CN206710305U - A kind of in-situ type laser gas analyzer based on TDLAS technologies - Google Patents
A kind of in-situ type laser gas analyzer based on TDLAS technologies Download PDFInfo
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- CN206710305U CN206710305U CN201720427942.7U CN201720427942U CN206710305U CN 206710305 U CN206710305 U CN 206710305U CN 201720427942 U CN201720427942 U CN 201720427942U CN 206710305 U CN206710305 U CN 206710305U
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- laser
- receiving unit
- link block
- gas analyzer
- transmitter unit
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 19
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 title claims abstract description 17
- 238000005516 engineering process Methods 0.000 title claims description 15
- 238000010926 purge Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 210000000481 breast Anatomy 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a kind of in-situ type laser gas analyzer based on TDLAS, including：Transmitter unit, reference cell, receiving unit, explosion-proof connection box, transmitter unit link block, receiving unit link block and purging unit, the transmitter unit is interior to contain laser module, laser driving circuit plate and laser temperature control panel, lens and protection window；The reference cell contains speculum, reference measurement pond and photoelectric detector and signal processing circuit board；The receiving unit contains photodiode, lens and signal processing circuit board；The explosion-proof connection box contains I/O interfaces；The transmitter unit link block and receiving unit link block contain welded flange, root valve and instrument flange respectively.The utility model is arranged on calibration gas room and can carry out on-line proving again without receiving unit and transmitter unit be dismantled from flange, and it is simple in construction, reliability is high, easy to operate and stated accuracy is high.
Description
Technical field
The utility model belongs to laser spectrum absorption techniques detection field, and in particular to a kind of in-situ type based on TDLAS
Laser gas analyzer.
Background technology
Based on tunable diode laser absorption spectroscopy（TDLAS）The laser gas analyzer of technology, using vertical cavity surface
Emitting laser（VCSEL）Or distributed feedback laser（DFB）As tunable laser source, pass through triangular wave or sawtooth waveforms
The absorption line of the tested gas of scanning.By obtaining the optic spectrum line information of under test gas characteristic absorption, so as to which what is carried out quantifies
Analysis.
Laser gas analyzer can use the in site measurement mode that need not sample pretreatment, to being tested gas in sample gas component
Body content carries out quick, accurate and reliable measurement.But with much time using, laser gas analyzer is due to laser
The reason for device, photoelectric detector or circuit etc., it may appear that drift about so as to cause measured deviation excessive.It is at this time, it may be necessary to right
Laser gas analyzer carries out zero point correction and range calibration.Current in-situ type laser gas analyzer calibrating mode use from
Line calibrating mode, i.e.,：The receiving unit of laser gas analyzer and transmitter unit are disassembled from chimney breast both sides, torn open
Scavenging pipeline, power cable and signal cable are also dismantled while unloading both ends, then is carried out offline on calibration gas room
Ventilation calibration（As shown in Figure 3）.After the completion of off-line calibration, then receiving unit and transmitter unit installed back on chimney breast, should
Calibration method is wasted time and energy, and calibration process is cumbersome, efficiency is low.
Utility model content
The utility model is in order to solve defect present in above-mentioned prior art and deficiency, there is provided a kind of without that will receive
Unit and transmitter unit are dismantled from flange can carry out on-line proving installed in calibration gas room again, and simple in construction, reliable
A kind of high, the easy to operate and high stated accuracy in-situ type laser gas analyzer of property.
The technical solution of the utility model：A kind of in-situ type laser gas analyzer based on TDLAS technologies, including：Hair
It is single to penetrate unit, reference cell, receiving unit, explosion-proof connection box, transmitter unit link block, receiving unit link block and purging
Member, the transmitter unit is interior to contain laser module, laser driving circuit plate and laser temperature control panel, lens and protection
Window；The reference cell contains speculum, reference measurement pond and photoelectric detector and signal processing circuit board；The reception
Unit contains photodiode, lens and signal processing circuit board；The explosion-proof connection box contains I/O interfaces；The transmitting
Unit link block and receiving unit link block contain welded flange, root valve and instrument flange respectively.
Preferably, the transmitter unit includes number of lasers as one, using VCSEL lasers or Distributed Feedback Laser,
Triangular signal caused by frequency generating circuit and sine wave signal are superimposed upon in laser drive current, to semiconductor laser
Device output wavelength is scanned and modulated.
Preferably, the reference cell includes photoelectric detector one, by the way that collimation laser is divided into two-way, is used for all the way
Measurement, another way are calibrated for reference.
Preferably, the receiving unit includes photoelectric detector one, and the modulated optical signal of reception is converted into electric signal,
And output electric signal is obtained into second harmonic signal by the synchronous detection of lock-in amplifier, then second harmonic information is converted into
Concentration information.
Preferably,：Contain input/output signal interface in the explosion-proof connection box, facilitate user's access power supply signal and
To picking out 4 ~ 20mA output signals, 4 ~ 20mA input signals and switching value output signal.
Preferably, the receiving unit is arranged on chimney breast side by receiving unit link block, and the transmitting is single
Member is arranged on chimney breast opposite side by transmitter unit link block, and transmitter unit link block connects mould with receiving unit
Optical path adjusting bolt is respectively provided with block, light path can be adjusted.
Preferably, filter, pressure-reducing valve and constant-current stabilizer are contained in the purging unit, to purge gas pressure and flow
It is controlled, ensures that laser gas analyzer window is not contaminated.
Preferably, it is additionally provided with rain-proof shell outside the purging unit.
The utility model can by the laser of modulation by being divided into two-way after collimation lens, all the way for gasmetry,
It is used to reference all the way calibrate.By the absorption relation between gas characteristic spectral line between reference air chamber and calibration gas chamber, so as to complete
Into on-line proving.
The utility model is swashed using a sublaser and two photoelectric detectors, the laser using vertical-cavity surface-emitting
Light device or distributed feedback laser.
Laser temperature-controlled portion contains thermistor and semiconductor TEC refrigerators, and thermistor is as laser works temperature
The sensing element of degree, feedback laser operating temperature state, semiconductor TEC refrigerators are according to the temperature that thermistor feeds back to swashing
Light device is heated or freezed.So that laser works in certain temperature range, ensure temperature-controlled precision.Two photoelectricity inspections
Survey device to be separately mounted in reference air chamber and receiving unit, electric signal is converted to the modulated optical signal received.
Wherein, the laser that laser is sent is divided into two-way after collimation lens, is connect all the way according to the collimation injection of former road
Receiving end, another way are reflected into reference air chamber.
The utility model is arranged on calibration gas room again without receiving unit and transmitter unit are dismantled from flange
Carry out on-line proving, and it is simple in construction, reliability is high, easy to operate, it is offline to solve current in-situ type laser gas analyzer
That calibrates is cumbersome, improves calibration efficiency, calibration result accuracy is good.
Brief description of the drawings
Fig. 1 is the utility model in-site measurement schematic diagram；
Fig. 2 is on-line proving reference cell light path schematic diagram in the utility model；
Fig. 3 is that schematic diagram is calibrated in the offline ventilation of in-situ type laser gas analyzer；
1, transmitter unit in Fig. 1,2, transmitter unit link block, 3, receiving unit link block, 4, receiving unit, 5, blow
Sweep unit, 6, explosion-proof connection box；
1, laser in Fig. 2,2, collimation lens, 3, speculum a, 4, speculum b, 5, speculum c, 6, speculum d, 7, meeting
Poly- lens, 8, photoelectric detector；
1, transmitter unit in Fig. 3,2, gas exhaust piping, 3, pipe joint, 4, calibration gas room, 5, receiving unit, 6, gas
Pipeline, 7, gas bottle, 8, transmitting-receiving cable, 9 gas compartment supports.
Embodiment
The utility model is described in further detail with the course of work below in conjunction with the accompanying drawings, but is not to this practicality
The limitation of novel protected scope.
As shown in figure 1, a kind of in-situ type laser gas analyzer based on TDLAS technologies, including：Transmitter unit 1, reference
Unit, receiving unit 4, explosion-proof connection box 6, transmitter unit link block 2, receiving unit link block 3 and purging unit 5.Hair
Penetrate in unit 1 containing laser module, laser driving circuit plate and laser temperature control panel, lens and protection window；Ginseng
Contain speculum, reference measurement pond and photoelectric detector and signal processing circuit board than unit；Receiving unit 4 contains photoelectricity two
Pole pipe, lens and signal processing circuit board；Explosion-proof connection box 6 contains I/O interfaces；Transmitter unit link block 2 and reception are single
First link block 3 contains welded flange, root valve and instrument flange respectively.Transmitter unit 1 includes number of lasers as one, adopts
With VCSEL lasers or Distributed Feedback Laser, triangular signal caused by frequency generating circuit and sine wave signal are superimposed upon sharp
In light device driving current, noise spectra of semiconductor lasers output wavelength is scanned and modulated.Reference cell is used to be divided and will divided
The collimation laser gone out is transferred in reference air chamber, and receives the fraction of laser light, wherein reference list by reference air chamber photoelectric detector
Embedding tank containing the tested gas of sealing in member；Reference cell includes photoelectric detector one, by the way that collimation laser is divided into two
Road, it is used to measure all the way, another way is calibrated for reference.Receiving unit 4 includes photoelectric detector one, by the modulation light of reception
Signal is converted to electric signal, and output electric signal is obtained into second harmonic signal by the synchronous detection of lock-in amplifier, then will
Second harmonic information is converted into concentration information.Contain input/output signal interface in explosion-proof connection box 6, facilitate user to access power supply
Signal and to picking out 4 ~ 20mA output signals, 4 ~ 20mA input signals and switching value output signal.Receiving unit 4 passes through
Receiving unit link block 3 is arranged on chimney breast side, and transmitter unit 1 is arranged on chimney by transmitter unit link block 2
Pipeline opposite side, and optical path adjusting bolt is respectively provided with transmitter unit link block 2 and receiving unit link block 3, can be right
Light path is adjusted.Contain filter, pressure-reducing valve and constant-current stabilizer in purging unit 5, purge gas pressure and flow are carried out
Control, ensure that laser gas analyzer window is not contaminated.Rain-proof shell is additionally provided with outside purging unit 5.
As shown in Fig. 2 reference light paths after laser 1 is sent, pass sequentially through collimation lens 2, speculum a3, speculum
B4, speculum c5, speculum d6 and convergent lens 7, finally converge to photoelectric detector 8；
Contain photoelectric detector, hermetically sealed can and signal processing circuit board inside reference cell, signal processing circuit board will be adopted
Its caused second harmonic information transfer by Photoelectric Detection of collection is entered second harmonic information on receiving terminal mainboard, receiving mainboard
Row processing, and carry out corresponding calibration factor calculating and storage.
On-line proving process of the present utility model is as follows：
Select suitable modulation parameter, laser output wavelength can carry out tested gasmetry, reference air chamber and normal
Laser parameter during measurement is consistent；
Before on-line proving, it has been determined that reference air chamber and calibration gas chamber gas absorb between relation.Gas absorb with it is dense
Degree, temperature, pressure, light path and spectral line line style are relevant.Finite concentration gas is sealed in known reference air chamber and absorbs V1(X,P,T,L,
φ) V is absorbed with being passed through finite concentration gas in calibration gas chamber2Proportionate relationship V between (X, P, T, L, φ)2/V1=C.When online
During demarcation, gas absorption signal V in reference air chamber can be obtained1, according to V2=V1* C, it may be determined that now corresponding to off-line calibration air chamber
Gas absorbs V2Signal, according to the calibration formula write in software, so that it is determined that range calibration coefficient；
Calibration formula
The online calibration method is convenient, fast, when suspecting that deviation occur in apparatus measures, no longer by receiving unit and transmitting
Unit disassembles from flange, is operated by man-machine interface and carries out on-line proving.Therefore on-line proving side of the present utility model
Method solves the cumbersome of in-situ type laser gas analyzer off-line calibration, improves calibration efficiency, and calibration result accuracy is good.
The utility model can also realize online wave length shift compensation function in addition to it can realize on-line proving function.
After laser gas analyzer long-time use, skew occurs in second harmonic central point, now by the gas to be measured of debita spissitudo
Body gas is passed through in reference air chamber, you can under test gas second harmonic information is obtained, so that it is determined that offset, by changing laser
Device modulates electric current or operating temperature, completes either automatically or manually online wave length shift compensation, is permitting second harmonic central point
Perhaps in the range of.
The utility model is based on TDLAS technologies, from optic-mechanical design and tested gas characteristic absorption line reference air chamber with
Functional relation between calibration gas chamber.It need to be only divided from transmitter unit by a part of collimation laser, i.e., by collimation lens
Laser be divided into two beams, a branch of to be used to measure, another beam is used for reference calibration.The laser being separated in reference air chamber passes through one
The photoelectric detector being installed in after fixed light path in reference air chamber receives.During on-line proving, without being passed through gas, instrument is automatic
According to the absorption relation between gas characteristic spectral line between reference air chamber and calibration gas chamber, so as to complete on-line proving.
Claims (8)
- A kind of 1. in-situ type laser gas analyzer based on TDLAS technologies, it is characterised in that：The laser gas analyzer bag Include：Transmitter unit, reference cell, receiving unit, explosion-proof connection box, transmitter unit link block, receiving unit link block and Unit is purged, contains laser module, laser driving circuit plate and laser temperature control panel, lens in the transmitter unit With protection window；The reference cell contains speculum, reference measurement pond and photoelectric detector and signal processing circuit board；Institute State receiving unit and contain photodiode, lens and signal processing circuit board；The explosion-proof connection box contains I/O interfaces；Institute State transmitter unit link block and receiving unit link block and contain welded flange, root valve and instrument flange respectively.
- A kind of 2. in-situ type laser gas analyzer based on TDLAS technologies according to claim 1, it is characterised in that： The transmitter unit includes number of lasers as one, using VCSEL lasers or Distributed Feedback Laser, by frequency generating circuit Caused triangular signal and sine wave signal are superimposed upon in laser drive current, and noise spectra of semiconductor lasers output wavelength is carried out Scanning and modulation.
- A kind of 3. in-situ type laser gas analyzer based on TDLAS technologies according to claim 1, it is characterised in that： The reference cell is used to be divided and the collimation laser separated is transferred in reference air chamber, and by reference air chamber Photoelectric Detection Device receives the fraction of laser light, the embedding tank containing the tested gas of sealing wherein in reference cell；Reference cell includes Photoelectric Detection Device one, by the way that collimation laser is divided into two-way, it is used to measure all the way, another way is calibrated for reference.
- A kind of 4. in-situ type laser gas analyzer based on TDLAS technologies according to claim 1, it is characterised in that： The receiving unit includes photoelectric detector one, the modulated optical signal of reception is converted into electric signal, and will export electric signal Second harmonic signal is obtained by the synchronous detection of lock-in amplifier, then second harmonic information is converted into concentration information.
- A kind of 5. in-situ type laser gas analyzer based on TDLAS technologies according to claim 1, it is characterised in that： Contain input/output signal interface in the explosion-proof connection box, facilitate user to access power supply signal and to picking out 4 ~ 20mA Output signal, 4 ~ 20mA input signals and switching value output signal.
- A kind of 6. in-situ type laser gas analyzer based on TDLAS technologies according to claim 1, it is characterised in that： The receiving unit is arranged on chimney breast side by receiving unit link block, and the transmitter unit is connected by transmitter unit Connection module is arranged on chimney breast opposite side, and light path tune is respectively provided with transmitter unit link block and receiving unit link block Bolt is saved, light path can be adjusted.
- A kind of 7. in-situ type laser gas analyzer based on TDLAS technologies according to claim 1, it is characterised in that： Contain filter, pressure-reducing valve and constant-current stabilizer in the purging unit, purge gas pressure and flow are controlled, ensure to swash Light gas analyzer window is not contaminated.
- A kind of 8. in-situ type laser gas analyzer based on TDLAS technologies according to claim 7, it is characterised in that： Rain-proof shell is additionally provided with outside the purging unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720427942.7U CN206710305U (en) | 2017-04-22 | 2017-04-22 | A kind of in-situ type laser gas analyzer based on TDLAS technologies |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720427942.7U CN206710305U (en) | 2017-04-22 | 2017-04-22 | A kind of in-situ type laser gas analyzer based on TDLAS technologies |
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| CN206710305U true CN206710305U (en) | 2017-12-05 |
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| CN201720427942.7U Expired - Fee Related CN206710305U (en) | 2017-04-22 | 2017-04-22 | A kind of in-situ type laser gas analyzer based on TDLAS technologies |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303391A (en) * | 2018-05-04 | 2018-07-20 | 杭州春来科技有限公司 | Caliberating device applied to open path |
| CN108507975A (en) * | 2018-04-17 | 2018-09-07 | 广东电网有限责任公司 | A kind of acetylene analyzer based on TDLAS technologies |
| CN109490153A (en) * | 2018-12-29 | 2019-03-19 | 杭州春来科技有限公司 | A kind of double light path laser dust instrument |
| CN110243761A (en) * | 2019-05-13 | 2019-09-17 | 清华大学 | For the in-situ type on-line measurement optical module of high-temperature and pressure pipeline middle and high concentration gas, device and system |
| CN110346315A (en) * | 2019-08-19 | 2019-10-18 | 大连世有电力科技有限公司 | A kind of flue gas measuring device |
| CN110398474A (en) * | 2018-04-25 | 2019-11-01 | 横河电机株式会社 | Gas analyzer |
| CN110907395A (en) * | 2019-12-02 | 2020-03-24 | 光钙(上海)高科技有限公司 | Direct absorption type TDLAS gas analyzer and method |
| CN112198119A (en) * | 2020-09-27 | 2021-01-08 | 西安毅达信息系统有限公司 | Gas detection system in flue gas pipeline |
| CN115290588A (en) * | 2022-10-09 | 2022-11-04 | 东营钧辰石油设备有限责任公司 | Online toxic gas detector of oil field united station based on laser technology |
| CN115684081A (en) * | 2023-01-04 | 2023-02-03 | 杭州泽天春来科技有限公司 | Laser gas analysis system |
-
2017
- 2017-04-22 CN CN201720427942.7U patent/CN206710305U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507975A (en) * | 2018-04-17 | 2018-09-07 | 广东电网有限责任公司 | A kind of acetylene analyzer based on TDLAS technologies |
| CN110398474A (en) * | 2018-04-25 | 2019-11-01 | 横河电机株式会社 | Gas analyzer |
| CN108303391A (en) * | 2018-05-04 | 2018-07-20 | 杭州春来科技有限公司 | Caliberating device applied to open path |
| CN109490153A (en) * | 2018-12-29 | 2019-03-19 | 杭州春来科技有限公司 | A kind of double light path laser dust instrument |
| CN110243761A (en) * | 2019-05-13 | 2019-09-17 | 清华大学 | For the in-situ type on-line measurement optical module of high-temperature and pressure pipeline middle and high concentration gas, device and system |
| CN110243761B (en) * | 2019-05-13 | 2024-01-30 | 清华大学 | In-situ on-line measurement optical component, device and system for high-concentration gas |
| CN110346315A (en) * | 2019-08-19 | 2019-10-18 | 大连世有电力科技有限公司 | A kind of flue gas measuring device |
| CN110907395A (en) * | 2019-12-02 | 2020-03-24 | 光钙(上海)高科技有限公司 | Direct absorption type TDLAS gas analyzer and method |
| CN112198119A (en) * | 2020-09-27 | 2021-01-08 | 西安毅达信息系统有限公司 | Gas detection system in flue gas pipeline |
| CN115290588A (en) * | 2022-10-09 | 2022-11-04 | 东营钧辰石油设备有限责任公司 | Online toxic gas detector of oil field united station based on laser technology |
| CN115684081A (en) * | 2023-01-04 | 2023-02-03 | 杭州泽天春来科技有限公司 | Laser gas analysis system |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 |