CN219532900U - Non-spectroscopic infrared gas sensor - Google Patents
Non-spectroscopic infrared gas sensor Download PDFInfo
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- CN219532900U CN219532900U CN202320612511.3U CN202320612511U CN219532900U CN 219532900 U CN219532900 U CN 219532900U CN 202320612511 U CN202320612511 U CN 202320612511U CN 219532900 U CN219532900 U CN 219532900U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The utility model relates to the technical field of gas detection and discloses a non-spectroscopic infrared gas sensor which comprises an optical gas chamber, an infrared light source and a detector, wherein the optical gas chamber is provided with a light source inlet, a light source outlet, a first reflecting surface, a second reflecting surface and a third reflecting surface, the infrared light source is positioned at the light source inlet, the detector is positioned at the light source outlet, the first reflecting surface is U-shaped and is positioned at the outer side of the infrared light source, the second reflecting surface is arc-shaped, the third reflecting surface is slope-shaped and is positioned at the light source outlet, the first reflecting surface and the second reflecting surface are positioned at the same side of the optical gas chamber, and the second reflecting surface is positioned at one side opposite to the first reflecting surface and the third reflecting surface. The utility model utilizes the mutual coordination of the infrared light source, the detector and the inner wall of the optical air chamber to prolong the light path, thereby improving the precision, having compact overall size and low cost and being suitable for mass production and use.
Description
Technical Field
The utility model relates to the technical field of gas detection, in particular to a non-spectroscopic infrared gas sensor.
Background
With the continuous progress of modern industry, people's safety consciousness is gradually enhanced, and the research on the detection and alarm directions of explosive gas, combustible gas, poisonous and harmful gas and the like also draws great social attention. The existing gas sensors can be roughly classified into catalytic combustion type, infrared type, semiconductor type, electrochemical type and the like according to the principle thereof. The infrared sensor is designed based on the principle that gas molecules are absorbed in a specific infrared spectrum band, and is widely applied to the fields of mine safety, petroleum exploration, pollution source monitoring, atmospheric physics and the like. Compared with other sensors, the infrared gas sensor overcomes the defects of easy poisoning and aging and short service life of the traditional catalytic and electrochemical sensor, and meanwhile, the infrared sensor has the characteristics of better gas selectivity, high stability and the like.
The infrared sensor generally emits an infrared beam from an infrared light source, and the beam is reflected by the inner wall of the optical chamber and finally received by the detector. The length of the optical path is a key parameter affecting the gas detection quality, and the longer the general optical path, the larger the radiation absorption amount of the detector, the stronger the generated electric signal and the higher the precision, so that in order to obtain a longer optical path and improve the precision, the existing infrared sensor often has a larger volume, and therefore, an infrared gas sensor with small volume and high precision is needed.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the utility model provides a non-spectroscopic infrared gas sensor.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the non-spectroscopic infrared gas sensor comprises an optical gas chamber, an infrared light source and a detector, wherein the infrared light source and the detector are arranged in the optical gas chamber, the optical gas chamber is provided with a light source inlet, a light source outlet, a first reflecting surface, a second reflecting surface and a third reflecting surface, the infrared light source is positioned at the light source inlet, the detector is positioned at the light source outlet, the first reflecting surface is U-shaped and is positioned at the outer side of the infrared light source, the second reflecting surface is arc-shaped, the third reflecting surface is slope-shaped and is positioned at the light source outlet, the first reflecting surface and the second reflecting surface are positioned at the same side of the optical gas chamber, and the second reflecting surface is positioned at one side opposite to the first reflecting surface and the third reflecting surface.
Working principle: after the infrared light source emits light beams, a part of light beams are directly reflected by the second reflecting surface and then are reflected by the third reflecting surface to the detector for receiving; the other part of light beam is reflected by the first reflecting surface at the entrance of the light source, then reflected by the second reflecting surface, and then reflected by the second reflecting surface to the detector for receiving.
Preferably, the optical air chamber is a cuboid, and comprises two narrow side walls, two wide side walls and two bottom surfaces, wherein the first reflecting surface and the third reflecting surface are positioned on the same narrow side wall, and the second reflecting surface is positioned on the other narrow side wall. This arrangement allows the light beam reflected by the first reflective surface to the second reflective surface and the light beam reflected by the second reflective surface to the third reflective surface to be reflected along the broad side wall of the optical cell, thereby obtaining a longer optical path.
Preferably, the angle between the normal of the third reflecting surface and the bottom surface is 45 degrees.
Preferably, the ratio of the distance between the center of the infrared light source and the two wide side walls is 0.17-0.19, and the ratio of the distance between the center of the infrared light source and the two narrow side walls is 9; the second reflection surface comprises a plane part positioned in the middle and light-gathering arc parts respectively positioned at two sides of the plane part; the third reflecting surface is a part of inner conical surface, the ratio of the axis of the third reflecting surface to the distance between the two wide side walls is 2.3-2.4, and the ratio of the axis of the third reflecting surface to the distance between the two narrow side walls is 1.1-1.3.
Preferably, the optical air chamber comprises an air chamber shell and an air chamber upper cover, wherein the air chamber shell is provided with a riveting lug, and the air chamber upper cover is provided with a riveting notch matched with the riveting lug.
The mortise and tenon type structural design is adopted, the air chamber shell and the air chamber upper cover are assembled together, so that the sealing performance of the optical air chamber can be ensured, the installation is convenient, and the separation is difficult.
Preferably, the air chamber shell and the air chamber upper cover are made of metal materials. Because the filament of the infrared light source, the lens of the detector, the sensitive element and the like are easy to deform along with the temperature change, the metal material is selected, the infrared light source has good heat conductivity, and compared with the shell made of plastic material, the temperature performance can be improved greatly.
Preferably, the air chamber shell is provided with air holes. This arrangement facilitates the gas to enter the optical gas chamber, facilitating the gas exchange.
Preferably, the outside of the optical air chamber is sequentially provided with a waterproof breathable film, dustproof filter cotton and protective cloth. This arrangement ensures the sealing integrity of the optical chamber, prevents fogging and condensation, and can extend product life.
Preferably, the infrared light source and the detector are integrated on the circuit board and located on the same side of the optical plenum. The circuit board is arranged on the outer side of the upper cover of the air chamber, connecting holes are correspondingly formed in the circuit board and the air chamber shell, the circuit board and the air chamber shell are connected through screws in the connecting holes, after the circuit board is connected, the upper cover of the air chamber is positioned between the circuit board and the air chamber shell and is fixed, and a plastic pad is arranged between the upper cover of the air chamber and the circuit board.
The utility model also comprises other components which can enable the nondispersive infrared gas sensor to be used normally, and the nondispersive infrared gas sensor is a conventional technical means in the field. In addition, the devices or components not defined in the present utility model are all conventional in the art.
The utility model provides a double-channel non-spectroscopic infrared gas sensor with a single light source and a single detector, which has the characteristics of small volume, high precision, no oxygen dependence and the like.
The infrared light source, the detector and the inner wall of the optical air chamber are matched with each other, so that the optical path is prolonged, the detected gas can fully absorb infrared light, the accuracy is improved, the whole size is compact, the cost is low, and the infrared light sensor is suitable for mass production and use.
Drawings
Fig. 1 is a schematic structural view of the present embodiment.
Fig. 2 is an exploded schematic view of the present embodiment.
Fig. 3 is a bottom view of the plenum housing of fig. 2.
Fig. 4 is a schematic view of the structure of the air chamber housing in fig. 2.
FIG. 5 is a schematic view of the plenum housing of FIG. 2 from another perspective.
Fig. 6 is a schematic view of the structure of the upper cover of the air chamber in fig. 2.
Fig. 7 is a schematic diagram of the working principle of the present embodiment.
In the figure: 1. a protective cloth; 2. dustproof filter cotton; 3. a waterproof breathable film; 4. an air chamber housing; 5. an upper cover of the air chamber; 6. a circuit board; 7. an infrared light source; 8. a detector; 9. a first reflecting surface; 10. a second reflecting surface; 11. a reflection surface III; 12. riveting the protruding blocks; 13. air holes; 14. a connection hole; 15. a plastic pad.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Examples
Referring to fig. 1-7, the non-spectroscopic infrared gas sensor comprises an optical gas chamber, an infrared light source 7 and a detector 8 which are arranged in the optical gas chamber, wherein the optical gas chamber is provided with a light source inlet, a light source outlet, a first reflecting surface 9, a second reflecting surface 10 and a third reflecting surface 11, the infrared light source 7 is positioned at the light source inlet, the detector 8 is positioned at the light source outlet, the first reflecting surface 9 is U-shaped and is positioned at the outer side of the infrared light source 7, the second reflecting surface 10 is arc-shaped, the third reflecting surface is slope-shaped and is positioned at the light source outlet, the first reflecting surface 9 and the second reflecting surface 10 are positioned at the same side of the optical gas chamber, and the second reflecting surface 10 is positioned at the side opposite to the first reflecting surface 9 and the third reflecting surface.
The inner wall of the optical chamber needs to reflect the light beam emitted by the infrared light source 7, so that the surface layer of the inner wall of the optical chamber is aluminized, so that a reflecting surface can be formed.
The light beam emitted by the second reflecting surface is incident to the third reflecting surface at a position close to the entrance of the light source and is reflected to the detector 8 through the third reflecting surface for receiving.
The infrared light source 7 is a light source with a wavelength of 1-5 μm.
The detector 8 is a dual-channel pyroelectric/thermopile detector, which comprises two independent sensitive units, wherein the two sensitive units are provided with independent filter channels (a first filter and a second filter respectively), and two independent temperature compensation elements are integrated in the detector, so that the detector can normally work in a wider temperature range. The first optical filter is a reference channel, the central wavelength of the first optical filter is 3.95um, and most of gas has no absorption peak at the wavelength; the second filter is a working channel, and the output signal is a measuring signal. The detector 8 using such a dual channel can detect information of the light beam emitted by the infrared light source 7 in real time.
Working principle: after the infrared light source 7 emits light beams, part of the light beams are directly reflected by the second reflecting surface and then are reflected by the second reflecting surface to the detector 8 for receiving; the other part of the light beam is reflected by the first reflecting surface at the entrance of the light source, then reflected by the second reflecting surface, and then reflected by the second reflecting surface to the detector 8 for receiving.
The optical air chamber is a cuboid and comprises two narrow side walls, two wide side walls and two bottom surfaces, wherein the first reflecting surface and the third reflecting surface are positioned on the same narrow side wall, and the second reflecting surface is positioned on the other narrow side wall.
The angle between the normal line of the third reflecting surface and the bottom surface is 45 degrees.
This arrangement allows the light beam reflected by the first reflective surface to the second reflective surface and the light beam reflected by the second reflective surface to the third reflective surface to be reflected along the broad side wall of the optical cell, thereby obtaining a longer optical path.
The ratio of the distance between the center of the infrared light source and the two wide side walls is 0.17-0.19, and the ratio of the distance between the center of the infrared light source and the two narrow side walls is 9; the second reflection surface comprises a plane part positioned in the middle and light-gathering arc parts respectively positioned at two sides of the plane part; the third reflecting surface is a part of inner conical surface, the ratio of the axis of the third reflecting surface to the distance between the two wide side walls is 2.3-2.4, and the ratio of the axis of the third reflecting surface to the distance between the two narrow side walls is 1.1-1.3.
Referring to fig. 3, in this embodiment, the ratio of the distance between the center of the infrared light source and the two wide side walls is L1: l2=2.8: 15.5.apprxeq.0.18; the ratio of the distance between the center of the infrared light source and the two narrow side walls is L3: l4=27: 3=9; the ratio of the axis of the reflecting surface three to the distance of the two wide side walls is L5: l6=12.65:5.65≡ 2.239; the ratio of the axis of the reflecting surface three to the distance of the two narrow side walls is L7: l8=16.5:13.5≡1.222.
The specific infrared light source and detector positions of the embodiment can obtain a longer light path under a smaller volume.
The two light-gathering arc-shaped parts on the second reflecting surface can play a role in gathering light, so that most light beams on the second reflecting surface are reflected to the third reflecting surface; the reflection surface III gradually contracts from the end part close to the detector, so that the light condensation function can be further achieved, more light beams are absorbed by the detector, the light beam loss can be greatly reduced by matching the reflection surface III and the detector, and the radiation quantity absorbed by the detector is improved.
Compared with the infrared gas sensor with the same volume in the prior art, the embodiment has the advantages of longer light path and higher radiation absorption quantity of the detector, so that the accuracy is high.
The optical air chamber comprises an air chamber shell 4 and an air chamber upper cover 5, wherein a riveting lug 12 is arranged on the air chamber shell 4, and a riveting notch matched with the riveting lug 12 is arranged on the air chamber upper cover 5.
The first reflecting surface 9, the second reflecting surface 10 and the third reflecting surface are all positioned on the air chamber shell 4, and the light source inlet and the light source outlet are both positioned on the air chamber upper cover 5.
The mortise and tenon type structural design is adopted, the air chamber shell 4 and the air chamber upper cover 5 are assembled together, so that the sealing performance of the optical air chamber can be ensured, the installation is convenient, and the separation is difficult.
The air chamber shell 4 and the air chamber upper cover 5 are made of metal materials. Since the filament of the infrared light source 7, the lens of the detector 8, the sensor, etc. are easily deformed with the temperature change, the metal material is selected to have good thermal conductivity, and the temperature performance can be improved more than that of the plastic material.
The inclination of the reflecting surface III is 45 degrees.
The air chamber shell 4 is provided with an air hole 13. This arrangement facilitates the gas to enter the optical gas chamber, facilitating the gas exchange.
The outside of the optical air chamber is sequentially provided with a waterproof breathable film 3, dustproof filter cotton 2 and protective cloth 1. This arrangement ensures the sealing integrity of the optical air chamber, prevents fogging and condensation, and can extend the product life, the protective cloth 1 being a black protective cloth 1.
The infrared light source 7 and the detector 8 are integrated on the circuit board 6 and located on the same side of the optical gas cell.
The circuit board 6 is arranged on the outer side of the air chamber upper cover 5, the circuit board 6 and the air chamber shell 4 are correspondingly provided with connecting holes 14, the circuit board 6 and the air chamber shell 4 are connected through screws in the connecting holes, after the circuit board 6 is connected, the air chamber upper cover is positioned between the circuit board 6 and the air chamber shell 4 and is fixed, and a plastic pad 15 is arranged between the air chamber upper cover and the circuit board.
The circuit board 6 is also provided with a microprocessor, a signal processing circuit and a light source driving circuit; the microprocessor IO port PB1 is connected with an LED driving module, and the LED driving module is connected with an infrared light source 7 and can control the infrared light source 7; the signal processing circuit mainly comprises an operational amplifier and a plurality of resistance capacitors; the operational amplifier adopts a double-channel operational amplifier, has the characteristics of low input offset voltage, low temperature drift and high reliability, is lower in cost compared with similar products, and is an excellent choice for analog small signal conditioning in measuring equipment such as a gas detector.
An infrared light beam is emitted by an infrared light source, then reflected by the inner wall of the optical chamber and finally received by a detector. The length of the optical path is a key parameter affecting the gas detection quality, and the longer the general optical path is, the larger the radiation absorption amount of the detector is, the stronger the generated electric signal is, therefore, compared with the infrared light source and the detector which are arranged on two opposite sides of the optical air chamber, the light beam in the embodiment can be reflected for many times through the inner wall of the optical air chamber, so that the optical path is prolonged, and the detected gas is ensured to fully absorb the infrared light.
Due to the difference of the internal structures of various molecules, the selective absorption of the molecules with different wavelengths is determined, namely, the substances can only absorb light with certain wavelengths, and the absorption relationship obeys the Lambert-Beer (Lambert-Beer) absorption law. The non-spectroscopic infrared gas sensor of this embodiment selects the absorption characteristics based on the near infrared spectrum of different gas molecules, and uses the relationship between gas concentration and absorption intensity [ Lambert-Beer law ] to identify the gas components and determine their concentrations, namely:
I＝I 0 *10 -kpL
the absorption intensity i can be expressed as:
i＝I 0 -I＝I 0 (1-10 -kpL )
wherein I is 0 Is the intensity of the incident light; i is the transmitted light intensity, L is the gas mediumThe mass thickness, p, is the gas concentration and k is the absorption coefficient of the medium for infrared light.
From the above, the gas concentration p of the detection gas can be estimated:
k*p*L＝-lg(I/I 0 )
from this, the absorption coefficient and the optical path length of the detection gas to the infrared light are known, and the gas concentration of the detection gas can be obtained. The length of the light path is a key parameter affecting the gas detection quality, and the longer the light path is, the more the detected gas can fully absorb infrared light, the larger the radiation absorption amount of the detector is, the stronger the generated electric signal is, and the measurement result is more accurate.
In this embodiment, the gas enters the optical gas chamber from the gas holes on the surface of the gas chamber housing; the infrared light source is controlled by the LED driving module to emit infrared light beams; then the infrared light beam is reflected by the inner wall of the optical air chamber for at least 2 times or 3 times, and finally is received by the detector; the voltage signal output by the detector is transmitted to the microprocessor through the signal processing circuit; the microprocessor performs AD conversion treatment on the voltage signal, and obtains a final concentration value after temperature compensation; and then judging the concentration value, and carrying out audible and visual alarm by the sensor when the concentration is too high.
The utility model utilizes the mutual coordination of the infrared light source, the detector and the inner wall of the optical air chamber, on one hand, the optical path is prolonged, the detected gas can fully absorb the infrared light, on the other hand, the beam loss is reduced, and the radiation quantity absorbed by the detector is improved, thereby improving the precision, and the utility model has compact whole size and low cost, and is suitable for mass production and use.
The embodiments of the present utility model have been described above, the description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (9)
1. The non-spectroscopic infrared gas sensor comprises an optical gas chamber, an infrared light source and a detector, wherein the infrared light source and the detector are arranged in the optical gas chamber, and the non-spectroscopic infrared gas sensor is characterized in that: the optical air chamber is provided with a light source inlet, a light source outlet, a first reflecting surface, a second reflecting surface and a third reflecting surface, the infrared light source is positioned at the light source inlet, the detector is positioned at the light source outlet, the first reflecting surface is U-shaped and is positioned at the outer side of the infrared light source, the second reflecting surface is arc-shaped, the third reflecting surface is slope-shaped and is positioned at the light source outlet, the first reflecting surface and the second reflecting surface are positioned at the same side of the optical air chamber, and the second reflecting surface is positioned at one side opposite to the first reflecting surface and the third reflecting surface.
2. The non-spectroscopic infrared gas sensor as set forth in claim 1, wherein: the optical air chamber is a cuboid and comprises two narrow side walls, two wide side walls and two bottom surfaces, wherein the first reflecting surface and the third reflecting surface are positioned on the same narrow side wall, and the second reflecting surface is positioned on the other narrow side wall.
3. The non-spectroscopic infrared gas sensor as set forth in claim 2, wherein: the angle between the normal line of the third reflecting surface and the bottom surface is 45 degrees.
4. The non-spectroscopic infrared gas sensor as set forth in claim 2, wherein: the ratio of the distance between the center of the infrared light source and the two wide side walls is 0.17-0.19, and the ratio of the distance between the center of the infrared light source and the two narrow side walls is 9; the second reflection surface comprises a plane part positioned in the middle and light-gathering arc parts respectively positioned at two sides of the plane part; the third reflecting surface is a part of inner conical surface, the ratio of the axis of the third reflecting surface to the distance between the two wide side walls is 2.3-2.4, and the ratio of the axis of the third reflecting surface to the distance between the two narrow side walls is 1.1-1.3.
5. The non-spectroscopic infrared gas sensor as set forth in claim 1, wherein: the optical air chamber comprises an air chamber shell and an air chamber upper cover, wherein the air chamber shell is provided with a riveting lug, and the air chamber upper cover is provided with a riveting notch matched with the riveting lug.
6. The non-spectroscopic infrared gas sensor as set forth in claim 5, wherein: the air chamber shell and the air chamber upper cover are made of metal materials.
7. The non-spectroscopic infrared gas sensor as set forth in claim 5, wherein: the air chamber shell is provided with an air hole.
8. The non-spectroscopic infrared gas sensor as set forth in claim 1, wherein: the outside of the optical air chamber is sequentially provided with a waterproof breathable film, dustproof filter cotton and protective cloth.
9. The non-spectroscopic infrared gas sensor as set forth in claim 1, wherein: the infrared light source and the detector are integrated on the circuit board and are positioned on the same side of the optical plenum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320612511.3U CN219532900U (en) | 2023-03-24 | 2023-03-24 | Non-spectroscopic infrared gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320612511.3U CN219532900U (en) | 2023-03-24 | 2023-03-24 | Non-spectroscopic infrared gas sensor |
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| CN219532900U true CN219532900U (en) | 2023-08-15 |
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| CN202320612511.3U Active CN219532900U (en) | 2023-03-24 | 2023-03-24 | Non-spectroscopic infrared gas sensor |
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