CN107991238A - A kind of laser methane gas sensor - Google Patents
A kind of laser methane gas sensor Download PDFInfo
- Publication number
- CN107991238A CN107991238A CN201711484462.5A CN201711484462A CN107991238A CN 107991238 A CN107991238 A CN 107991238A CN 201711484462 A CN201711484462 A CN 201711484462A CN 107991238 A CN107991238 A CN 107991238A
- Authority
- CN
- China
- Prior art keywords
- laser
- photodetector
- rear end
- mounting hole
- inner cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000009434 installation Methods 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 37
- 238000005516 engineering process Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The present invention provides a kind of laser methane gas sensor, it include shell and be arranged at book state optics gas chamber, photodetector, laser and the circuit board of enclosure, the optics gas chamber includes an inner cavity, described inner cavity one end offers laser mounting hole and photodetector mounting hole, the laser is arranged in the laser mounting hole, and the photodetector is arranged in the photodetector mounting hole；The inner cavity is additionally provided with multigroup reflective mirror, and the laser, the photodetector and the reflective mirror form M type light paths；Laser described in the circuit board electrical connection and the photodetector.The laser methane gas sensor has the advantages that simple in structure, easy to assembly, low-profile, optical path length.
Description
Technical field
The present invention relates to a kind of gas sensor, and in particular to a kind of laser methane gas sensor.
Background technology
Methane has a wide range of applications as important fuel and the raw material of industry in daily life and industrial production, at the same time
It is inflammable and explosive gas again, so having in oil-gas mining, natural gas transportation, biogas production, derived energy chemical, coal, metallurgy etc.
It is likely to occur air accumulation or gas leakage and the special link to people life property safety's generation significant threat is needed to first
The leakage of alkane is detected.Currently used CH_4 detection technology mainly has the detection sides such as semiconductor, catalysis, infrared and laser method
Method.Wherein laser methane detection technique is a kind of detection technique relatively professional in CH_4 detection technology.Laser methane sensor
There is the advantages such as long-life, anti-interference, anti-poisoning compared to semiconductor and catalytic sensor, there is anti-hydrocarbon again compared to infrared sensor
Class cross jamming, water resistant gas, stablize the advantage such as be not easy to drift about.But current shadow of the laser measuring technology due to being subject to optics gas chamber
Ring, volume is all bigger.
With the development of science and technology laser sensor is to miniaturization, in order to reduce overall sensor size, it is necessary to subtract
The volume of few optics gas chamber, in order to have the measurement accuracy of higher and detectivity, and must have sufficiently long light path, but light path
Miniaturization that is too long and being unfavorable for sensor, therefore, designs that a kind of optics chamber volume is smaller and the sufficiently long laser first of pipeline
Alkane gas sensor has important practical significance.
The content of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, so as to provide a kind of laser methane gas sensor.
To achieve these goals, the technical solution adopted in the present invention is：
A kind of laser methane gas sensor, it includes shell and is arranged at optics gas chamber, laser, the light of the enclosure
Electric explorer and circuit board；
The optics gas chamber includes an inner cavity, and described inner cavity one end offers laser mounting hole and photodetector installation
Hole, the laser are arranged in the laser mounting hole, and the photodetector is arranged on the photodetector installation
In hole；The inner cavity is additionally provided with multigroup reflective mirror, and the laser, the photodetector and the reflective mirror form M types
Light path；Laser described in the circuit board electrical connection and the photodetector.
Based on above-mentioned, before the inner cavity of the optics gas chamber is semiclosed inner cavity, including front-end and back-end, and connection is described
End and the cavity wall of the rear end, the cavity wall are provided with slot；The laser mounting hole and the photodetector mounting hole are opened
The rear end is located at, the optics gas chamber is connected by the external screw thread on the rear end with the outer casing screw.
Based on above-mentioned, the inner cavity of the optics gas chamber is closing inner chamber, including front-end and back-end, and the connection front end
With the cavity wall of the rear end, the front end is provided with stomata, and the laser mounting hole and the photodetector mounting hole open up
Hold in the rear, the optics gas chamber is connected by the external screw thread on the rear end with the outer casing screw.
Based on above-mentioned, the shell includes front sleeve and rear end cap, and the rear end cap and the front sleeve are threadedly coupled；Institute
State circuit board to be arranged in the rear end cap, the rear end cap, which is equipped with, can accommodate the centre bore that the circuit board cable passes through.
Based on above-mentioned, the front sleeve is provided with one or more and is used to gas and enters protection of the optics gas chamber filtering
Net.
Based on above-mentioned, the stomata that the front sleeve corresponds to the closing inner chamber front end sets venthole, in the venthole
It is provided with protection strainer.
Based on above-mentioned, the reflective mirror is parabolic reflector or plane mirror.
Based on above-mentioned, the rear end of the inner cavity is equipped with circuit board mounting hole, and the circuit board is secured by bolts in described
On circuit board mounting hole.
Based on above-mentioned, the semiclosed inner cavity is metal cavity.
Based on above-mentioned, infusion epoxy resin sealing material inside the front sleeve and the rear end cap.
The present invention has prominent substantive distinguishing features and marked improvement compared with the prior art, and specifically, the present invention has
Advantages below：
Be equipped with multigroup reflective mirror in the inner cavity of the photoelectricity gas chamber, the laser that laser is launched after the reflection of each speculum by
Photodetector receives, and forms M type light paths, interior in a limited space can greatly prolong light path, effectively reduces laser first
Alkane gas sensor overall dimensions.Further, the optics gas chamber is installed in the shell by screw thread, reduces laser as far as possible
The overall volume of methane gas sensor, structure and assembly technology are simple, performance stablize, and screw thread can also play sealing every
Quick-fried effect.Further, the venthole is corresponded in the front sleeve and is equipped with filter screen, is entered to avoid dust or other debris
Sensor internal, plays protective action.Further, be designed with the optics gas chamber laser, photodetector, reflective mirror,
The mounting hole of circuit board, greatly facilitates consolidating between laser, photodetector, reflective mirror, circuit board and optical cavity
It is fixed, and reflective mirror, laser, photodetector are embedded in the cavity wall of photoelectricity gas chamber inner cavity by mounting hole and can further saved
Save space.
Brief description of the drawings
Fig. 1 is the structure diagram of laser methane sensor in the present invention（One）.
Fig. 2 is the structure diagram of laser methane sensor in the present invention（Two）.
Fig. 3 is heretofore described optics air chamber structure schematic diagram.
In figure：1. front sleeve；11. protect strainer；2. optics gas chamber；20. front end；21. reflective mirror；22. reflective mirror；23.
Reflective mirror；24. laser mounting hole；25. photodetector mounting hole；26. reflective mirror mounting hole；27. external screw thread；3. circuit
Plate；31. cable；4. rear end cap；40. centre bore；41. external screw thread；5. laser；6. photodetector.
Embodiment
Below by embodiment, technical scheme is described in further detail.
As shown in Figures 1 to 3, a kind of laser methane gas sensor, it includes shell and is arranged at the enclosure
Optics gas chamber 2, laser 5, photodetector 6 and circuit board 3；
The shell includes front sleeve 1 and rear end cap 4, and the rear end cap 4 and the front sleeve 1 are threadedly coupled, the front sleeve 1
With the 4 inside infusion epoxy resin sealing material of rear end cap；The circuit board 3 is arranged in the rear end cap 4, the rear end
Lid 4, which is equipped with, can accommodate the centre bore 40 that 3 cable 31 of circuit board passes through.As shown in Fig. 2, the rear end of the rear end cap 4 is also
It is easy to installation and fixation of the user to whole sensor equipped with external screw thread 41.
As shown in Figure 1, the inner cavity of the optics gas chamber 2 is closing inner chamber, it includes front-end and back-end, and described in connection
Front end and the cavity wall of the rear end, the stomata that the front sleeve 1 corresponds to the closing inner chamber front end set venthole, the ventilation
Protection strainer 11 is provided with hole；Further, as shown in Figure 3 in other examples, the optics gas chamber 2 can also be half
Closing inner chamber, the inner cavity are metal cavity, it includes front end 20 and rear end, and connect the front end 20 and the rear end
Cavity wall, the cavity wall are provided with slot, and the front sleeve 1 corresponds to the slot, are provided with many places and enter the optics for gas
The protection strainer of gas chamber 2.Each protection strainer can enter sensor internal to avoid dust or other debris, play protection and make
With.
The optics gas chamber 2 is threadedly coupled by the external screw thread 27 on the rear end with the front sleeve 1；Reduce and swash as far as possible
The overall volume of light methane gas sensor, structure and assembly technology are simple, and performance is stablized, and screw thread can also play sealing
The effect of flame proof.
The rear end offers laser mounting hole 24 and photodetector mounting hole 25, and the laser 5 is arranged on institute
State in laser mounting hole 24, the photodetector 6 is arranged in the photodetector mounting hole 25；The inner cavity is also set
Reflective mirror 21, reflective mirror 22 and reflective mirror 23 are equipped with, three reflective mirror mounting holes 26, three groups of reflective mirrors are offered in the cavity wall
It is respectively arranged in the reflective mirror mounting hole, the transmitting light beam of laser 5 is reflexed to reflective by the reflective mirror 21 reception
Mirror 22, reflective mirror 22 reflex to reflective mirror 23, and reflective mirror 23, which reflects to be received by the photodetector 6, forms M type light paths,
It is interior in a limited space effectively to extend light path, meet sensor measurement sensitivity and accuracy requirement；The circuit board 3 is electrically connected
The laser 5 and the photodetector 6.In other examples, the number of the reflective mirror can be arranged as required to.
Each reflective mirror, the laser and the photodetector are embedded in the chamber by respective mounting hole respectively
In wall, space is saved, reduces the volume of the optics gas chamber, reduces the overall volume of laser methane gas sensor as far as possible.Together
When, the reflective mirror is arranged at the angle that can adjust reflective mirror in the reflective mirror mounting hole as needed.
Further, the rear end of the inner cavity is equipped with circuit board mounting hole, and the circuit board is secured by bolts in the electricity
On the plate mounting hole of road, the reflective mirror is plane mirror.In other examples, also parabola can be selected anti-according to demand
Light microscopic.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
It can modify to the embodiment of the present invention or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical solution, it should all cover among the claimed technical solution scope of the present invention.
Claims (10)
- A kind of 1. laser methane gas sensor, it is characterised in that：It includes shell and is arranged at the optics of the enclosure Gas chamber, laser, photodetector and circuit board；The optics gas chamber includes an inner cavity, and described inner cavity one end offers laser mounting hole and photodetector installation Hole, the laser are arranged in the laser mounting hole, and the photodetector is arranged on the photodetector installation In hole；The inner cavity is additionally provided with multigroup reflective mirror, and the laser, the photodetector and the reflective mirror form M types Light path；Laser described in the circuit board electrical connection and the photodetector.
- 2. laser methane gas sensor according to claim 1, it is characterised in that：The inner cavity of the optics gas chamber is half Closing inner chamber, including front-end and back-end, and the cavity wall of the front end and the rear end is connected, the cavity wall is provided with slot；Institute State laser mounting hole and the photodetector mounting hole is opened in the rear end, the optics gas chamber passes through on the rear end External screw thread be connected with the outer casing screw.
- 3. laser methane gas sensor according to claim 1, it is characterised in that：The inner cavity of the optics gas chamber is envelope Inner cavity, including front-end and back-end are closed, and connect the cavity wall of the front end and the rear end, the front end is provided with stomata, described Laser mounting hole and the photodetector mounting hole are opened in the rear end, and the optics gas chamber passes through on the rear end External screw thread is connected with the outer casing screw.
- 4. the laser methane gas sensor according to Claims 2 or 3, it is characterised in that：The shell includes front sleeve And rear end cap, the rear end cap and the front sleeve are threadedly coupled；The circuit board is arranged in the rear end cap, the rear end Cover to be equipped with and can accommodate the centre bore that the circuit board cable passes through.
- 5. laser methane gas sensor according to claim 2, it is characterised in that：The front sleeve be provided with one or Many places are used for the protection strainer that gas enters the optics gas chamber.
- 6. laser methane gas sensor according to claim 3, it is characterised in that：The front sleeve corresponds to the closing The stomata of inner cavity front end sets venthole, and protection strainer is provided with the venthole.
- 7. the laser methane gas sensor according to claim 5 or 6, it is characterised in that：The reflective mirror is parabola Reflective mirror or plane mirror.
- 8. laser methane gas sensor according to claim 7, it is characterised in that：The rear end of the inner cavity is equipped with circuit Plate mounting hole, the circuit board are secured by bolts on the circuit board mounting hole.
- 9. laser methane gas sensor according to claim 8, it is characterised in that：The semiclosed inner cavity is wire chamber Body.
- 10. laser methane gas sensor according to claim 9, it is characterised in that：The front sleeve and the rear end The internal infusion epoxy resin sealing material of lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484462.5A CN107991238A (en) | 2017-12-29 | 2017-12-29 | A kind of laser methane gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484462.5A CN107991238A (en) | 2017-12-29 | 2017-12-29 | A kind of laser methane gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107991238A true CN107991238A (en) | 2018-05-04 |
Family
ID=62040516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711484462.5A Pending CN107991238A (en) | 2017-12-29 | 2017-12-29 | A kind of laser methane gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107991238A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768469A (en) * | 2019-01-22 | 2019-05-17 | 大连艾科科技开发有限公司 | Packaging method, laser and gas-detecting device |
| CN110243809A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Use the method for truncated cone-shaped Multifunctional, air body sensor detection gas ingredient |
| CN110243807A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Multifunctional, air body sensor |
| CN110243808A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Truncated cone-shaped Multifunctional, air body sensor |
| CN110568126A (en) * | 2019-09-11 | 2019-12-13 | 任启兰 | Methane sensor |
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| CN207850895U (en) * | 2017-12-29 | 2018-09-11 | 汉威科技集团股份有限公司 | A kind of laser methane gas sensor |
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| CN1808100A (en) * | 2005-12-28 | 2006-07-26 | 华东师范大学 | Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768469A (en) * | 2019-01-22 | 2019-05-17 | 大连艾科科技开发有限公司 | Packaging method, laser and gas-detecting device |
| CN110243809A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Use the method for truncated cone-shaped Multifunctional, air body sensor detection gas ingredient |
| CN110243807A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Multifunctional, air body sensor |
| CN110243808A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Truncated cone-shaped Multifunctional, air body sensor |
| CN110243808B (en) * | 2019-07-10 | 2021-11-30 | 浙江农林大学 | Round platform shape multifunctional gas sensor |
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| CN110568126A (en) * | 2019-09-11 | 2019-12-13 | 任启兰 | Methane sensor |
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