CN210166302U - Long-optical-path infrared gas sensor reflection gas chamber for detecting methane gas concentration - Google Patents
Long-optical-path infrared gas sensor reflection gas chamber for detecting methane gas concentration Download PDFInfo
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- CN210166302U CN210166302U CN201920593249.6U CN201920593249U CN210166302U CN 210166302 U CN210166302 U CN 210166302U CN 201920593249 U CN201920593249 U CN 201920593249U CN 210166302 U CN210166302 U CN 210166302U
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Abstract
The utility model provides a detect long light path infrared gas sensor reflection air chamber of methane gas concentration belongs to infrared sensor technical field. The air chamber comprises a shell and an air chamber formed by the shell, wherein the shell is provided with an air inlet and an air outlet; an infrared light source and a photoelectric detector are arranged at the bottom of the air chamber, and first isolating lenses are arranged at the upper ends of the infrared light source and the photoelectric detector; the top of the air chamber is provided with a concave reflector, and the front end of the concave reflector is provided with a second isolation lens. The utility model discloses reflection air chamber structure when using, with infrared light source, photoelectric detector, concave surface speculum, lens, the shell equipment can directly use after finishing, simple structure, and the equipment is convenient, and low cost. The utility model discloses an open reflection air chamber structure detects methane concentration, and response time is fast, interference immunity is strong, job stabilization.
Description
Technical Field
The utility model belongs to the technical field of infrared gas sensor, specifically be a detect long optical path infrared gas sensor reflection air chamber of methane gas concentration.
Background
In recent years, gas sensors have been receiving more and more attention because of the frequent accidents caused by gas explosion, which causes huge economic loss and casualties. At present, most of monitoring on methane mainly uses sensor monitoring of a catalytic combustion principle, the detection precision is low, the detection range is narrow, and monitoring on high-concentration methane can obtain wrong results due to measurement drift.
The infrared gas sensor is based on the working principle of physical reaction, mainly depends on the molecules of gas to absorb the energy of infrared spectrum, and the absorption only aims at a certain specific spectral wavelength, namely, the selective physical absorption. Compared with the sensor of the traditional working principle, the working principle has the characteristics of continuous and uninterrupted measurement, quick response, no pollution, wide measurement range, capability of detecting various gases, good sensitivity and the like, so that the sensor of the working principle becomes the first choice in various industries at present.
In order to improve the accuracy of the infrared gas sensor, the effective absorption optical path of infrared light in the gas to be measured needs to be increased. Most infrared gas sensors in the current market improve the accuracy of the sensors by increasing effective optical paths, so that the size of the sensors is increased, the response time of the sensors is increased, and the instantaneity is low. Meanwhile, the production cost and the installation difficulty are increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides an infrared gas sensor reflection air chamber structure of detection methane gas concentration based on dual wavelength single light source infrared absorption principle when reducing the sensor volume, guarantees the effectiveness of sensor.
The utility model discloses the purpose is realized through following technical scheme:
a long-optical-path infrared gas sensor reflection gas chamber for detecting the concentration of methane gas comprises a shell and a gas chamber formed by the shell, wherein the shell is provided with a gas inlet and a gas outlet; an infrared light source and a photoelectric detector are arranged at the bottom of the air chamber, and first isolating lenses are arranged at the upper ends of the infrared light source and the photoelectric detector; the top of the air chamber is provided with a concave reflector, and the front end of the concave reflector is provided with a second isolation lens.
Furthermore, the photoelectric detector comprises two independent sensing units, and the two sensing units are provided with independent optical filter channels and used for receiving light rays emitted by the infrared light source reflected by the concave reflector.
Further, the concave reflecting mirror and the second isolating lens are supported and fixed on the top of the air chamber through a first support.
Furthermore, the infrared light source and the upper end of the photoelectric detector are positioned on the same plane.
Further, the photoelectric detector is supported and fixed at the bottom of the air chamber through a second support.
Further, the infrared light source is arranged in the light gathering cup, the inner wall of the light gathering cup is polished, and the inner wall of the light gathering cup is plated with molybdenum.
Further, the concave reflecting mirror is a gold-plated piece.
Further, the air inlet and the air outlet are arranged in the middle of the shell and are symmetrical with each other by a central axis.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses reflection air chamber structure when using, with infrared light source, photoelectric detector, concave surface speculum, lens, the shell equipment can directly use after finishing, simple structure, and the equipment is convenient, and low cost.
The utility model discloses an open reflection air chamber structure detects methane concentration, and response time is fast, interference immunity is strong, job stabilization.
Drawings
FIG. 1 is a schematic structural diagram of a long optical path infrared gas sensor reflection gas chamber for detecting methane gas concentration.
Reference numerals: the device comprises a shell, a gas chamber, an air inlet, an air outlet, an infrared light source, a photoelectric detector, a first isolating lens, a concave reflector, a second isolating lens, a first support, a second support and a light gathering cup, wherein the shell is 1, the gas chamber is 2, the air inlet is 3, the air outlet is 4, the infrared light source is 5, the photoelectric detector is 6, the first isolating lens is 7, the concave reflector is 8, the second isolating lens is 9, the first support.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following description will be made in detail with reference to specific structures and principles of the long optical path infrared gas sensor reflection air chamber for detecting methane gas concentration.
A long optical path infrared gas sensor reflection gas chamber for detecting methane gas concentration is shown in figure 1. The air-conditioning device comprises a shell 1 and an air chamber 2 formed by the shell 1, wherein an air inlet 3 and an air outlet 4 are arranged on the shell 1; an infrared light source 5 and a photoelectric detector 6 are arranged at the bottom of the air chamber 2, and first isolation lenses 7 are arranged at the upper ends of the infrared light source 5 and the photoelectric detector 6; the top of the air chamber 2 is provided with a concave reflector 8, and the front end of the concave reflector 8 is provided with a second isolation lens 9.
The utility model discloses among the reflection air chamber structure, shell 1 has constituted open air chamber 2, the methane that awaits measuring passes through air inlet 3 on the shell 1 and gets into air chamber 2, the infrared light source 5 that 2 bottoms of air chamber set up provides the infrared light, concave surface speculum 8 can increase the optical path length of infrared light, reflection infrared light that reflection infrared light source 5 provided to photoelectric detector 6, photoelectric detector 6 is used for realizing the measurement of the methane concentration that awaits measuring, its concrete structure is unrestricted, as long as can realize the measurement to the methane concentration that awaits measuring can. The first and second isolation lenses 7 and 9 are used to isolate the infrared light source 5, photodetector 6, and concave mirror 8, respectively, from the gas in the gas cell 2.
Further, the photodetector 6 includes two independent sensing units, and the two sensing units have independent optical filter channels for receiving the light emitted from the infrared light source 5 reflected by the concave reflector 8. The output signals of the two channels are converted into voltage signals which are respectively called measuring channel voltage and reference channel voltage, and the concentration of the methane to be measured can be obtained by comparing the two voltage signals.
Further, the concave reflector 8 and the second isolation lens 9 are supported and fixed on the top of the gas chamber 2 through a first support 10.
Further, the upper ends of the infrared light source 5 and the photoelectric detector 6 are positioned on the same plane.
Further, the photoelectric detector 6 is supported and fixed at the bottom of the gas chamber 2 through a second bracket 11.
Further, the infrared light source 5 is arranged in the light-gathering cup 12, the inner wall of the light-gathering cup 12 is polished, and the inner wall of the light-gathering cup 12 is plated with molybdenum.
Further, the concave reflector 8 is a gold-plated member. The concave reflecting mirror 8 is a gold-plated piece, so that the light reflectivity is improved, and the light loss interference is reduced.
Further, the air inlet 3 and the air outlet 4 are disposed in the middle of the housing 1 and are symmetrical to each other about a central axis.
The utility model relates to a detect the infrared gas sensor reflection air chamber's of long light journey of methane gas concentration concrete working process does:
before operation, the infrared light source 5, the photodetector 6, the concave reflector 8, the first isolation lens 7, the second isolation lens 9 and the housing 1 are assembled into a reflection gas chamber structure as shown in fig. 1 (of course, the already assembled structure may be adopted). During specific detection, gas to be detected with methane enters the gas chamber 2 from the gas inlet 3 on the shell 1, the infrared light source 5 emits infrared light parallel to the central axis, the infrared light is reflected by the concave reflector 8 and then absorbed by the photoelectric detector 6, and the concentration of the gas to be detected is detected by the photoelectric detector 6.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A long-optical-path infrared gas sensor reflection gas chamber for detecting the concentration of methane gas is characterized by comprising a shell and a gas chamber formed by the shell, wherein the shell is provided with a gas inlet and a gas outlet; an infrared light source and a photoelectric detector are arranged at the bottom of the air chamber, and first isolating lenses are arranged at the upper ends of the infrared light source and the photoelectric detector; the top of the air chamber is provided with a concave reflector, and the front end of the concave reflector is provided with a second isolation lens.
2. The long optical path infrared gas sensor reflection gas cell for detecting methane gas concentration of claim 1, wherein said photodetector comprises two independent sensing units having independent filter channels for receiving light from the infrared light source reflected by the concave mirror.
3. The infrared gas sensor reflection gas cell for detecting the concentration of methane gas as claimed in claim 1, wherein said concave reflector and said second isolation lens are supported and fixed on the top of the gas cell by a first support.
4. The long optical path infrared gas sensor reflection gas cell for detecting methane gas concentration of claim 1, wherein said infrared light source and the upper end of the photodetector are located on the same plane.
5. The long optical path infrared gas sensor reflection gas cell for detecting methane gas concentration of claim 1, wherein said photodetector is supported and fixed to the bottom of the gas cell by a second support.
6. The long-optical-path infrared gas sensor reflection gas chamber for detecting the concentration of methane gas as claimed in claim 1, wherein the infrared light source is arranged in the light focusing cup, the inner wall of the light focusing cup is polished, and the inner wall of the light focusing cup is plated with molybdenum.
7. The long optical path infrared gas sensor reflection gas cell for detecting methane gas concentration of claim 1, wherein said concave reflector is gold plated.
8. The long optical path infrared gas sensor reflection gas cell for detecting methane gas concentration according to claim 1, wherein the gas inlet and the gas outlet are disposed at a middle portion of the housing and are symmetrical to each other about a central axis.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920593249.6U CN210166302U (en) | 2019-04-26 | 2019-04-26 | Long-optical-path infrared gas sensor reflection gas chamber for detecting methane gas concentration |
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| CN201920593249.6U CN210166302U (en) | 2019-04-26 | 2019-04-26 | Long-optical-path infrared gas sensor reflection gas chamber for detecting methane gas concentration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540054A (en) * | 2020-11-26 | 2021-03-23 | 威海精讯畅通电子科技有限公司 | Detection device based on NDIR technology |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540054A (en) * | 2020-11-26 | 2021-03-23 | 威海精讯畅通电子科技有限公司 | Detection device based on NDIR technology |
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