CN206074442U - A kind of pump suction type laser methane on-Line Monitor Device - Google Patents
A kind of pump suction type laser methane on-Line Monitor Device Download PDFInfo
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- CN206074442U CN206074442U CN201621125238.8U CN201621125238U CN206074442U CN 206074442 U CN206074442 U CN 206074442U CN 201621125238 U CN201621125238 U CN 201621125238U CN 206074442 U CN206074442 U CN 206074442U
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Abstract
This utility model belongs to detection technique field, and in particular to a kind of pump suction type laser methane on-Line Monitor Device for being suitable for agricultural breeding environment.Including the Distributed Feedback Laser being connected with constant current source and TEC electricity refrigerators respectively, gas absorption cell, the laser aligner, two plane of reflection mirrors being parallel to each other and photodetector in the gas absorption cell；The Distributed Feedback Laser is connected with described laser aligner by single-mode fiber, and the laser that the laser aligner sends can be received by the photodetector after described two plane of reflection mirror reflections being parallel to each other；One side wall of the gas absorption cell is provided with dust filter unit, and another side wall is connected with asepwirator pump by aspirating air pipe.Its advantage is：Gas absorption cell cavity is using the very high metal material of rustless steel or other surfaces compactness extent, and does polishing.One layer of Teflon protective layer is coated with gas path and absorption cell inner-walls of duct and can effectively reduce the impact that absorption is caused.
Description
Technical field
This utility model belongs to detection technique field, and in particular to a kind of pump suction type laser methane on-Line Monitor Device.
Background technology
Based on the gas detection method of gas molecule Spectrum Absorption Principle, the wavelength for mainly using semiconductor laser can
The narrow characteristic of tuning and spectral width, is measured by the absorbing wavelength for selecting under test gas, can be excluded outside tested gas
Gas interference, realize the quick detection of gas concentration.
Common methane on-Line Monitor Device is all to adopt electrochemical principle, gentle by the particular chemicals in electrochemistry
There is chemical reaction in the methane in body environment, produce electric current, by detecting that the current signal realizes the measurement to gas concentration.By
Operationally irreversible chemical reaction so as to produce consumption in the chemical substance in probe so that the monitoring of this principle there is
Device is shorter in this methane concentration in the agricultural breeding field higher occasion life-span, and can cause to visit under the occasion of excessive concentration
Active chemical in head fails rapidly, causes the consequence being poisoned of popping one's head in.Laser gas based on Spectrum Absorption Principle is detected
Device, as the normal working hourss of laser instrument were up to more than 5 years, while being a kind of Non-Destructive Testing, is greatly improved detection dress
The service life put, and the measurement concentration range of probe can be significantly increased.
Different from the gas detecting of electrochemical principle, the generally measurement of the gas measurement device based on Principles of Laser is limited
Gas concentration in space, only when the gas concentration in the gas concentration in environment and the confined space is equal, can just obtain
Accurate measurement result is obtained, the confined space is referred to as gas absorption cell.Due to hydrone of the methane easily easily and in air
Ammonia compound is combined to form, on a surface of an, these body surfaces include gas absorption cell inwall, reflecting optics for absorption
Group, and gas delivery conduit, and at different temperature, the degree of absorption change very greatly, therefore measurement result is accurate
Property is severely impacted.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of pump suction type laser for being suitable for agricultural breeding environment
Methane on-Line Monitor Device.This utility model is related to a kind of on-Line Monitor Device, more specifically, more particularly to a kind of pump suction type
Laser methane on-Line Monitor Device, belongs to detection technique field.The technical scheme adopted by this utility model is as follows：
A kind of pump suction type laser methane on-Line Monitor Device, including what is be connected with constant current source and TEC electricity refrigerators respectively
Distributed Feedback Laser, gas absorption cell, the laser aligner, two planes of reflection being parallel to each other in the gas absorption cell
Mirror and photodetector；The Distributed Feedback Laser is connected with described laser aligner by single-mode fiber, the laser aligner
The laser for sending can be received by the photodetector after described two plane of reflection mirror reflections being parallel to each other；It is described
One side wall of gas absorption cell is provided with dust filter unit, and another side wall is connected with asepwirator pump by aspirating air pipe.
Asepwirator pump therein, continuous to work, the gas in environment enters gas absorption cell after dust filter unit, afterwards
Discharged outside gas absorption cell by aspirating air pipe.
On the basis of above-mentioned technical proposal, this utility model can also make following improvement：
Further, described photodetector is arranged on the side wall of the gas absorption cell.
Further, the optical maser wavelength of described Distributed Feedback Laser transmitting is 1.51 microns, and (or there is obvious spectral absorption in methane
Other wavelength), operating current 35mA-50mA, output power range 1-2mW.
Further, the focal length of the laser aligner be 10cm, the angle of divergence be not more than ± 1.2 °.
Further, the gas absorption cell is made using pure stainless steel material, and inwall is polished and is coated with Teflon protective layer.
Further, the dust filter unit is made using teflon, and filter granule diameter 10-20 microns it
Between.
Further, the photodetector is made using InGaAsP materials, and 1.1～1.7 microns of response wave length scope.
Further, the plane of reflection mirror is made up of quartz material, and surface is coated with aluminium film, and the aluminium film surface is coated with one layer
Teflon protective layer.
Pump suction type laser methane on-Line Monitor Device of the present utility model, can improve the service life of probe.Gas is inhaled
Receives pond cavity is using the very high metal material of rustless steel or other surfaces compactness extent, and does polishing.On gas road
Footpath and absorption cell inner-walls of duct are coated with Teflon protective layer or other can effectively reduce the protective layer for adsorbing the impact for causing.Separately
Outward, under high velocity air state, methane molecule substantially can weaken in the adsorptivity of body surface, by adding asepwirator pump so that
Methane concentration inside and outside gas absorption cell is reached unanimously at faster speed, not only accelerates the measuring speed of the detection means,
Also reduce due to adsorbing the impact for causing.
This utility model compared with prior art, with advantages below：
(1) as a result of laser spectrum absorption process, it is to avoid longevity for being had using the sensor probe of electrochemical principle
The short problem with poisoning of life so that service life can be improved to more than 5 years.
(2) due to adopting spectral absorption technology, using the specific gas of specific wavelength detecting, not by other unrelated gases
Interference, particularly do not improved accuracy by the aqueous vapor interference in air.
(3) process to the making material and interior surface of gas absorption cell is made that regulation, can be prevented effectively from because
The inaccurate problem of measurement result that the adsorptivity of methane is brought.
(4) asepwirator pump is increased, further reduces the impact that absorption is caused, while accelerating measuring speed.
Description of the drawings
Fig. 1 is the structural representation of the pump suction type laser methane on-Line Monitor Device described in one embodiment of this utility model；
Wherein, 1- continuous currents source, 2-TEC electricity refrigerators, 3-DFB laser instrument, 4- single-mode fibers, 5- laser aligners,
6- plane of reflection mirrors, 7- gas absorption cells, 8- asepwirator pumps, 9- aspirating air pipes, 10- dust filter units, 11- photodetectors.
Specific embodiment
This utility model is described in further detail below in conjunction with the drawings and specific embodiments.According to following explanation and power
Sharp claim, advantages and features of the present utility model will become apparent from.It should be noted that, accompanying drawing using very simplify in the form of and
Non- accurately ratio is used, only to purpose that is convenient, lucidly aiding in illustrating this utility model embodiment.
Embodiment
This utility model is related to a kind of on-Line Monitor Device, more specifically, more particularly to a kind of pump suction type laser methane
On-Line Monitor Device, belongs to detection technique field.
As shown in figure 1, a kind of pump suction type laser methane on-Line Monitor Device, makes including electric with constant current source 1 and TEC respectively
The Distributed Feedback Laser 3 of the connection of cooler 2, gas absorption cell 7, the laser aligner in the gas absorption cell 75, two is mutually
Parallel plane of reflection mirror 6 and photodetector 11；The Distributed Feedback Laser 3 passes through single-mode fiber 4 and described laser aligner
5 connections, the laser that the laser aligner 5 sends can quilts after described two plane of reflection mirrors 6 being parallel to each other reflect
The photodetector 11 is received；One side wall of the gas absorption cell 7 is provided with dust filter unit 10, and another side wall leads to
Cross aspirating air pipe 9 to be connected with asepwirator pump 8.
Asepwirator pump therein 8, continuous to work, the gas in environment enters gas absorption cell 7 after passing through dust filter unit 10,
Discharged outside gas absorption cell 7 by aspirating air pipe 9 afterwards.
On the basis of above-mentioned technical proposal, this utility model can also make following improvement：
In a preferred version, described photodetector 11 is arranged on the side wall of the gas absorption cell 7.
In a preferred version, the optical maser wavelength of the described transmitting of Distributed Feedback Laser 3 be 1.51 microns (or methane exist it is bright
Other wavelength of aobvious spectral absorption), operating current 35mA-50mA, output power range 1-2mW.
In a preferred version, the focal length of the laser aligner 5 is 10cm, and the angle of divergence is not more than ± 1.2 °.
In a preferred version, the gas absorption cell 7 is made using pure stainless steel material, and inwall is polished and is coated with Te Fu
Imperial protective layer.
In a preferred version, the dust filter unit 10 is made using teflon, and the diameter of filtration granule exists
Between 10-20 microns.
In a preferred version, the photodetector 11 is made using InGaAsP materials, and response wave length scope 1.1
～1.7 microns.
In a preferred version, the plane of reflection mirror 5 is made up of quartz material, and surface is coated with high reflectance aluminium film, institute
State aluminium film surface and be coated with one layer of Teflon protective layer.
Pump suction type laser methane on-Line Monitor Device of the present utility model, can improve the service life of probe.Gas is inhaled
7 cavity of receives pond is using the very high metal material of rustless steel or other surfaces compactness extent, and does polishing.On gas road
Footpath and 7 inner-walls of duct of gas absorption cell are coated with Teflon protective layer or other can effectively reduce the protection for adsorbing the impact for causing
Layer.In addition, under high velocity air state, methane molecule substantially can weaken in the adsorptivity of body surface, by adding asepwirator pump
8 so that the methane concentration inside and outside gas absorption cell 7 is reached unanimously at faster speed, not only accelerates the survey of the detection means
Amount speed, also reduces due to adsorbing the impact for causing.
This utility model compared with prior art, with advantages below：
(1) as a result of laser spectrum absorption process, it is to avoid longevity for being had using the sensor probe of electrochemical principle
The short problem with poisoning of life so that service life can be improved to more than 5 years.
(2) due to adopting spectral absorption technology, using the specific gas of specific wavelength detecting, not by other unrelated gases
Interference, particularly do not improved accuracy by the aqueous vapor interference in air.
(3) process to the making material and interior surface of gas absorption cell 7 is made that regulation, can be prevented effectively from because
The inaccurate problem of measurement result that the adsorptivity of methane is brought.
(4) asepwirator pump 8 is increased, the impact that absorption is caused is further reduced, while accelerating measuring speed.
Adopt this utility model provide a kind of pump suction type laser methane on-Line Monitor Device specific work process for：
Galvanic current stream is produced by continuous current source 1 and is input to Distributed Feedback Laser 3, TEC electricity refrigerators 2 adjust DFB and swash
The operating temperature of light 3 is maintained at 25 DEG C, and power and ripple are sent when Distributed Feedback Laser 3 is under stable operating temperature and current condition
The stable laser of length, is exported into laser aligner 5 by single-mode fiber 4.The edge in space is straight by laser coupled for laser aligner 5
Line is propagated, and between the plane of reflection mirror 6 that two reflectings surface are parallel to each other, roundtrip is connect by photodetector 11 after several times
Receive.
Asepwirator pump 8 is continuous to work, it is ensured that the air velocity in gas absorption cell 7 is not less than 5m/s.
Gas in environment discharges gas by aspirating air pipe 9 afterwards by gas absorption cell 7 is entered after dust filter unit 10
Outside body absorption cell 7.
A kind of pump suction type laser methane on-Line Monitor Device that this utility model is provided, using laser spectrum absorption detecting
Mode is measured to the methane content in air, not by the shadow of such as gas such as oxygen, carbon dioxide of other gases in air
Ring, while will not fail because methane concentration is too high.The air-flow in gas absorption cell 7 is caused due to increased asepwirator pump 8
Speed maintains the flowing of high speed, while increased anti-absorption on the surface of 7 inwall of gas absorption cell and plane of reflection mirror 6
Process so that be greatly lowered as inaccurate degree is measured caused by the adsorption of methane.
Obviously, those skilled in the art can carry out various changes to utility model and modification is new without deviating from this practicality
The spirit and scope of type.So, if it is of the present utility model these modification and modification belong to this utility model claim and its
Within the scope of equivalent technologies, then this utility model is also intended to including including these changes and modification.
Claims (8)
1. a kind of pump suction type laser methane on-Line Monitor Device, it is characterised in that including respectively with constant current source and TEC electricity refrigeration
The Distributed Feedback Laser of device connection, gas absorption cell, laser aligner in the gas absorption cell, two be parallel to each other
Plane of reflection mirror and photodetector；The Distributed Feedback Laser is connected with described laser aligner by single-mode fiber, described to swash
The laser that optical collimator sends can be by the photodetector after described two plane of reflection mirror reflections being parallel to each other
Receive；One side wall of the gas absorption cell is provided with dust filter unit, and another side wall passes through aspirating air pipe and asepwirator pump
Connection.
2. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that described photodetection
Device is arranged on the side wall of the gas absorption cell.
3. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that described DFB laser
The optical maser wavelength of device transmitting is 1.51 microns, operating current 35mA-50mA, output power range 1-2mW.
4. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that the laser aligner
Focal length be 10cm, the angle of divergence be not more than ± 1.2 °.
5. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that the gas absorption cell
Made using pure stainless steel material, inwall is polished and is coated with Teflon protective layer.
6. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that the dust filter unit
Made using teflon, and the diameter of filtration granule is between 10-20 microns.
7. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that the photodetector
Made using InGaAsP materials, and 1.1～1.7 microns of response wave length scope.
8. pump suction type laser methane on-Line Monitor Device according to claim 1, it is characterised in that the plane of reflection mirror
It is made up of quartz material, surface is coated with aluminium film, the aluminium film surface is coated with one layer of Teflon protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621125238.8U CN206074442U (en) | 2016-10-12 | 2016-10-12 | A kind of pump suction type laser methane on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621125238.8U CN206074442U (en) | 2016-10-12 | 2016-10-12 | A kind of pump suction type laser methane on-Line Monitor Device |
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| Publication Number | Publication Date |
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| CN206074442U true CN206074442U (en) | 2017-04-05 |
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ID=58441256
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| CN201621125238.8U Active CN206074442U (en) | 2016-10-12 | 2016-10-12 | A kind of pump suction type laser methane on-Line Monitor Device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630152A (en) * | 2020-12-18 | 2021-04-09 | 中国科学院广州能源研究所 | System for on-line measuring methane content in marsh gas pipeline |
-
2016
- 2016-10-12 CN CN201621125238.8U patent/CN206074442U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630152A (en) * | 2020-12-18 | 2021-04-09 | 中国科学院广州能源研究所 | System for on-line measuring methane content in marsh gas pipeline |
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| GR01 | Patent grant | ||
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Address after: 430000 Guannan Fuxing Medical Park, 58 Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 9 buildings, 7 floors, 07-3 Patentee after: Wuhan City Qin billion information technology Limited by Share Ltd Address before: 430072 Guannan Fuxing Medical Park, 58 Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, No. 05, 24 floors Patentee before: WUHAN ZHIQIN CHUANGYI INFORMATION TECHNOLOGY CO., LTD. |
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