CN207850895U - A kind of laser methane gas sensor - Google Patents
A kind of laser methane gas sensor Download PDFInfo
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- CN207850895U CN207850895U CN201721902164.9U CN201721902164U CN207850895U CN 207850895 U CN207850895 U CN 207850895U CN 201721902164 U CN201721902164 U CN 201721902164U CN 207850895 U CN207850895 U CN 207850895U
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- laser
- photodetector
- mounting hole
- inner cavity
- rear end
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Abstract
The utility model provides a kind of laser methane gas sensor, it include shell and be set to 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 constitute M type light paths；Laser and the photodetector described in the circuit board electrical connection.The laser methane gas sensor has the advantages that simple in structure, easy to assembly, low-profile, optical path length.
Description
Technical field
The utility model is related to a kind of gas sensors, 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, simultaneously
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 of 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 detections 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 are 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 advantages such as be not easy to drift about.But current laser measuring technology is due to the shadow by optics gas chamber
It rings, volume is all bigger.
With the development of science and technology laser sensor, in order to reduce overall sensor size, needs to subtract to miniaturization
The volume of few optics gas chamber, in order to have higher measurement accuracy and detectivity, and must have sufficiently long light path, but light path
Therefore miniaturization that is too long and being unfavorable for sensor 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.
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, to provide a kind of laser methane gas sensor.
To achieve the goals above, technical solution used by the utility model is：
A kind of laser methane gas sensor, it includes shell and is set to optics gas chamber, the laser of the enclosure
Device, photodetector and circuit board；
The optics gas chamber includes an inner cavity, and described inner cavity one end offers laser mounting hole and photodetector peace
Hole is filled, the laser is arranged in the laser mounting hole, and the photodetector setting is pacified in the photodetector
It fills in hole；The inner cavity is additionally provided with multigroup reflective mirror, and the laser, the photodetector and the reflective mirror constitute M
Type light path；Laser and the photodetector described in the circuit board electrical connection.
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
The cavity wall at end and the rear end, the cavity wall are provided with slot；The laser mounting hole and the photodetector mounting hole are opened
It is located at the rear end, the optics gas chamber is connect 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
It holds in the rear, the optics gas chamber is connect 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
Circuit board setting is stated in the rear in end cap, the rear end cap be equipped with can accommodate the circuit board cable by centre bore.
Based on above-mentioned, the front sleeve is provided with the protection that one or more enter the optics gas chamber for gas and filters
Net.
Based on above-mentioned, the front sleeve corresponds to the stomata setting venthole of the closing inner chamber front end, 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 utility model has substantive features and progress compared with the prior art, specifically, the utility model have with
Lower advantage：
Multigroup reflective mirror is equipped in the inner cavity of the photoelectricity gas chamber, the laser that laser is launched is reflected by each speculum
It is received afterwards by photodetector, constitutes M type light paths, interior in a limited space can greatly prolonged light path, effectively reduce and swash
Light methane gas sensor overall dimensions.Further, the optics gas chamber is installed on by screw thread in the shell, is reduced as possible
The overall volume of laser methane gas sensor, structure and assembly technology are simple, performance stablize, and screw thread can also play it is close
Insulate quick-fried effect.Further, the venthole is corresponded in the front sleeve and is equipped with filter screen, to avoid dust or other sundries
Into sensor internal, protective action is played.Further, laser, photodetector, reflective is designed on the optics gas chamber
The mounting hole of mirror, circuit board greatly facilitates between laser, photodetector, reflective mirror, circuit board and optical cavity
It is fixed, and reflective mirror, laser, photodetector pass through that mounting hole is embedded in can be further in the cavity wall of photoelectricity gas chamber inner cavity
Save space.
Description of the drawings
Fig. 1 is the structural schematic diagram of laser methane sensor in the utility model（One）.
Fig. 2 is the structural schematic diagram of laser methane sensor in the utility model（Two）.
Fig. 3 is optics air chamber structure schematic diagram described in the utility model.
In figure：1. front sleeve；11. protecting 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.
Specific implementation mode
Below by specific implementation mode, the technical solution of the utility model is described in further detail.
As shown in Figures 1 to 3, a kind of laser methane gas sensor, it includes shell and is set to 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, before described
4 inside infusion epoxy resin sealing material of sleeve 1 and the rear end cap；The circuit board 3 is arranged in end cap 4 in the rear, institute
State rear end cap 4 be equipped with can accommodate 3 cable 31 of the circuit board by centre bore 40.As shown in Fig. 2, the rear end cap 4
Rear end is additionally provided with external screw thread 41 and is convenient for installation and fixation of the user to entire sensor.
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
The cavity wall of front end and the rear end, the front sleeve 1 correspond to the stomata setting venthole of the closing inner chamber front end, the ventilation
Protection strainer 11 is provided in 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 sundries, 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；It reduces and swashs 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 in institute
It states in laser mounting hole 24, the photodetector 6 is arranged in the photodetector mounting hole 25；The inner cavity is also set
It is equipped with reflective mirror 21, reflective mirror 22 and reflective mirror 23, is opened up in the cavity wall there are three reflective mirror mounting hole 26, three groups of reflective mirrors
It is respectively arranged in the reflective mirror mounting hole, the transmitting light beam of the laser 5 is reflexed to reflective by the reception of the reflective mirror 21
Mirror 22, reflective mirror 22 reflex to reflective mirror 23, and the reflection of reflective mirror 23 constitutes M type light paths by the reception of the photodetector 6,
Effectively extend light path in a limited space, meets 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, the volume of the optics gas chamber is reduced, reduces the overall volume of laser methane gas sensor as possible.Together
When, the reflective mirror is set to 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 paraboloid can be selected anti-according to demand
Light microscopic.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model rather than limits it
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：It can still modify to specific embodiment of the present utility model or some technical characteristics are equally replaced
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (10)
1. a kind of laser methane gas sensor, it is characterised in that：It includes shell and is set to 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 setting is installed in the photodetector
In hole；The inner cavity is additionally provided with multigroup reflective mirror, and the laser, the photodetector and the reflective mirror constitute M types
Light path；Laser and the photodetector described in the circuit board electrical connection.
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
It states 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 connect 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, and the cavity wall of the connection front end and the rear end are closed, 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 connect with the outer casing screw.
4. laser methane gas sensor according to claim 3, it is characterised in that：The shell includes front sleeve with after
End cap, the rear end cap and the front sleeve are threadedly coupled；The circuit board is arranged in end cap in the rear, on the rear end cap
Equipped with can accommodate the circuit board cable by centre bore.
5. laser methane gas sensor according to claim 4, it is characterised in that：The front sleeve be provided at one or
Many places enter the protection strainer of the optics gas chamber for gas.
6. laser methane gas sensor according to claim 4, it is characterised in that：The front sleeve corresponds to the closing
Venthole is arranged in the stomata of inner cavity front end, and protection strainer is provided in the venthole.
7. laser methane gas sensor according to claim 5 or 6, it is characterised in that：The reflective mirror is paraboloid
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 2, it is characterised in that：The semiclosed inner cavity is wire chamber
Body.
10. laser methane gas sensor according to claim 4, 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 |
|---|---|---|---|
| CN201721902164.9U CN207850895U (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 |
|---|---|---|---|
| CN201721902164.9U CN207850895U (en) | 2017-12-29 | 2017-12-29 | A kind of laser methane gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207850895U true CN207850895U (en) | 2018-09-11 |
Family
ID=63420000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721902164.9U Active CN207850895U (en) | 2017-12-29 | 2017-12-29 | A kind of laser methane gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207850895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991238A (en) * | 2017-12-29 | 2018-05-04 | 汉威科技集团股份有限公司 | A kind of laser methane gas sensor |
-
2017
- 2017-12-29 CN CN201721902164.9U patent/CN207850895U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991238A (en) * | 2017-12-29 | 2018-05-04 | 汉威科技集团股份有限公司 | A kind of laser methane gas sensor |
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