CN217332159U - Gas concentration detection device - Google Patents
Gas concentration detection device Download PDFInfo
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- CN217332159U CN217332159U CN202220959655.1U CN202220959655U CN217332159U CN 217332159 U CN217332159 U CN 217332159U CN 202220959655 U CN202220959655 U CN 202220959655U CN 217332159 U CN217332159 U CN 217332159U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 a gas concentration detection device, which comprises a shell and a detection module connected with the shell, wherein the shell is provided with an optical air chamber for accommodating gas to be detected, the surface of the optical air chamber comprises a top wall and a bottom wall which are arranged at intervals, and side walls which are arranged around the top wall and the bottom wall in an enclosing way, the side walls comprise at least two first side walls which are sequentially connected along the circumferential direction of the shell, and the surface of the optical air chamber is coated with a coating for reflecting light beams; the detection module is at least partially accommodated in the optical air chamber and is provided with an emitting port and a receiving port, and partial light beams emitted by the emitting port can be reflected by the first side wall facing the emitting port and the first side wall facing the receiving port in sequence and then received by the receiving port, so that the gas concentration detection device has a small volume and a long optical path, and has the characteristics of high detection precision, good resolution and low power consumption, and is suitable for wide application in common occasions.
Description
Technical Field
The utility model relates to a sensor technical field especially relates to a gas concentration detection device.
Background
It is known that in a room with a relatively closed environment, if ventilation is not performed for a long time, the carbon dioxide content in the room gradually increases, thereby causing a hazard to human health. A gas concentration detection device has also been developed to detect the concentration of carbon dioxide gas in the air. One of the gas concentration detecting devices that is commonly used at present is a Non Dispersive Infra-Red (NDIR) gas sensor, which mainly includes an infrared light source for emitting infrared light, an optical gas chamber for reflecting the infrared light, and an infrared detector for receiving the infrared light. In the actual detection process, the working principle is that infrared light emitted by an infrared light source is reflected for multiple times in an optical gas chamber and then enters an infrared detector, and the intensity of the infrared light detected by the infrared detector is different due to the different concentrations of the gas to be detected in the optical gas chamber, so that the concentration of the gas to be detected can be obtained only by converting the detected intensity of the infrared light into a digital signal.
The detection precision, resolution ratio and power consumption are the important indexes of NDIR gas sensor, in order to improve the detection precision, the design of optical air chamber needs to have the characteristics of long light path and spotlight, traditional optical air chamber generally is the cylinder cast, but this kind of design makes the infrared light that sends from infrared light source can reach on the detector after the pipe wall multiple reflection, along with the increase of cylinder pipe, the light reflection number of times increases, because the pipe wall is once every reflection, the light intensity can be lost to some extent, the light intensity loss is great after the multiple reflection, so long light path can not generally be accomplished to traditional gas concentration detection device's optical path, and then resolution ratio is lower. And because the length of the optical gas chamber is longer, the volume of the gas concentration detection device is larger, and the power consumption is also larger. Therefore, a good optical design becomes one of the key factors for the performance of the product, and how to design a gas concentration detection device with high efficiency, small size and low power consumption becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a gas concentration detection apparatus having high detection accuracy, high resolution, and low power consumption, which is directed to the problems of low detection accuracy, low resolution, and high power consumption of the conventional gas concentration detection apparatus.
According to an aspect of the present application, there is provided a gas concentration detection apparatus including:
the gas detector comprises a shell, a gas detection device and a gas detection device, wherein the shell is provided with an optical gas chamber for containing gas to be detected, the surface of the optical gas chamber comprises a top wall and a bottom wall which are arranged at intervals, and side walls which are arranged around the top wall and the bottom wall in an enclosing manner, and the side walls comprise at least two first side walls which are sequentially connected along the circumferential direction of the shell;
the detection module is connected to the shell and at least partially accommodated in the optical gas chamber, the detection module is provided with an emitting opening facing one of the first side walls and a receiving opening facing the other first side wall, and partial light beams emitted by the emitting opening can be received by the receiving opening after being reflected by the first side wall facing the emitting opening and the first side wall facing the receiving opening in sequence so as to obtain the concentration of the gas to be detected;
wherein a surface of the optical gas cell is coated with a plating layer for reflecting the light beam.
In one embodiment, the distance between any two first side walls gradually decreases in a direction from inside the housing to outside the housing.
In one embodiment, the included angle between the first side wall and the second side wall is 90 degrees.
In one embodiment, the surface of the optical gas cell further comprises a second sidewall spaced opposite to the first sidewall at the tail portion, the second sidewall being used for reflecting the light beam reflected by the first sidewall back to the detection module; and the distance between the second side wall and the first side wall is gradually increased from the top wall of the optical air chamber to the bottom wall.
In one embodiment, the housing includes a shell with an opening at one end and a partition connected to the shell, the partition closing the opening of the shell to define the optical air chamber together with the shell.
In one embodiment, the housing is provided with a ventilation hole for communicating the external environment with the optical gas chamber, and the gas to be measured can enter the optical gas chamber through the ventilation hole.
In one embodiment, the casing further includes a gas permeable membrane covering the ventilation hole, the gas permeable membrane has a plurality of ventilation holes arranged at intervals, and the pore diameter of each ventilation hole is larger than the outer diameter of the molecule of the gas to be measured and smaller than the outer diameter of the molecule of the moisture.
In one embodiment, the detection module comprises a substrate, a light source and a detector, the substrate is connected with the housing, and the light source and the detector are respectively electrically connected with the substrate and respectively penetrate through the housing to be accommodated in the optical air chamber; the light source forms the transmitting opening, and the detector forms the receiving opening.
In one embodiment, the plating is a true gold plating.
In one embodiment, the thickness of the gold plating layer is 0.075 ± 0.025 um.
Above-mentioned gas concentration detection device, top wall and diapire through being equipped with the interval setting on the surface of the optics air chamber at the casing and enclose and establish the lateral wall all around at top wall and diapire, the lateral wall includes at least two first lateral walls along the circumference of casing connection simultaneously, detection module has the transmission mouth towards one of them first lateral wall and the receiving port towards another first lateral wall, the partial light beam of transmission mouth transmission can be received by the receiving port after being reflected by the first lateral wall towards the first lateral wall of transmission mouth and the first lateral wall towards the receiving port in proper order. Under the condition that the light intensity emitted by the light source is constant, the absorption degree of the light beams by the gas to be detected with different concentrations is different, so that after the emitted light beams are absorbed by the gas to be detected with different concentrations, the light intensity of the residual light beams reflected by the first side wall is different, when the detection module receives the light beams reflected by the first side wall, the light intensity signals of the light beams can be obtained, and then the light intensity signals are processed to obtain the concentration of the gas to be detected. The design of the optical air chamber ensures that the optical air chamber has a longer optical path while having a smaller volume, so that the gas concentration detection device has the characteristics of high detection precision, good resolution and low power consumption, and is suitable for wide application in common occasions.
Drawings
Fig. 1 is an exploded schematic view of a gas concentration detection apparatus provided by the present invention;
fig. 2 is an exploded schematic view of a housing of the gas concentration detection apparatus provided by the present invention;
fig. 3 is a sectional view of the gas concentration detection apparatus provided by the present invention;
fig. 4 is a schematic view of the main beam direction of the gas concentration detecting device provided by the present invention.
Description of reference numerals:
10. a gas concentration detection device;
100. a housing; 101. an optical gas cell; 1011. a top wall; 1012. a side wall; 1012a, a first sidewall; 1012b, a second side wall; 1013. a bottom wall; 110. a housing; 111. an accommodating chamber; 113. a ventilation hole; 114. a gas permeable membrane; 120. a partition plate; 121. a through hole;
300. a detection module; 310. a substrate; 311. a pin; 320. a light source; 330. a detector; 500. a connecting member.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An embodiment of the utility model provides a gas concentration detection device can be used to detect the concentration of gases such as carbon dioxide in the air. The gas to be detected can enter the gas concentration detection device, the gas to be detected entering the gas concentration detection device can absorb a part of infrared light emitted in the gas concentration detection device, and the gas concentration detection device can calculate the concentration of the gas to be detected by measuring the light intensity of the residual unabsorbed infrared light because the gas to be detected with different concentrations has different absorption degrees to the infrared light.
The following describes the structure of the gas concentration detection device in the present application by taking the gas concentration detection device as an NDIR gas sensor for detecting carbon dioxide in air as an example, and the present embodiment is only used as an example and does not limit the technical scope of the present application. It is to be understood that, in other embodiments, the gas concentration detection apparatus of the present application is not limited to detecting the concentration of carbon dioxide gas, and may also detect the concentration of other types of gases to be detected, and is not limited herein.
A preferred embodiment of the gas concentration detection apparatus will be described with reference to fig. 1 to 4.
As shown in fig. 1, a gas concentration detection apparatus 10 includes a housing 100 and a detection module 300. In the present embodiment, the gas concentration detection device 10 is an NDIR gas sensor. The housing 100 has an optical gas chamber 101 for accommodating a gas to be detected, the detection module 300 is connected to the housing 100 and is partially accommodated in the optical gas chamber 101, the detection module 300 has an emission port and a receiving port, and a part of light beams emitted from the emission port can be reflected in the detection module 300 and then received by the receiving port to obtain the concentration of the gas to be detected accommodated in the optical gas chamber 101.
Specifically, the detection module 300 includes a substrate 310, a light source 320, and a detector 330, the substrate 310 is connected to the housing 100 through a connector 500, such as a self-tapping screw, the light source 320 and the detector 330 are respectively electrically connected to the substrate 310 and respectively penetrate through the housing 100 to be accommodated in the optical air chamber 101, the light source 320 and the detector 330 are located at one end of the optical air chamber 101 along a first direction, and are located at two opposite ends of the optical air chamber 101 along a second direction at intervals and symmetrically with a plane parallel to the first direction as a symmetry plane. The light source 320 is used for emitting a broad-spectrum visible light beam 20, such as infrared light, so as to form an emission port of the detection module 300; the detector 330 is used for receiving the light beam not absorbed by the gas to be detected and calculating the light intensity thereof to obtain the concentration of the gas to be detected, thereby forming a receiving opening of the detection module 300. The substrate 310 is disposed with a control circuit for supplying power to the light source 320 and the detector 330, and the substrate 310 has a plurality of pins 311 arranged at intervals for transmitting data. In the figure, the X direction is a first direction, the Y direction is a second direction, and the X direction and the Y direction are perpendicular to each other.
As shown in fig. 1 to 3, the case 100 includes an outer shell 110 and a partition 120 coupled to the outer shell 110. In an alternative embodiment, the housing 110 defines a receiving cavity 111 with an opening at one end, the receiving cavity 111 has a top wall and a side wall, and the partition 120 closes the opening of the housing 110 to define the optical air chamber 101 together with the housing 110. Specifically, the top wall of the accommodating cavity 111, the side wall of the accommodating cavity 111 and the side of the partition 120 close to the accommodating cavity 111 together constitute the surface of the optical gas cell 101, such that the surface of the optical gas cell 101 includes a top wall 1011 and a bottom wall 1013 arranged at intervals, and a side wall 1012 arranged around the top wall 1011 and the bottom wall 1013. The top wall 1011 is a top wall of the accommodating cavity 111, the bottom wall 1013 is a side surface of the partition 120 near the accommodating cavity 111, and the side wall 1012 is a side wall of the accommodating cavity 111. The partition 120 is provided with two through holes 121 corresponding to the light source 320 and the detector 330 in size at positions corresponding to the light source 320 and the detector 330, so that the light source 320 and the detector 330 can pass through the two through holes 121 respectively to be accommodated in the optical gas chamber 101.
According to the principle of non-dispersive infrared (NDIR), when a beam of parallel monochromatic light passes through a uniform and non-scattering light-absorbing substance perpendicularly, the absorbance is proportional to the concentration of the light-absorbing substance and the thickness of the absorbing layer. Based on this, when the gas concentration detection apparatus 10 provided by the present application is used to detect the concentration of the gas to be detected, the gas to be detected enters the optical gas chamber 101 of the housing 100, the light source 320 enters the infrared light into the optical gas chamber 101 from one end of the optical gas chamber 101, at this time, a part of the infrared light with a specific wavelength is absorbed by the gas to be detected in the optical gas chamber 101, the remaining unabsorbed gas is reflected by the surface of the optical gas chamber 101 and then reflected to the detector 330, the radiation intensity of the infrared light is detected by the detector 330, according to the principle that the absorbance is proportional to the concentration of the light absorbing substance and the thickness of the absorbing layer described in the non-dispersive infrared (NDIR) principle, when the concentration of the gas to be detected in the environment is different, the intensity of the infrared light detected by the detector 330 is also different, and at this time, the voltage value obtained by the conversion output of the absorbed infrared light is also correspondingly changed, therefore, the light intensity value which can be displayed and read can be obtained by converting the voltage value, and the concentration of the gas to be measured can be obtained.
It can be seen that the surface of the optical gas cell 101 mainly acts as a reflection of the light beam, so that the infrared light not absorbed by the gas to be detected can be focused to the detector 330 for detection. However, as described in the background art, the detection accuracy, the resolution and the power consumption are all important indexes of the NDIR gas sensor, in order to improve the detection accuracy, the design of the optical gas chamber 101 needs to have the characteristics of a long optical path and light condensation, the conventional optical gas chamber is generally of a cylindrical tube type, but the infrared light emitted from the light source 320 can reach the detector 330 after being reflected for multiple times by the tube wall due to the design, the light reflection times increase along with the increase of the cylindrical tube, the light intensity is lost every time the tube wall is reflected once, and the light intensity loss is large after being reflected for multiple times, so the optical path of the conventional gas concentration detection device cannot be long, and the resolution is low. And the length of the optical gas chamber is long, so that the volume of the gas concentration detection device 10 is large, and the power consumption is also large.
In order to solve the problem, the inventor conducts an intensive study, designs the optical gas chamber 101 into a polygonal cavity structure, conducts a study on stray light of a main light path, continuously adjusts the structure of the optical gas chamber 101, obtains an optimal solution of the optical path length through simulation, and finally determines the final shape of the optical gas chamber 101. Therefore, the gas concentration detection device 10 provided by the application can have a relatively long optical path by the infrared light beam emitted by the light source 320 through the inner wall of the optical air chamber 101 without irregular reflection for too many times while having a relatively small volume, so that the gas concentration detection device 10 has the characteristics of high detection precision, good resolution and low power consumption.
Specifically, in the present embodiment, as shown in fig. 2 and 3, the side wall 1012 of the optical gas cell 101 includes three first side walls 1012a connected end to end in sequence along the circumferential direction of the housing 100, and the first side walls 1012a are used for reflecting the infrared light beam 20 incident from the light source 320. The first side wall 1012a at the middle is parallel to the second direction, the two first side walls 1012a at the head and tail ends are symmetrically and obliquely arranged with the plane parallel to the first direction as a symmetry plane, and the distance between the two first side walls 1012a at the head and tail ends is gradually reduced from the inside of the casing 100 to the outside of the casing 100. Preferably, the included angle between the two first sidewalls 1012a at the head and the tail is 90 °, and all the first sidewalls 1012a are located at the opposite end of the optical gas cell 101 away from the light source 320 and the detector 330 along the first direction, wherein the first sidewall 1012a at the head faces the light source 320 along the first direction and the first sidewall 1012a at the tail faces the detector 330 along the first direction.
Preferably, the sidewall 1012 of the optical chamber 101 further includes a second sidewall 1012b, the second sidewall 1012b is spaced apart from the first sidewall 1012a at the end portion in the first direction, and the second sidewall 1012b is located beside the detector 330, and the distance between the second sidewall 1012b and the first sidewall 1012a gradually increases from the top wall 1011 to the bottom wall 1013 of the optical chamber 101, and the second sidewall 1012b may be a circular arc surface as shown in fig. 3 or an inclined surface. The purpose of adding the second side wall 1012b is to focus the infrared light beams 20 reflected by the first side wall 1012a to the detector 330, so that the infrared light beams 20 reflected by the plurality of first side walls 1012a can be focused together by the second side plate to be incident to the detector 330, so as to be completely received by the detector 330, and the light beams are prevented from scattering around in the optical gas cell 101, which results in the accuracy of the detection result being reduced.
Referring to fig. 4, the line with arrows is the main beam path, and by the above design, the infrared beam 20 emitted from the light source 320 can be incident on the first sidewall 1012a of the head portion along the first direction (i.e. toward the first sidewall 1012a of the light source 320 along the first direction), since the angle a between the first side wall 1012a at the head and the first side wall 1012a at the tail is 90 °, the infrared light beam 20, after being reflected by the first side wall 1012a at the head, can be reflected at an angle of 90 deg. to the original incident light path (i.e. in the second direction) to the first sidewall 1012a at the tail (i.e. towards the first sidewall 1012a of the detector 330 in the first direction), then, the light beam is incident on the second sidewall 1012b at an angle parallel to the original incident light path (i.e., along the first direction), and finally, the reflected light beam 20 is focused by the second sidewall 1012b into the detector 330.
Thus, the infrared beam 20 emitted from the light source 320 can be reflected three times to expand the light path, so that the main beam 20 can be reflected into the detector 330 more effectively and intuitively. Through simulation measurement, the length of the average optical path is 90.6mm due to the expansion of the optical path, and the effective utilization rate of the luminous flux (namely the absorbed luminous flux/the emitted luminous flux) is 1.21%, so that the gas concentration detection device 10 provided by the application has a longer optical path and higher resolution.
It should be noted that the number of the first side walls 1012a is not limited to three as shown in the embodiment in the figure, and may be only two or more, for example, two first side walls 1012 may be connected end to end along the circumferential direction of the casing 100 and disposed at 90 °, or multiple first side walls 1012 may be connected end to end sequentially along the circumferential direction of the casing 100. As long as it is ensured that the side wall 1012 at least includes two first side walls 1012a connected end to end in sequence, the first side wall 1012a located at the head and the light source 320 are arranged oppositely along the first direction, the first side wall 1012a located at the tail and the detector 330 are arranged oppositely along the first direction, and in the direction pointing to the outside of the housing 100 from the inside of the housing 100, the distance between the two first side walls 1012a located at the end to end is gradually reduced, and the included angle between the two first side walls is 90 °, so that the infrared light beam 20 emitted by the light source 320 can have an optimal light path expansion and be reflected into the detector 330.
In addition, as shown in fig. 1, the housing 110 is further provided with two ventilation holes 113 for communicating the external environment with the optical air chamber 101, in the embodiment shown in fig. 1, the ventilation holes 113 are spaced from the top wall 1011 of the housing 110, so that the optical air chamber 101 can exchange with the external air at any time, and the carbon dioxide gas in the air can enter the optical air chamber 101 through the ventilation holes 113 at any time, thereby achieving the function of detecting the concentration of the carbon dioxide gas in the air. The ventilation hole 113 is not limited to be formed in the top wall 1011 of the housing cavity 111 of the housing 110, and may be formed in the side wall 1012 of the housing cavity 111 of the housing 110 as long as the external environment and the optical air chamber 101 can communicate with each other.
In some embodiments, when the gas detection apparatus provided by the present application needs to detect the concentration of some specific gases, a detachable sealing plate or a detachable sealing film may be further installed at the position of the ventilation hole 113, so that the gas to be detected is introduced into the optical gas chamber 101 to seal the optical gas chamber 101, and the external air is prevented from entering the optical gas chamber 101 to affect the detection result of the concentration of the specific gases.
More preferably, moisture molecules in the outside air can interfere with the accuracy of the measurement and interfere with the absorption peak of the infrared beam 20. In order to prevent moisture from the external environment from entering the optical air chamber 101, the housing 100 further includes a gas permeable membrane 114 for covering the ventilation hole 113. The gas permeable membrane 114 is preferably made of a fiber material, and has a plurality of gas permeable holes arranged at intervals, each gas permeable hole communicates with the external environment and the optical gas chamber 101, and has a hole diameter larger than the outer diameter of the molecule of the gas to be detected and smaller than the outer diameter of the molecule of the moisture, so that the gas concentration detection apparatus 10 can not only prevent the gas affecting the external environment from entering the optical gas chamber 101 during detection, but also prevent the moisture in the external environment from entering the optical gas chamber 101.
Further, in order to make the surface of the optical gas cell 101 have better reflectivity, in an alternative embodiment, the surface of the optical gas cell 101 may be coated with a plating layer which is easy to reflect the infrared light beam 20. The plating layer is formed by plating a layer of metal on the surface of the optical air chamber 101 by electroplating, sputtering, and the like, and can be formed by plating a plurality of metals, such as gold plating, silver plating, aluminum plating, chromium plating, and the like. The best embodiment is that the coating is finally obtained as a true gold coating after the inventor repeatedly tests and compares the reflection effects of the various metal coatings, for example, indexes such as reflectivity, signal intensity and the like are compared; meanwhile, through simulation calculation, the optimal plating thickness is 0.075 +/-0.025 um when the plating layer is a true gold plating layer, and the plating layer can have the optimal reflection effect when the plating layer has the above size.
The gas concentration detection apparatus 10 has at least the following technical effects: the optical air chamber 101 is designed into a cavity with side walls 1012 comprising at least two first side walls 1012a, the first side walls 1012a and the last side walls 1012a are symmetrically arranged and form an included angle of 90 degrees, the infrared light beam 20 is reflected for three times by utilizing the non-dispersive infrared (NDIR) principle to expand the light path, the gas concentration detection device 10 is small in size, and meanwhile, the gas concentration detection device 10 can also ensure that the gas concentration detection device has a long light path and a reflection effect, and the precise optical design enables the gas concentration detection device 10 provided by the application to have the characteristics of high signal intensity, high detection precision, high resolution, low power consumption and the like.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the technical features should be considered as the scope of the present description.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A gas concentration detection apparatus, characterized by comprising:
the gas detector comprises a shell, a gas detection device and a gas detection device, wherein the shell is provided with an optical gas chamber for containing gas to be detected, the surface of the optical gas chamber comprises a top wall and a bottom wall which are arranged at intervals, and side walls which are arranged around the top wall and the bottom wall in an enclosing manner, and the side walls comprise at least two first side walls which are sequentially connected along the circumferential direction of the shell;
the detection module is connected to the shell and at least partially accommodated in the optical gas chamber, the detection module is provided with an emitting opening facing one of the first side walls and a receiving opening facing the other first side wall, and partial light beams emitted by the emitting opening can be received by the receiving opening after being reflected by the first side wall facing the emitting opening and the first side wall facing the receiving opening in sequence so as to obtain the concentration of the gas to be detected;
wherein a surface of the optical gas cell is coated with a plating layer for reflecting the light beam.
2. The gas concentration detection apparatus according to claim 1, wherein a distance between any two of the first side walls gradually decreases in a direction from inside the housing toward outside the housing.
3. The gas concentration detection apparatus according to claim 2, wherein an angle between the first side wall and the second side wall is 90 °.
4. The gas concentration detection apparatus of claim 2, wherein the surface of the optical gas cell further comprises a second sidewall spaced opposite the first sidewall at the tail portion, the second sidewall for reflecting the light beam reflected by the first sidewall back to the detection module; and the distance between the second side wall and the first side wall is gradually increased from the top wall of the optical air chamber to the bottom wall.
5. The gas concentration detection apparatus according to claim 1, wherein the housing includes a case open at one end and a partition plate connected to the case, the partition plate closing the opening of the case to define together with the case the optical gas chamber.
6. The apparatus according to claim 5, wherein the housing defines a ventilation hole for communicating the external environment with the optical gas chamber, and the gas to be measured can enter the optical gas chamber through the ventilation hole.
7. The gas concentration detection apparatus according to claim 6, wherein the housing further comprises a gas permeable membrane covering the ventilation hole, the gas permeable membrane having a plurality of ventilation holes arranged at intervals, and a pore diameter of each of the ventilation holes is larger than an outer diameter of a molecule of the gas to be measured and smaller than an outer diameter of a molecule of moisture.
8. The gas concentration detection apparatus according to claim 1, wherein the detection module comprises a substrate, a light source and a detector, the substrate is connected to the housing, and the light source and the detector are respectively electrically connected to the substrate and respectively penetrate through the housing to be accommodated in the optical gas chamber; the light source forms the transmitting opening, and the detector forms the receiving opening.
9. The gas concentration detection apparatus according to claim 1, wherein the plating layer is a true gold plating layer.
10. The gas concentration detection apparatus according to claim 9, wherein the thickness of the genuine gold plating layer is 0.075 ± 0.025 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220959655.1U CN217332159U (en) | 2022-04-21 | 2022-04-21 | Gas concentration detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220959655.1U CN217332159U (en) | 2022-04-21 | 2022-04-21 | Gas concentration detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093662A1 (en) * | 2022-11-03 | 2024-05-10 | 杭州三花研究院有限公司 | Gas detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093662A1 (en) * | 2022-11-03 | 2024-05-10 | 杭州三花研究院有限公司 | Gas detection device |
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