, lock -in amplifier 0's output is connected to data collection card's input, data collection card is connected with control module through the data line. The utility model has the advantages of background gas cross interference, high precision measurement, quick response analysis can be eliminated, the correction of temperature pressure can be carried out in order to adapt to abominable measuring ring border.
Description
Technical field
This utility model belongs to gas-monitoring field, particularly relates to the detecting device of a kind of trace gas concentration.
Background technology
Trace gas refers to that volumetric concentration is far smaller than the gas of 1%; carbon oxygen in air, nitrogen oxygen, sulfur oxygen compound etc.; its content is in ppm-ppb order magnitude range; accurately measure the component of these trace gas, content and in time, the changes in distribution in space, be of great significance in environmental conservation or all have in the system optimization of industrial process and safety in production etc..
Current gas-monitoring has two big class methods: chemical analysis and spectra methods, the main chromatographic method of chemical method, mass spectrography and chromatograph-mass spectrometer coupling analytic process etc., there is significantly high sensitivity, measurement result with a high credibility, but response speed is slow, it is impossible to application on site.Spectrographic method infrared absorption method, differential optical absorption spectroscopy (DOAS), differential absorption lidar technology (DIAL), Fourier transform infrared spectroscopy technology (FTIR), optoacoustic spectroscopy (PAS) and tunable diode laser absorption spectrometry law technology (TDLAS) etc..TDLAS compares the advantage of other several spectrographic method and is in that: the advantage of TDLAS is in that: (1) detectivity is high；Generally can reach ppm-ppt magnitude；(2) environmental gas interference is little；(3) measuring speed is fast: several seconds；(4) can application on site.It is recent domestic study hotspot and main flow direction.
Summary of the invention
Tested gas in order to solve current gas measurement device is caused by background gas cross interference, and certainty of measurement is low, and the time of measuring is long, and the problem measuring environment narrow range, the purpose of this utility model is to provide a kind of magnanimity gas concentration detection apparatus based on TDLAS.
For achieving the above object, this utility model is achieved through the following technical solutions:
Trace gas concentration detecting device based on TDLAS, it is characterized in that, including signal generator, lock-in amplifier, laser driver, laser base, laser instrument, collimator, air chamber, optical glass, focalizer, detector, data collecting card, temperature sensor, pressure transducer, control module, the outfan of described signal generator respectively with lock-in amplifier, laser driver is connected, laser driver is connected with laser instrument and control module respectively, laser instrument is arranged on laser base, laser instrument output optical fibre connects collimator, collimator is arranged on the entry port of air chamber；Being provided with multiple optical glass in air chamber, laser, after the optical glass in air chamber repeatedly reflects, penetrates from exit ports；Described air chamber exit ports installs focalizer, focalizer connects detector, laser after focusing is received by detector, detector output signal line connects lock-in amplifier, lock-in amplifier outfan is connected to the input of data collecting card, the probe of temperature sensor is arranged on the center in air chamber, the output signal of temperature sensor is connected to the input of data collecting card, the input of pressure transducer is connected with air chamber gas outlet, the outfan of pressure transducer is connected to the input of data collecting card, data collecting card is connected with controlling module by data wire.
Described air chamber is long light path gas absorption cell, and detectivity is up to ppm magnitude.
The described trace gas concentration detecting device based on TDLAS, can be modified the impact of temperature and pressure parameter.
The described trace gas concentration detecting device based on TDLAS, the time of measuring is less than 10s.
Compared with prior art, the beneficial effects of the utility model are:
The detecting device of this utility model trace gas concentration, have and can eliminate background gas cross interference, high-acruracy survey, quick response analysis, temperature, pressure correction can be carried out to adapt to the advantage badly measuring environment, detectivity is up to ppm magnitude, and the time of measuring is less than 10s.
Accompanying drawing explanation
Fig. 1 is structure chart of the present utility model.
In figure: 101 signal generators, 102 lock-in amplifiers, 103 laser drivers, 104 laser bases, 105 laser instrument, 106 collimators, 107 air chambers, 108 optical glasss, 109 focalizers, 110 detectors, 111 data collecting cards, 112 temperature sensors, 113 pressure transducers, 114 control module, 115 air pumps, 116 effusion meters.
Detailed description of the invention
Below in conjunction with accompanying drawing, technology contents of the present utility model is described in further detail.
Based on the trace gas concentration detecting device of TDLAS, it is made up of signal generator 101, lock-in amplifier 102, laser driver 103, laser base 104, laser instrument 105, collimator 106, air chamber 107, optical glass 108, focalizer 109, Infrared Detectors 110, data collecting card 111, temperature sensor 112, pressure transducer 113, control module 114, air pump 115, effusion meter 116.nullThe output signal line of signal generator 101 is connected with lock-in amplifier 102 and laser driver 103，Laser driver 103 is connected with laser instrument 105 and control module 114，Laser instrument 105 is arranged on laser base 104，Laser instrument 105 output optical fibre connects collimator 106，Collimator 106 is arranged on air chamber 107 entry port，Laser is after more than 108 refraction of the optical glass in air chamber 107，Penetrate from exit ports，Exit ports installs focalizer 109，Laser after focusing is received by detector 110，Detector 110 output signal line connects lock-in amplifier 102，Lock-in amplifier 102 outfan is connected to data collecting card 111 input，The probe of temperature sensor 112 is arranged on the center in air chamber 107，The output signal of temperature sensor 112 is connected to data collecting card 111，The input of pressure transducer 113 is connected with the gas outlet of air chamber 107，The output signal line of pressure transducer 113 is connected to data collecting card 111，The outfan of air pump 115 is connected with air chamber 107，The input signal cable of air pump 115 is connected to data collecting card 111，Data collecting card 111 is by data wire link control module 114.
The operation principle of this device is described below:
When this measurement apparatus carries out gasmetry, by air pump 115 and effusion meter 116, gas to be measured is filled with in air chamber 107, signal generator 101 produces two paths of signals, one tunnel reference signal delivers to the reference edge of lock-in amplifier 102, one tunnel modulation signal delivers to laser driver 103, the output of modulation laser instrument 104；The laser signal of laser instrument 104 output, by fiber-optic transfer, the collimation hot spot formed after collimator 106 collimation, in long light path air chamber 107 after optical glass 108 multiple reflections back and forth, is converged on detector 110 by focalizer 109；The signal of detector 110 output is input to the signal end of lock-in amplifier 102, the harmonic signal that lock-in amplifier 102 obtains is gathered to the process and the computing that control to carry out in module 114 data by data collecting card 111, temperature sensor 112 simultaneously and pressure transducer 113 measure the temperature and pressure of air chamber 107 in real time, the signal of measurement is fed back to control module 114 by data collecting card 111 by temperature sensor 112 and pressure transducer 113, the measurement error that the ambient temperature of air chamber 107 and the change of pressure are caused by control module 114 is modified, draw concentration value accurately.
In present embodiment, air chamber is long light path gas absorption cell, and detectivity is up to ppm magnitude.The impact of temperature and pressure parameter can be modified by this device, and the time of measuring is less than 10s.
Claims (2)
1. based on the trace gas concentration detecting device of TDLAS, it is characterized in that, including signal generator, lock-in amplifier, laser driver, laser base, laser instrument, collimator, air chamber, optical glass, focalizer, detector, data collecting card, temperature sensor, pressure transducer, control module, the outfan of described signal generator respectively with lock-in amplifier, laser driver is connected, laser driver is connected with laser instrument and control module respectively, laser instrument is arranged on laser base, laser instrument output optical fibre connects collimator, collimator is arranged on the entry port of air chamber；Being provided with multiple optical glass in air chamber, laser, after the optical glass in air chamber repeatedly reflects, penetrates from exit ports；Described air chamber exit ports installs focalizer, focalizer connects detector, laser after focusing is received by detector, detector output signal line connects lock-in amplifier, lock-in amplifier outfan is connected to the input of data collecting card, the probe of temperature sensor is arranged on the center in air chamber, the output signal of temperature sensor is connected to the input of data collecting card, the input of pressure transducer is connected with air chamber gas outlet, the outfan of pressure transducer is connected to the input of data collecting card, data collecting card is connected with controlling module by data wire.
2. the trace gas concentration detecting device based on TDLAS according to claim 1, it is characterised in that described air chamber is long light path gas absorption cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620040067.2U CN205374298U (en) | 2016-01-15 | 2016-01-15 | Trace gas concentration detection apparatus based on TDLAS |
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| CN201620040067.2U CN205374298U (en) | 2016-01-15 | 2016-01-15 | Trace gas concentration detection apparatus based on TDLAS |
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| CN106645024A (en) * | 2016-12-17 | 2017-05-10 | 浙江泰林生物技术股份有限公司 | TDLAS-based wide-range detector for concentration of gasified H2O2 |
| CN107064058A (en) * | 2017-01-05 | 2017-08-18 | 中国地质调查局水文地质环境地质调查中心 | A kind of shale gas leakage multiple gases on-Line Monitor Device and method |
| CN107064008A (en) * | 2017-03-15 | 2017-08-18 | 南京航空航天大学 | A kind of anti-vibration long light path gas pond |
| CN107144549A (en) * | 2017-05-11 | 2017-09-08 | 西安科技大学 | Detection means and method based on TDLAS trace CO gas concentrations |
| CN107991268A (en) * | 2018-01-11 | 2018-05-04 | 中国石油大学(华东) | More gas composition detection method and device based on multifrequency modulation and multifrequency demodulation |
| CN107991238A (en) * | 2017-12-29 | 2018-05-04 | 汉威科技集团股份有限公司 | A kind of laser methane gas sensor |
| CN108181265A (en) * | 2017-12-14 | 2018-06-19 | 北京航天易联科技发展有限公司 | A kind of binary channels low concentration aqueous vapor high precision measuring device and method |
| CN108254338A (en) * | 2018-03-20 | 2018-07-06 | 哈工大鞍山工业技术研究院有限公司 | Gas content in transformer oil on-Line Monitor Device based on spectral absorption method |
| CN108279209A (en) * | 2018-04-11 | 2018-07-13 | 中国石油大学(华东) | A kind of more gas detecting systems of wave-length coverage and wavelength continuously adjustable |
| CN108318450A (en) * | 2018-05-07 | 2018-07-24 | 中国石油大学(华东) | A kind of diving pull-type deep-sea methane concentration situ detection system |
| CN108572159A (en) * | 2018-05-18 | 2018-09-25 | 东北石油大学 | A kind of multielement hot fluid component CO2And H2O content laser reflection type detection device |
| CN109060665A (en) * | 2018-08-09 | 2018-12-21 | 山东恒晋仪器有限公司 | The device of extending space gas detection range |
| CN109406407A (en) * | 2018-11-19 | 2019-03-01 | 长沙矿山研究院有限责任公司 | The dynamic response time detection device and method of infrared laser methane concentration measuring apparatus |
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| CN109596566A (en) * | 2018-10-29 | 2019-04-09 | 中国科学院合肥物质科学研究院 | A kind of gas detection absorption inside cavity temperature and pressure integrated control unit |
| CN110261349A (en) * | 2019-07-04 | 2019-09-20 | 哈尔滨工程大学 | Gas concentration measuring method and device based on TDLAS |
| CN112461785A (en) * | 2020-09-30 | 2021-03-09 | 北京工业大学 | Aviation oxygen monitoring system based on TDLAS combined Fabry-Perot optical chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106645024A (en) * | 2016-12-17 | 2017-05-10 | 浙江泰林生物技术股份有限公司 | TDLAS-based wide-range detector for concentration of gasified H2O2 |
| CN107064058A (en) * | 2017-01-05 | 2017-08-18 | 中国地质调查局水文地质环境地质调查中心 | A kind of shale gas leakage multiple gases on-Line Monitor Device and method |
| CN107064058B (en) * | 2017-01-05 | 2020-08-21 | 中国地质调查局水文地质环境地质调查中心 | Shale gas leakage multiple gas online monitoring device and method |
| CN107064008B (en) * | 2017-03-15 | 2019-12-24 | 南京航空航天大学 | Anti-vibration long-optical-path gas pool |
| CN107064008A (en) * | 2017-03-15 | 2017-08-18 | 南京航空航天大学 | A kind of anti-vibration long light path gas pond |
| CN107144549A (en) * | 2017-05-11 | 2017-09-08 | 西安科技大学 | Detection means and method based on TDLAS trace CO gas concentrations |
| CN107144549B (en) * | 2017-05-11 | 2023-04-14 | 西安科技大学 | Detection device and method based on TDLAS trace CO gas concentration |
| CN108181265B (en) * | 2017-12-14 | 2020-12-22 | 北京航天易联科技发展有限公司 | Double-channel low-concentration water-gas high-precision measuring device and method |
| CN108181265A (en) * | 2017-12-14 | 2018-06-19 | 北京航天易联科技发展有限公司 | A kind of binary channels low concentration aqueous vapor high precision measuring device and method |
| CN107991238A (en) * | 2017-12-29 | 2018-05-04 | 汉威科技集团股份有限公司 | A kind of laser methane gas sensor |
| CN107991268A (en) * | 2018-01-11 | 2018-05-04 | 中国石油大学(华东) | More gas composition detection method and device based on multifrequency modulation and multifrequency demodulation |
| CN108254338B (en) * | 2018-03-20 | 2023-10-13 | 湖南五凌电力科技有限公司 | Online monitoring device for gas content in transformer oil based on spectrum absorption method |
| CN108254338A (en) * | 2018-03-20 | 2018-07-06 | 哈工大鞍山工业技术研究院有限公司 | Gas content in transformer oil on-Line Monitor Device based on spectral absorption method |
| CN108279209A (en) * | 2018-04-11 | 2018-07-13 | 中国石油大学(华东) | A kind of more gas detecting systems of wave-length coverage and wavelength continuously adjustable |
| CN108318450A (en) * | 2018-05-07 | 2018-07-24 | 中国石油大学(华东) | A kind of diving pull-type deep-sea methane concentration situ detection system |
| CN108572159A (en) * | 2018-05-18 | 2018-09-25 | 东北石油大学 | A kind of multielement hot fluid component CO2And H2O content laser reflection type detection device |
| CN109060665A (en) * | 2018-08-09 | 2018-12-21 | 山东恒晋仪器有限公司 | The device of extending space gas detection range |
| CN109596566A (en) * | 2018-10-29 | 2019-04-09 | 中国科学院合肥物质科学研究院 | A kind of gas detection absorption inside cavity temperature and pressure integrated control unit |
| CN109406407A (en) * | 2018-11-19 | 2019-03-01 | 长沙矿山研究院有限责任公司 | The dynamic response time detection device and method of infrared laser methane concentration measuring apparatus |
| CN109406407B (en) * | 2018-11-19 | 2024-05-14 | 长沙矿山研究院有限责任公司 | Dynamic response time detection device and method for infrared laser methane concentration measuring instrument |
| CN109459425A (en) * | 2018-12-13 | 2019-03-12 | 云南电网有限责任公司电力科学研究院 | A kind of fiber adapters device applied to optical fiber gas sensing |
| CN110261349A (en) * | 2019-07-04 | 2019-09-20 | 哈尔滨工程大学 | Gas concentration measuring method and device based on TDLAS |
| CN113358600A (en) * | 2020-03-06 | 2021-09-07 | 山东大学 | Gas detection chamber, laser spectrum gas detection system based on artificial neural network and laser spectrum gas detection method based on artificial neural network |
| CN112461785A (en) * | 2020-09-30 | 2021-03-09 | 北京工业大学 | Aviation oxygen monitoring system based on TDLAS combined Fabry-Perot optical chamber |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200106 Address after: 114001 Qianshan Road, Qianshan high tech Zone, Anshan, Liaoning, 318 Patentee after: Yasai Electromagnetic Equipment Co., Ltd., Anshan Address before: 114045 No. 753, laser Industrial Park, hi tech Zone, Liaoning, Anshan Patentee before: Anshan Ha Gong laser Science and Technology Ltd. |
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| TR01 | Transfer of patent right |