CN205719923U - Self-calibration air-breathing laser methane full-scale detection device - Google Patents
Self-calibration air-breathing laser methane full-scale detection device Download PDFInfo
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- CN205719923U CN205719923U CN201620567754.XU CN201620567754U CN205719923U CN 205719923 U CN205719923 U CN 205719923U CN 201620567754 U CN201620567754 U CN 201620567754U CN 205719923 U CN205719923 U CN 205719923U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 230000003750 conditioning effect Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 31
- 238000005259 measurement Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000001285 laser absorption spectroscopy Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000203069 Archaea Species 0.000 description 1
- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model discloses a from demarcation formula of breathing in laser methane full scale detection device, the device adopt the formula of breathing in mode, utilize the aspirator pump will reveal methane gas suction to detection device, realize gas concentration detection. The self-calibration device utilizes the beam splitter to split the single laser beam, the transmitted beam passes through the system integrated gas calibration pool and is received by the detector to complete photoelectric conversion, and the transmitted beam passes through the signal conditioning circuit and the data acquisition circuit to lock the central wavelength of the laser. The light beam reflected by the first light splitting sheet passes through the multiple reflection pool, the effective optical path is increased, and the light beam is finally received by the detector, so that the low concentration detection of the methane gas is realized, and the second light splitting sheet is integrated in the multiple reflection pool, so that the high concentration detection of the methane gas is realized.
Description
Technical field
The utility model relates to laser methane field of gas detection, full particularly to a kind of self-calibration Air-breathing Laser Propulsion methane
Range detects device.
Background technology
With a large amount of development and utilizations of the energy, methane gas is increasing on the work of resident and the impact of life.Companion
Universal with China's combustion gas to family engineering, the personnel, the loss event of property that cause because of gas leakage in burning line increase increasingly
Many.Government, enterprise and the society pay attention to day by day to gas pipeline safety and environmental protection, the safety patrol inspection of gas pipeline, especially let out
Missing inspection is surveyed and is increasingly seemed important.
In the gas sensor of certain gas pipeline leakage detection, semiconductor transducer is in the majority, but it generally has
Response time length, easily poisoning and easily by shortcomings such as other gas interference.In recent years, laser absorption spectroscopy obtains widely should
With laser instrument detection concentration of methane gas has become as a kind of trend.Therefore it is highly desirable to develop a kind of response time short, no
The easily highly sensitive methane gas detection device of poisoning.
Content of the invention
The purpose of this utility model is to provide a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device, solves mesh
The laser center wavelength that the temperature drift phenomenon being widely present in the detection application of front laser absorption spectroscopy gas concentration causes is not
Enough stable, and measurement range ability and LDL be difficult to the problems such as the contradiction taken into account.
The utility model adopts the following technical scheme that realization: a kind of self-calibration Air-breathing Laser Propulsion methane full scale detects
Device, including the data acquisition and procession mainboard of the integrated LCD of a data show interface and by laser instrument drive mainboard drive
Dynamic laser instrument, the emitting light path of laser instrument is sequentially provided with collimater and the first light splitting piece, the transmitted light path of the first light splitting piece
On be sequentially provided with gas pond and the 3rd detector；The reflected light path of the first light splitting piece is provided with in multiple reflecting pool, described repeatedly
Reflection tank is provided with intake interface and interface of giving vent to anger；Intake interface is connected with asepwirator pump by air induction hose, and air induction hose concatenates
There is filter；The emitting light path of multiple reflecting pool is provided with the second detector；The signal of the second detector and the 3rd detector is defeated
Go out end to be connected with the signal input part of data acquisition and procession mainboard；The signal output part of data acquisition and procession mainboard with swash
Light device drives the Control of Voltage port of mainboard and the control end of asepwirator pump to be connected.
The second light splitting piece being provided with inside multiple reflecting pool on the reflected light path being positioned at the first light splitting piece；Outside multiple reflecting pool
Side is provided with the first detector, the signal output part of the first detector and data acquisition and place on the reflected light path of the second light splitting piece
The signal input part of reason mainboard is connected.
First detector is connected with data acquisition and procession mainboard by the first signal conditioning circuit；Second detector leads to
Cross secondary signal modulate circuit to be connected with data acquisition and procession mainboard；3rd detector by the 3rd signal conditioning circuit with
Data acquisition and procession mainboard is connected.
Data acquisition and procession mainboard is also integrated with acoustic-optic alarm.The interface of giving vent to anger of multiple reflecting pool is connected with gives vent to anger
Flexible pipe, the air-out hose port of export drives mainboard close to data acquisition and procession mainboard and laser instrument.
Laser instrument drives mainboard, laser instrument and collimater composition laser element；Inhaling hose, asepwirator pump, air-out hose,
Filter forms suction system；First light splitting piece, the 3rd detector and the 3rd signal conditioning circuit, gas pond composition self-calibration system
System；Reflection tank detector unit includes multiple reflecting pool, filter, the first detector, the first signal conditioning circuit, the second detection
Device, secondary signal modulate circuit；Data acquisition and processing system includes being integrated with acoustic-optic alarm and data display LCD interface
Data acquisition and procession mainboard；Described laser element is mainly driven mainboard to ensure that laser stabilization goes out light by laser instrument, logical
Cross pre-collimator collimation, incide on the first light splitting piece.Suction system passes through asepwirator pump and flexible pipe by gas suction to be measured extremely
Reflection tank detector unit, described filter effect is effectively to prevent dust, impurity and water to enter inside multiple reflecting pool,
Prevent from polluting eyeglass.The light beam of the first light splitting piece transmission is received by a detector behind gas pond, is converted into the signal of telecommunication, Jing Guoxin
Number modulate circuit is sent to system board data acquisition process.An integrated second little light splitting piece in multiple reflecting pool,
When detecting low concentration, utilize the light of the second light splitting piece transmission multiple reflections in reflection tank, increase effective light path, visited by second
Survey device to receive, retransmit to data acquisition and procession motherboard circuit；When detecting high concentration, multiple reflections structure is used to easily cause
Signal is saturated, and the reflection light hence with light splitting piece detects, and receives reflection light by the first detector and completes opto-electronic conversion,
It is then forwarded to data acquisition process, complete high concentration detection.
Multiple reflecting pool is provided with two level crossings on its two relative inwalls: frontal plane mirror and back plane mirror, it is ensured that
Enter laser outgoing after multiple reflections of multiple reflecting pool.
Described self-calibration system, its theoretical foundation is:
In laser absorption spectrum detection technique, needing to use semiconductor laser as light source, its performance indications are main
Depend on temperature and current parameters.When ambient temperature changes greatly, the centre wavelength drift of laser instrument can be very serious, very
To the sweep limits leaving laser instrument, cause measurement that error occurs.By increasing by one by the mark of fixed concentration in internal system
Gas pond and corresponding detection process part, carry out the locking wire of laser wavelength, it is ensured that system is reliable stable.
Full scale detection technique described in the utility model, its theoretical foundation is:
In order to improve sensitivity during gas concentration detection, generally require and select stronger gaseous absorption line, but this is just
Define the contradiction between LDL and range.As a example by methane gas, utilize gas molecule laser spectrum absorption techniques
When realizing that high concentrations of gas detects, strong methane gas absorption can make absorption line signal saturated, causes the measured value can not
As the increase of concentration continues to raise, range is restricted.Therefore, in conjunction with described reflection tank mechanical-optical setup, arrange in the algorithm
Strong Absorption Line peak value saturation threshold value, for different high-concentration and low-concentration gases to be measured, uses different light paths reflection receivable, it is achieved just
Concentration Testing freely switches, and while ensureing certainty of measurement, promotes measurement range ability and reaches 0-100%.
The utility model solves the temperature drift being widely present in the detection application of current laser absorption spectroscopy gas concentration
The laser center wavelength that phenomenon causes is not sufficiently stable, and measurement range ability and LDL are difficult to the contradiction etc. taken into account
Problem, it is ensured that laser center wavelength is stable, improves detection accuracy, and ensure that laser methane measurement of concetration is minimum
Measurement of concetration scope is improve while detection limit.
Brief description
Fig. 1 is a kind of self-calibration Air-breathing Laser Propulsion CH_4 detection apparatus structure schematic diagram described in the utility model.
1-data acquisition and procession mainboard, 2-laser instrument driving mainboard, 3-laser instrument, 4-collimater, 5-the first light splitting piece,
6-multiple reflecting pool, 7-frontal plane mirror, 8-back plane mirror, 9-gas pond, 10-the 3rd signal conditioning circuit, 11-first detects
Device, 12-the first signal conditioning circuit, 13-the second detector, 14-secondary signal modulate circuit, 15-the second light splitting piece, 16-goes out
Gas flexible pipe, 17-asepwirator pump, 18-inhaling hose, 19-filter, 20-intake interface, 21-gives vent to anger interface, and 22-data show LCD
Interface, 23-acoustic-optic alarm, 24-light beam, 24A-first reflects light beam, 24B-the first transmitted light beam, 24C-the second transmission light
Bundle, 24D-second reflects light beam, 25-the 3rd detector.
Detailed description of the invention
Light beam 24 collimates through collimater 4, incides the first reflection light of the first light splitting piece 5 reflection on the first light splitting piece 5
Bundle 24A by above frontal plane mirror 7 space enter multiple reflecting pool 6, again by the second light splitting piece 15 be divided into the second transmitted light beam 24C and
Second reflection light beam 24D；Second transmitted light beam 24C in multiple reflecting pool 6 after multiple reflections by the lower section of frontal plane mirror 7
Space outgoing, after being gathered by the second detector 13 and be converted into the corresponding signal of telecommunication through secondary signal modulate circuit 14 input to
Data acquisition and procession mainboard 1 is processed, and obtains the testing result of low concentration；Second reflection light beam 24D is by the first detector
Input to data acquisition and procession mainboard 1 through the first signal conditioning circuit 12 after gathering and being converted into the corresponding signal of telecommunication and carry out
Process, obtain the testing result of high concentration；Through the first transmitted light beam 24B of the first light splitting piece 5 transmission behind gas pond 9 by
Three detectors 25 input to data acquisition and place through the 3rd signal conditioning circuit 10 after gathering and being converted into the corresponding signal of telecommunication
Reason mainboard 1 is processed.
Described multiple reflecting pool 6 is made up of two level crossings: frontal plane mirror 7 and back plane mirror 8.By two level crossings
Realize the multiple reflections of light beam, increase the effective light path of system.On multiple reflecting pool 6, reserve intake interface 20 and given vent to anger
Interface 21, facilitates external inhaling hose 18, air-out hose 16.
Detection device described in the utility model uses air suction type mode, by methane oxidizing archaea gas suction to multiple reflecting pool
Detect in 6.Controlled the unlatching of asepwirator pump 17 by data acquisition and procession mainboard 1, in order to adapt to different sample rates
Requiring and reduce the possibility that gas is diluted, asepwirator pump 17 is exported modulated signal by data acquisition and procession mainboard 1 and controls two kinds
Speed: speed 1 and speed 2.Gas leakage reaches filter 19 through inhaling hose 18, and its effect effectively prevents dust,
It is internal that impurity and water enter multiple reflecting pool 6, prevents from polluting eyeglass.Entered repeatedly anti-by the gas after filtering from intake interface 20
Penetrate in pond, by after multiple reflecting pool from interface 21 of giving vent to anger, discharge through air-out hose 16.
In order to improve system radiating, exhaust outlet drives mainboard 2 close to data acquisition and procession mainboard 1 and laser instrument,
Utilize air-flow to dispel the heat heat generating components, improve system radiating efficiency.
A kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device described in the utility model, solves current laser
The laser center wavelength that the temperature drift phenomenon being widely present in the detection application of absorption spectroscopy techniques gas concentration causes is not sufficiently stable,
And measurement range ability and LDL are difficult to the problems such as the contradiction taken into account, it is ensured that laser center wavelength is stable, carries
High detection accuracy, and improve measurement of concetration scope while ensure that laser methane measurement of concetration LDL.
Claims (9)
1. self-calibration Air-breathing Laser Propulsion methane full scale detection device, it is characterised in that: include that one is integrated with data and shows
Show the data acquisition and procession mainboard (1) of LCD interface (22) and the laser instrument (3) being driven mainboard (2) to drive by laser instrument, swash
It is sequentially provided with collimater (4) and the first light splitting piece (5), on the transmitted light path of the first light splitting piece (5) on the emitting light path of light device (3)
It is sequentially provided with gas pond (9) and the 3rd detector (25)；The reflected light path of the first light splitting piece (5) is provided with multiple reflecting pool (6),
Described multiple reflecting pool (6) is provided with intake interface (20) and interface of giving vent to anger (21)；Intake interface (20) passes through inhaling hose
(18) being connected with asepwirator pump (17), inhaling hose (18) is serially connected with filter (19)；Set on the emitting light path of multiple reflecting pool (6)
There is the second detector (13)；The signal output part of the second detector (13) and the 3rd detector (25) and data acquisition and procession master
The signal input part of plate (1) is connected；The signal output part of data acquisition and procession mainboard (1) drives mainboard (2) with laser instrument
Control of Voltage port and the control end of asepwirator pump (17) be connected.
2. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 1, it is characterised in that: repeatedly
Internal the second light splitting piece (15) being provided with on the reflected light path being positioned at the first light splitting piece (5) of reflection tank (6)；Multiple reflecting pool (6)
Outside is provided with the first detector (11), the signal output part of the first detector (11) on the reflected light path of the second light splitting piece (15)
It is connected with the signal input part of data acquisition and procession mainboard (1).
3. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 1 or 2, it is characterised in that:
Multiple reflecting pool (6) is provided with two level crossings on its two relative inwalls: frontal plane mirror (7) and back plane mirror (8), it is ensured that
Enter laser outgoing after multiple reflections of multiple reflecting pool (6).
4. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 2, it is characterised in that: first
Detector (11) is connected with data acquisition and procession mainboard (1) by the first signal conditioning circuit (12)；Second detector
(13) it is connected with data acquisition and procession mainboard (1) by secondary signal modulate circuit (14)；3rd detector (25) passes through
3rd signal conditioning circuit (10) is connected with data acquisition and procession mainboard (1).
5. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 1 or 2, it is characterised in that:
Data acquisition and procession mainboard (1) is also integrated with acoustic-optic alarm (23).
6. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 3, it is characterised in that: data
Gather and be also integrated with acoustic-optic alarm (23) with processing main plate (1).
7. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 1 or 2, it is characterised in that:
The interface of giving vent to anger (21) of multiple reflecting pool (6) is connected with air-out hose (16), and air-out hose (16) port of export is near data acquisition
Drive mainboard (2) with processing main plate (1) and laser instrument.
8. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 3, it is characterised in that: repeatedly
The interface of giving vent to anger (21) of reflection tank (6) is connected with air-out hose (16), and air-out hose (16) port of export is near data acquisition and place
Reason mainboard (1) and laser instrument drive mainboard (2).
9. a kind of self-calibration Air-breathing Laser Propulsion methane full scale detection device as claimed in claim 5, it is characterised in that: repeatedly
The interface of giving vent to anger (21) of reflection tank (6) is connected with air-out hose (16), air-out hose (16) port of export close to data acquisition with
Processing main plate (1) and laser instrument drive mainboard (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620567754.XU CN205719923U (en) | 2016-06-13 | 2016-06-13 | Self-calibration air-breathing laser methane full-scale detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620567754.XU CN205719923U (en) | 2016-06-13 | 2016-06-13 | Self-calibration air-breathing laser methane full-scale detection device |
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| Publication Number | Publication Date |
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| CN205719923U true CN205719923U (en) | 2016-11-23 |
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| CN201620567754.XU Expired - Fee Related CN205719923U (en) | 2016-06-13 | 2016-06-13 | Self-calibration air-breathing laser methane full-scale detection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389604A (en) * | 2017-06-26 | 2017-11-24 | 中国科学院光电研究院 | A kind of laser, which declines, swings detection method |
| 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 |
| CN109856078A (en) * | 2019-01-16 | 2019-06-07 | 深圳供电局有限公司 | Optical gas detection system |
| CN110568126A (en) * | 2019-09-11 | 2019-12-13 | 任启兰 | Methane sensor |
| CN111766220A (en) * | 2020-07-28 | 2020-10-13 | 中煤科工集团重庆研究院有限公司 | Methane gas detection photoelectric detection module and detection device |
| CN112213284A (en) * | 2020-09-21 | 2021-01-12 | 西安智光物联科技有限公司 | Self-calibration method of natural gas detector |
-
2016
- 2016-06-13 CN CN201620567754.XU patent/CN205719923U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389604A (en) * | 2017-06-26 | 2017-11-24 | 中国科学院光电研究院 | A kind of laser, which declines, swings detection method |
| CN107389604B (en) * | 2017-06-26 | 2019-08-20 | 中国科学院光电研究院 | A kind of laser, which declines, swings detection method |
| 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 |
| CN109856078A (en) * | 2019-01-16 | 2019-06-07 | 深圳供电局有限公司 | Optical gas detection system |
| CN110568126A (en) * | 2019-09-11 | 2019-12-13 | 任启兰 | Methane sensor |
| CN111766220A (en) * | 2020-07-28 | 2020-10-13 | 中煤科工集团重庆研究院有限公司 | Methane gas detection photoelectric detection module and detection device |
| CN112213284A (en) * | 2020-09-21 | 2021-01-12 | 西安智光物联科技有限公司 | Self-calibration method of natural gas detector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20210613 |
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| CF01 | Termination of patent right due to non-payment of annual fee |