CN107478600A - Harmful gas concentration detecting system and its detection method - Google Patents
Harmful gas concentration detecting system and its detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 39
- 238000010521 absorption reaction Methods 0.000 claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 230000000505 pernicious effect Effects 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
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- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 6
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention discloses a kind of harmful gas concentration detecting system and its detection method, pernicious gas gas is passed through multi-optical path absorption pond, temperature and electric current as needed for LD drivers provide diode laser work, multi-optical path absorption pond is incided after the tuning laser collimator collimation of diode laser output, in pond after multiple reflections and absorption, output light is received by photoelectric detector, photoelectric detector converts optical signals to electric signal by photoelectric conversion module, enter acquisition and control system after preamplifier and lock-in amplifier again, then it is sent to arm processor by A/D converter, monitoring result is sent to pernicious gas remote monitoring computer finally by GPRS module.By the above-mentioned means, harmful gas concentration detecting system of the present invention and its detection method detectivity are high, the monitoring to pernicious gas high accuracy fast speed in air is disclosure satisfy that, the scope of detection is wide, and the response time is fast, and message transmission rate is high.
Description
Technical field
The present invention relates to gas detection technology field, more particularly to a kind of harmful gas concentration detecting system and its detection
Method.
Background technology
With the deterioration of air quality, there are wide range of haze weather, some areas in China Middle Eastern continuous a couple of days
Air quality reach more than six grades serious pollutions.Haze weather is mainly due to the automobile in city in recent years is more and more, automobile
The factors such as the secondary pollution that a large amount of discharges of tail gas and factory produce.The task of air pollution surveillance system is to air
In pollutant continuously and automatically monitored, obtain continuous instantaneous atmosphere pollution information.Air monitoring project at present
Mainly there are sulfur dioxide, nitrogen oxides, carbon monoxide, suspended particulate substance or floating dust, ozone, hydrogen sulfide, total hydrocarbon, first
Alkane, non-methane hydrocarbon and meteorologic parameter etc., the method for monitoring and analyzing of domestic dusty gas mainly include：Stechiometry, optics
Point-score, measurement method of electricity.
TDLAS (Tunable Diode Laser Absorption Spectr-oscopy) technology is tunable diode
The abbreviation of laser absorption spectroscopy, tunable diode laser absorption spectroscopy technology is generally also known as, is mainly to utilize in air
Trace contamination gas qualitative and quantitative analysis is carried out to ultraviolet and visible light wave range Absorption Characteristics.That is every kind of dirt
Dye thing has its specific absorption spectrum line, just as the fingerprint of people.In atmosphere environment supervision field, TDLAS technologies are profits
With diode laser length scanning characteristic, the absorption spectrum in the range of the characteristic absorption spectrum of tested gas is obtained, so as to right
Dusty gas carries out qualitative or quantitative analysis.
Radio Transmission Technology makes great progress in recent years, and wherein GPRS technologies receive extensive pass in industrial quarters
Note.GPRS (General Packet Radio Service, GPRS) is a kind of packet switching system, it
Have the characteristics that to access rapid, always online, charge on traffic, have in long-range burst data real-time Transmission incomparable
Advantage, the RTTS for the small data quantity that is particularly suitable for taking place frequently as industrial remote monitoring system.GPRS remote terminals
Mainly play data transfer in industrial remote monitoring system, by the data collected (typically by RS232 or
RS485 GPRS remote terminals) are sent to, is then transferred data to and connect by GPRS networks and internet by the terminal
Enter the distance host of internet.
The intensity noise of semiconductor laser is the principal element of the detection sensitivity of reduction system.In existing monitoring system
In, due to being influenceed by thermal migration and being shifted in collection background spectra with the striped during signal spectrum, as a result cause striped
It can not be eliminated well, therefore the intensity noise of external disturbance and semiconductor laser is very big, while detection sensitivity is bad, very
Difficulty realizes the monitoring of high-precision high-speed.
The content of the invention
The present invention solves the technical problem of provide a kind of harmful gas concentration detecting system and its detection method, fortune
Harmful gas concentration is tested with based on TDLAS technologies, ARM technologies and GPRS technologies, system response time block, essence
Degree is high, is suitable for carrying out detecting harmful gas concentration detection under adverse circumstances, and to follow-up ARM CPU circuit with
And software has carried out design, exploitation and debugging；Devise that network coverage is wide, system using GPRS modules on this basis
The fast monitoring system of strong antijamming capability, communication speed.
In order to solve the above technical problems, one aspect of the present invention is：A kind of harmful gas concentration inspection is provided
Examining system, including：Pernicious gas detection part, arm processor and GPRS remote monitorings part,
Wherein pernicious gas detection part includes LD drivers, diode laser, multi-optical path absorption pond, photoelectric detector, light
Electric modular converter, preamplifier, lock-in amplifier and data acquisition and control module and A/D converter,
GPRS remote monitorings part includes GPRS module and pernicious gas remote monitoring computer,
The input of the output end connection diode laser of LD drivers, the output end of diode laser are connected by collimater
Connect multi-optical path absorption pond, the input of the output end connection photoelectric detector in multi-optical path absorption pond, the output end of photoelectric detector
Connect the input of photoelectric conversion module, the input of the output end connection preamplifier of photoelectric conversion module, preposition amplification
The input of the output end connection lock-in amplifier of device, the output end connection data acquisition of lock-in amplifier and control module, number
A/D converter is connected with control module according to collection,
The input of the output end connection arm processor of A/D converter, the output end connection GPRS module of arm processor, GPRS
Module connects pernicious gas remote monitoring computer.
In a preferred embodiment of the present invention, LD drivers are directly connected to signal source, and for diode laser
The temperature and electric current needed for work are provided, then modulating signal source produces modulated signal.
In a preferred embodiment of the present invention, optical splitter is connected with the output end of diode laser, optical splitter
Output end is respectively connecting to the first detector, the second detector and photoelectric detector.
In a preferred embodiment of the present invention, the output light of diode laser is divided into three parts by optical splitter, respectively
For first via light, the second road light and the 3rd road light, first via light, the second road light and the 3rd road light are separately input into the first detection
Device, the second detector and photoelectric detector.
In a preferred embodiment of the present invention, first via light is directly entered the first detector, for determining laser intensity
And monitor lasing light emitter.
In a preferred embodiment of the present invention, built-in reference cell, the second tunnel are provided between optical splitter and the second detector
Light is by entering the second detector after built-in reference cell, for determining the work zero point of monitoring system, realize detecting system oneself
Demarcation.
In a preferred embodiment of the present invention, the 3rd road light is passed through by optical cable transmission to collimater, accurate by collimater
Into multi-optical path absorption pond and through the tested gas in tested gas pipeline after straight, then photoelectric detector absorbs, then passes through
Photoelectric conversion module is converted into electric signal, and gas concentration is obtained after subsequent treatment.
In a preferred embodiment of the present invention, diode laser modulation electric current includes two parts：Direct current is adjusted
Saw-tooth current is made and carries out wave spectrum frequency modulation again on the basis of sawtooth current.
In order to solve the above technical problems, another technical solution used in the present invention is：A kind of harmful gas concentration is provided
The detection method of detecting system, comprises the following steps：
A, that the trace contamination gas in atmospheric environment is passed through into multi-optical path absorption pond etc. is to be detected；
B, temperature and electric current as needed for LD drivers provide diode laser work, modulating signal source produce modulated signal, and
Diode laser is supplied to by LD drivers the tuning of laser is exported to it to realize；
C, multi-optical path absorption pond is incided after the tuning laser collimator collimation of diode laser output, in multi-optical path absorption
Through multiple reflections and after sample gas absorbs in pond, output light is received by photoelectric detector again；
D, the optical signal for carrying gas absorption information is converted to electric signal by photoelectric detector by photoelectric conversion module, before
Put after amplifier carries out primary amplification to the signal, then harmonic detecting, the ginseng of lock-in amplifier are carried out to it by lock-in amplifier
Signal is examined to be produced by modulating signal source；
E, the analog signal of lock-in amplifier output is sent to arm processor after A/D converter is changed, finally by GPRS module
Monitoring result is sent to pernicious gas remote monitoring computer.
The beneficial effects of the invention are as follows：Harmful gas concentration detecting system and its detection method detectivity of the present invention
It height, can typically reach ppb-ppt magnitudes, disclosure satisfy that the requirement of trace contamination gas-monitoring in air, the scope of detection is wide,
Response time is fast, is very suitable for a wide range of (large scale) real time monitoring；GPRS nets wide coverage, data transfer speed
Rate is high, always online, expense is low, no territory restriction, saves the advantages such as huge networking expense, solve atmosphere pollution it is a wide range of,
In real time, problem is monitored on-line for a long time；System employs ARM embeded processors, and real-time is good, can offline operation, carrying side
Just, except for atmosphere environment supervision, being also extrapolated to the hazardous gas detection of the industries such as chemical industry, electric power, mine.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing, wherein：
Fig. 1 is the structural representation of the preferred embodiment of harmful gas concentration detecting system one of the present invention；
The mark of each part is as follows in accompanying drawing：101st, LD drivers, 102, diode laser, 103, optical splitter, 104, first
Detector, 105, built-in reference cell, the 106, second detector, 107, collimater, 108, multi-optical path absorption pond, 109, tested gas
Pipeline, 110, photoelectric detector, 111, photoelectric conversion module, 112, preamplifier, 113, lock-in amplifier, 114, data adopt
Collection and control module, 115, A/D converter, 200, arm processor, 301, GPRS module, 302, evil gas remote monitoring calculates
Machine.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example is only the part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
All other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
Referring to Fig. 1, the embodiment of the present invention includes：
A kind of harmful gas concentration detecting system, including：Pernicious gas detection part, arm processor 200 and GPRS remote monitorings
Part.
Wherein pernicious gas detection part include LD drivers 101, diode laser 102, multi-optical path absorption pond 108,
Photoelectric detector 110, photoelectric conversion module 111, preamplifier 112, lock-in amplifier 113 and data acquisition and control module
114 and A/D converter 115, GPRS remote monitorings part include GPRS module 301 and pernicious gas remote monitoring computer 302.
The input of the output end connection diode laser 102 of LD drivers 101, the output of diode laser 102
End connects multi-optical path absorption pond 108 by collimater 107, the output end connection photoelectric detector 110 in multi-optical path absorption pond 108
Input, the input of the output end connection photoelectric conversion module 111 of photoelectric detector 110, the output of photoelectric conversion module 111
The input of end connection preamplifier 112, the input of the output end connection lock-in amplifier 113 of preamplifier 112, lock
Output end connection data acquisition and the control module 114 of phase amplifier 113.
Data acquisition is connected A/D converter 115, the output end connection ARM processing of A/D converter 115 with control module 114
The input of device 200, the output end connection GPRS module 301 of arm processor 200, it is long-range that GPRS module 301 connects pernicious gas
Monitor computer 302.
Above-mentioned LD drivers 101 are directly connected to signal source, and for providing the temperature needed for work to diode laser 102
Degree and electric current, then modulating signal source produces modulated signal, and it is defeated to its to realize by LD drivers 101 to be supplied to laser
Go out the tuning of laser.
Optical splitter 103 is connected with the output end of diode laser 102, the output end of optical splitter 103 is respectively connecting to
First detector 104, the second detector 106 and photoelectric detector 110.Optical splitter 103 is by the output light of diode laser 102
It is divided into three parts, respectively first via light, the second road light and the 3rd road light, first via light, the second road light and the 3rd road light difference
Input to the first detector 104, the second detector 106 and photoelectric detector 110.
First via light is directly entered the first detector 104, for determining laser intensity and monitoring lasing light emitter；
Built-in reference cell 105 is provided between the detector 106 of optical splitter 103 and second, after the second road light is by built-in reference cell 105
Into the second detector 106, for determining the work zero point of monitoring system, the self-calibration of detecting system is realized；
3rd road light is passed through by optical cable transmission to collimater 107, enters multi-optical path absorption pond 108 after the collimation of collimater 107
And the tested gas in tested gas pipeline 109 is passed through, then photoelectric detector 110 absorbs, then by photoelectric conversion module 111
Electric signal is converted into, gas concentration is obtained after subsequent treatment.
Diode laser 108 has temperature adjustment and the main adjusting wavelength method of two kinds of current regulation.Current regulation phase
There is the characteristics of good linearity, controllability are good, sweep speed is fast for temperature adjustment.Therefore ambient temperature is used, modulates two poles
The scheme of pipe laser Injection Current, modulation electric current are divided into two stages：
First, direct current is modulated into saw-tooth current；2nd, wave spectrum frequency modulation is carried out again on the basis of sawtooth current, it is now electric
Stream injection diode laser is converted into be exported by modulation laser, and laser is collected in In- by tested gas, part reflected light
On GaAs PIN fixed height of photocell, the optical signal of the information such as the carrying gas concentration received is converted to electric signal by photoelectric tube,
First signal interprets the concentration of tested gas respectively through locking mutually amplification, anti-aliased filtering, A/D conversions and Digital Signal Processing
Information.
The part of LD drivers 101 not only adjusts laser diode current, and process signal：Analog circuit mainly by frequency
Rate selects the phaselocked loop of enlarging function, and lock-in amplifier circuit is designed using cross-correlation test, and it directly measures and is submerged in noise
In measured signal, export a DC voltage directly proportional to measured signal, phase-sensitive detector by harmonic signal with reference to letter
Number multiplication, the signal that accurate detection is modulated from containing noisy amplitude-modulated wave, the signal of demodulation is sent to arm processor, most
Pernicious gas remote monitoring computer is sent to by wireless network by GPRS module.
The configuration of 301 pieces of GPRS moulds is substantially carried out the selection of serial ports and the setting of remote monitoring Computer IP and port numbers,
The selection of serial ports includes the setting of baud rate, even-odd check, data bit and stop position again；Pernicious gas monitor portion includes gas
The reception of concentration data is shown and remote data acquisition system control, includes acquisition system to remote data acquisition system control
Configuration at the beginning, various gas concentration alarming values are set and the selection to specific gas is handled etc..
A kind of detection method of harmful gas concentration detecting system, comprises the following steps：
A, that the trace contamination gas in atmospheric environment is passed through into multi-optical path absorption pond 108 etc. is to be detected；
B, by LD drivers 101 provide diode laser 102 work needed for temperature and electric current, modulating signal source produces modulation letter
Number, and diode laser 102 is supplied to by LD drivers 101 tuning of laser is exported to it to realize；
C, the tuning laser collimator 107 that diode laser 102 exports incides multi-optical path absorption pond 108 after collimating,
Through multiple reflections and after sample gas absorbs in multi-optical path absorption pond 108, output light is received by photoelectric detector 110 again；
D, the optical signal for carrying gas absorption information is converted to electric signal by photoelectric detector 110, right by preamplifier 112
After the signal carries out primary amplification, then by lock-in amplifier 113 harmonic detecting is carried out to it, reference of lock-in amplifier 113 is believed
Number produced by modulating signal source；
E, the analog signal that lock-in amplifier 113 exports is sent to arm processor 200 after the conversion of A/D converter 115, finally leads to
Cross GPRS module 301 and monitoring result is sent to pernicious gas remote monitoring computer.302
Multiple gases can be realized by above-mentioned harmful gas concentration detecting system and its detection method：As CO, HCl, CH4,
NH3, H2S, HCN, C2H2, C2H4 etc. automatic detection, 0~2000ppm of measurement range；Measurement lower limit reaches：100ppb.
The beneficial effect of harmful gas concentration detecting system and its detection method of the present invention is：
Make use of GPRS nets wide coverage, message transmission rate are high, always online, expense is low, without territory restriction, save it is huge
The advantages such as volume networking expense, solve atmosphere pollution it is a wide range of, real-time, monitor problem on-line for a long time；
Using TDLAS spectrum detection techniques to have in harmful gas concentration detection, precision is higher, selectivity is strong and may be implemented in
The advantages of line continuous monitoring；
System employs ARM embeded processors, real-time is good, can offline operation, easy to carry, except for atmospheric environment
Monitoring, it is also extrapolated to the hazardous gas detection of the industries such as chemical industry, electric power, mine.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, it is included within the scope of the present invention.
Claims (9)
- A kind of 1. harmful gas concentration detecting system, it is characterised in that including：Pernicious gas detection part, arm processor and GPRS remote monitorings part,Wherein pernicious gas detection part includes LD drivers, diode laser, multi-optical path absorption pond, photoelectric detector, light Electric modular converter, preamplifier, lock-in amplifier and data acquisition and control module and A/D converter,GPRS remote monitorings part includes GPRS module and pernicious gas remote monitoring computer,The input of the output end connection diode laser of LD drivers, the output end of diode laser are connected by collimater Connect multi-optical path absorption pond, the input of the output end connection photoelectric detector in multi-optical path absorption pond, the output end of photoelectric detector Connect the input of photoelectric conversion module, the input of the output end connection preamplifier of photoelectric conversion module, preposition amplification The input of the output end connection lock-in amplifier of device, the output end connection data acquisition of lock-in amplifier and control module, number A/D converter is connected with control module according to collection,The input of the output end connection arm processor of A/D converter, the output end connection GPRS module of arm processor, GPRS Module connects pernicious gas remote monitoring computer.
- 2. harmful gas concentration detecting system according to claim 1, it is characterised in that LD drivers are directly connected to signal Source, and for providing temperature and electric current needed for work to diode laser, then modulating signal source produces modulated signal.
- 3. harmful gas concentration detecting system according to claim 1, it is characterised in that the output end of diode laser On be connected with optical splitter, the output end of optical splitter is respectively connecting to the first detector, the second detector and photoelectric detector.
- 4. harmful gas concentration detecting system according to claim 3, it is characterised in that optical splitter is by diode laser Output light be divided into three parts, respectively first via light, the second road light and the 3rd road light, first via light, the second road light and the 3rd Road light is separately input into the first detector, the second detector and photoelectric detector.
- 5. harmful gas concentration detecting system according to claim 4, it is characterised in that first via light is directly entered first Detector, for determining laser intensity and monitoring lasing light emitter.
- 6. harmful gas concentration detecting system according to claim 4, it is characterised in that optical splitter and the second detector it Between be provided with built-in reference cell, the second road light is by entering the second detector after built-in reference cell, for determining the work of monitoring system Make zero point, realize the self-calibration of detecting system.
- 7. harmful gas concentration detecting system according to claim 4, it is characterised in that the 3rd road light passes through to be passed by optical cable Collimater is transported to, multi-optical path absorption pond is entered after collimating device collimation and passes through the tested gas in tested gas pipeline, so Photoelectric detector is absorbed afterwards, then is converted into electric signal by photoelectric conversion module, and gas concentration is obtained after subsequent treatment.
- 8. harmful gas concentration detecting system according to claim 2, it is characterised in that diode laser modulates electric current Including two parts：Direct current is modulated into saw-tooth current and carries out wave spectrum frequency modulation again on the basis of sawtooth current.
- 9. the detection method of the harmful gas concentration detecting system according to any one of claim 1 ~ 8, it is characterised in that bag Include following steps：A, that the trace contamination gas in atmospheric environment is passed through into multi-optical path absorption pond etc. is to be detected；B, temperature and electric current as needed for LD drivers provide diode laser work, modulating signal source produce modulated signal, and Diode laser is supplied to by LD drivers the tuning of laser is exported to it to realize；C, multi-optical path absorption pond is incided after the tuning laser collimator collimation of diode laser output, in multi-optical path absorption Through multiple reflections and after sample gas absorbs in pond, output light is received by photoelectric detector again；D, the optical signal for carrying gas absorption information is converted to electric signal by photoelectric detector by photoelectric conversion module, before Put after amplifier carries out primary amplification to the signal, then harmonic detecting, the ginseng of lock-in amplifier are carried out to it by lock-in amplifier Signal is examined to be produced by modulating signal source；E, the analog signal of lock-in amplifier output is sent to arm processor after A/D converter is changed, finally by GPRS module Monitoring result is sent to pernicious gas remote monitoring computer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507737A (en) * | 2018-03-01 | 2018-09-07 | 中国标准化研究院 | Natural gas station leakage monitor |
| CN109975242A (en) * | 2019-05-05 | 2019-07-05 | 四川省生态环境科学研究院 | A kind of the on-board emission test system and its working method of motor vehicle ammonia |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109701A (en) * | 2007-07-30 | 2008-01-23 | 天津大学 | On-line detecting method and apparatus for multi-component gas |
| CN201081762Y (en) * | 2008-01-24 | 2008-07-02 | 潘连富 | Multi-component laser online gas analyzer |
| CN103439291A (en) * | 2013-08-09 | 2013-12-11 | 国家安全生产监督管理总局通信信息中心 | Distributed optical fiber methane monitoring system based on TDLAS (tunable diode laser absorption spectroscopy) |
| CN104020114A (en) * | 2014-05-23 | 2014-09-03 | 中国人民解放军海军医学研究所 | Method for analyzing trace concentration of ammonia gas |
| CN204203091U (en) * | 2013-12-20 | 2015-03-11 | 合肥科大立安安全技术股份有限公司 | Optical fiber combustible and poisonous gas detection system |
| CN104568834A (en) * | 2015-01-08 | 2015-04-29 | 天津大学 | TDLAS-based ammonia gas detection experiment system |
| CN204679416U (en) * | 2015-06-08 | 2015-09-30 | 武汉新烽光电科技有限公司 | A kind of drainage pipeline networks On-Line Monitor Device of Gas based on TDLAS |
| CN204758480U (en) * | 2015-04-21 | 2015-11-11 | 常州杰泰克节能科技有限公司 | Harmful gas monitoring system based on TDLAS and GPRS technique |
| CN205840917U (en) * | 2016-08-09 | 2016-12-28 | 武汉新烽光电股份有限公司 | A kind of mine gas wireless monitor system based on TDLAS sensor |
| CN106442403A (en) * | 2016-09-07 | 2017-02-22 | 天津大学 | Spectrum detection system for diesel SCR ammonia pollution |
| CN207318347U (en) * | 2017-09-11 | 2018-05-04 | 常州杰泰克节能科技有限公司 | Harmful gas concentration detecting system |
-
2017
- 2017-09-11 CN CN201710809870.7A patent/CN107478600A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109701A (en) * | 2007-07-30 | 2008-01-23 | 天津大学 | On-line detecting method and apparatus for multi-component gas |
| CN201081762Y (en) * | 2008-01-24 | 2008-07-02 | 潘连富 | Multi-component laser online gas analyzer |
| CN103439291A (en) * | 2013-08-09 | 2013-12-11 | 国家安全生产监督管理总局通信信息中心 | Distributed optical fiber methane monitoring system based on TDLAS (tunable diode laser absorption spectroscopy) |
| CN204203091U (en) * | 2013-12-20 | 2015-03-11 | 合肥科大立安安全技术股份有限公司 | Optical fiber combustible and poisonous gas detection system |
| CN104020114A (en) * | 2014-05-23 | 2014-09-03 | 中国人民解放军海军医学研究所 | Method for analyzing trace concentration of ammonia gas |
| CN104568834A (en) * | 2015-01-08 | 2015-04-29 | 天津大学 | TDLAS-based ammonia gas detection experiment system |
| CN204758480U (en) * | 2015-04-21 | 2015-11-11 | 常州杰泰克节能科技有限公司 | Harmful gas monitoring system based on TDLAS and GPRS technique |
| CN204679416U (en) * | 2015-06-08 | 2015-09-30 | 武汉新烽光电科技有限公司 | A kind of drainage pipeline networks On-Line Monitor Device of Gas based on TDLAS |
| CN205840917U (en) * | 2016-08-09 | 2016-12-28 | 武汉新烽光电股份有限公司 | A kind of mine gas wireless monitor system based on TDLAS sensor |
| CN106442403A (en) * | 2016-09-07 | 2017-02-22 | 天津大学 | Spectrum detection system for diesel SCR ammonia pollution |
| CN207318347U (en) * | 2017-09-11 | 2018-05-04 | 常州杰泰克节能科技有限公司 | Harmful gas concentration detecting system |
Non-Patent Citations (2)
| Title |
|---|
| 窦贺鑫: "基于TDLAS技术的在线气体检测***评介", 现代仪器, pages 53 * |
| 窦贺鑫: "基于TDLAS的气体在线检测***研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, no. 04, pages 8 - 39 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507737A (en) * | 2018-03-01 | 2018-09-07 | 中国标准化研究院 | Natural gas station leakage monitor |
| CN109975242A (en) * | 2019-05-05 | 2019-07-05 | 四川省生态环境科学研究院 | A kind of the on-board emission test system and its working method of motor vehicle ammonia |
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