CN114324227B - Infrared gas sensor - Google Patents
Infrared gas sensor Download PDFInfo
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- CN114324227B CN114324227B CN202111655582.3A CN202111655582A CN114324227B CN 114324227 B CN114324227 B CN 114324227B CN 202111655582 A CN202111655582 A CN 202111655582A CN 114324227 B CN114324227 B CN 114324227B
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- 230000003287 optical effect Effects 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 3
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- 238000007747 plating Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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Abstract
The invention discloses an infrared gas sensor, which comprises a shell, an infrared light source and an infrared detector, wherein the shell comprises a first shell and a second shell connected with the first shell, the first shell is provided with a first cavity, the second shell is provided with a second cavity, the second shell is provided with a first channel and a second channel which are arranged at intervals, the first channel and the second channel are communicated with the first cavity, the second shell is provided with a first through hole communicated with the second cavity, the second shell is provided with a second through hole communicated with the first cavity and the second cavity, the infrared light source is arranged in the first channel, and the infrared detector is arranged in the second channel. The infrared gas sensor can avoid infrared light leakage and improve the detection efficiency of the infrared detector.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to an infrared gas sensor.
Background
The infrared gas sensor is a gas sensing device which selects absorption characteristics based on near infrared spectrums of different gas molecules, and utilizes the relation between gas concentration and absorption intensity to identify gas components and determine the concentration of the gas components. The infrared gas sensor includes an infrared light source, an infrared detector, and an optical plenum that confines infrared light therein. After the infrared light absorbs the gas to be detected, the light intensity of the infrared light is weakened, so that the change of the light intensity of the infrared light is detected by adopting an infrared detector, and the concentration of the gas to be detected is obtained.
However, the infrared detectors of the existing infrared gas sensors have low detection efficiency, and there is a need for improvement.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
An infrared gas sensor, comprising:
The shell comprises a first shell and a second shell, wherein the first shell is provided with a first cavity, the second shell is provided with a second cavity, the second shell is provided with a first channel and a second channel which are arranged at intervals, the first channel and the second channel are communicated with the first cavity, the second shell is provided with a first through hole communicated with the second cavity, and the second shell is provided with a second through hole communicated with the first cavity and the second cavity;
The second shell comprises a second top wall, a second left side wall and a second right side wall opposite to the second left side wall, a plurality of first through holes and a plurality of second through holes are formed in the second left side wall and the second right side wall, the second through holes are formed in the second top wall, the second left side wall and the second right side wall are provided with bottom surfaces facing the circuit board, and the first through holes are a certain distance from the bottom surfaces;
the infrared light source is arranged in the first channel;
and the infrared detector is arranged in the second channel.
Drawings
Fig. 1 is an overall structural diagram of an infrared gas sensor according to an embodiment of the present invention.
Fig. 2 is an exploded view of an infrared gas sensor according to an embodiment of the present invention.
Fig. 3 is a bottom view of a first housing of an infrared gas sensor in accordance with an embodiment of the present invention.
Fig. 4 is a bottom-up block diagram of a first housing of an infrared gas sensor according to an embodiment of the present invention.
Fig. 5 is a structural view of a second housing of the infrared gas sensor according to an embodiment of the present invention.
Fig. 6 is a cross-sectional view of a second housing of an infrared gas sensor according to an embodiment of the present invention.
Fig. 7-9 are schematic infrared light transmission diagrams of an infrared gas sensor according to embodiments of the present invention.
Reference numerals:
Housing 1, first housing 11, first chamber 110, first sidewall 111, second sidewall 112, third sidewall 113, fourth sidewall 114, fifth sidewall 115, sixth sidewall 116, second housing 12, second chamber 120, first channel 121, first segment 1211, second segment 1212, third segment 1213, second channel 122, second left sidewall 123, second right sidewall 124, infrared light source 2, infrared detector 3, through-hole 4, first through-hole 41, second through-hole 42, first reflective surface 5, second reflective surface 6, third reflective surface 7, fourth reflective surface 8, circuit board 9, reflective cup 10, cylindrical segment 101, parabolic segment 102.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention. In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 9, an infrared gas sensor according to an embodiment of the present invention includes a housing 1, an infrared light source 2, and an infrared detector 3, and a through hole 4 is provided in the housing 1. In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium.
The housing 1 includes a first housing 11 and a second housing 12 connected to each other. In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
As shown in fig. 2,3 and 4, the first housing 11 has a first chamber 110, the second housing 12 has a second chamber 120, the second housing 12 is provided with a first passage 121 and a second passage 122 which are arranged at intervals, the first passage 121 communicates with the first chamber 110, the second passage 122 also communicates with the first chamber 110, the infrared light source 2 is provided in the first passage 121, and the infrared detector 3 is provided in the second passage 122.
The second casing 12 is provided with a through hole 4, the through hole 4 comprises a first through hole 41 and a second through hole 42, the first through hole 41 is communicated with the second chamber 120, the second through hole 42 is communicated with the second chamber 120 and the first chamber 110, so that gas to be tested enters the second chamber 120 through the first through hole 41, and gas in the second chamber 120 enters the first chamber 110 through the second through hole 42.
The infrared light emitted by the infrared light source 2 is transmitted into the first chamber 110 of the first housing 11 along the first channel 121, and is transmitted to the infrared detector 3 through the second channel 122 after multiple reflections are completed in the first chamber 110.
Specifically, the material of the housing 1 is brass, aluminum alloy, plastic, glass, or the like. The infrared light source 2 may be infrared light generated by filament heating and light emitting, or may be an infrared LED light source, and it is understood that the present invention is not limited thereto. The infrared detector 3 is a pyroelectric infrared detector, a thermopile infrared detector, a thermal conductivity infrared detector and the like, wherein the detection channel of the infrared detector 3 can be a single channel for single gas detection or multiple channels for multiple gas detection.
According to the infrared gas sensor provided by the embodiment of the invention, the first through hole 41 and the second through hole 42 are formed in the second shell 12 so that gas enters the first cavity 110 of the first shell 11 through the second cavity 120 of the second shell 12, and the first shell 11 is not provided with the through hole communicated with the first cavity 110, so that leakage of infrared light in the transmission process can be reduced, the light source utilization rate and the infrared detector acceptance rate are improved, and the detection efficiency is improved.
Specifically, the first through hole 41 is provided in a side wall of the second housing 12, so that the gas to be measured is provided in a top wall of the second housing 12 through the second through hole 42 in the side wall. Further, the first through holes 41 and the second through holes 42 are provided in plurality, in other words, the side wall of the second housing 12 is provided with a plurality of first through holes 41, and the top wall of the second housing 12 is provided with a plurality of second through holes 42, so as to improve air intake efficiency. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In some embodiments, as shown in fig. 2 and 5, the side wall of the second housing 12 includes a second left side wall 123 and a second right side wall 124, the second right side wall 124 and the second left side wall 123 are spaced apart from each other, and the first through holes 41 are provided on the second left side wall 123 and the second right side wall 124, in other words, the first through holes 41 are provided on both the second left side wall 123 and the second right side wall 124, specifically, a plurality of first through holes 41 are provided on the second left side wall 123, and a plurality of first through holes 41 are also provided on the second right side wall 124.
The second chamber 120 is provided with a partition board, the partition board divides the second chamber 120 into a second left chamber and a second right chamber, the first through hole 41 on the second left side wall 123 is communicated with the second left chamber, and the first through hole 41 on the second right side wall 124 is communicated with the second right chamber. It will be appreciated that by separating the second chamber 120 by the partition plate, it is possible to prevent the gas entering the second chamber 120 from the first through hole 41 of the second left side wall 123 from leaking out of the first through hole 41 of the second right side wall 124, and to prevent the gas entering the second chamber 120 from the first through hole 41 of the second right side wall 124 from leaking out of the first through hole 41 of the second left side wall 123, thereby preventing the gas to be measured from failing to enter the first chamber 110 from within the second chamber 120.
In some embodiments, as shown in fig. 2,3 and 4, the inner surface of the side wall of the first housing 11 is provided with a first reflecting surface 5, a second reflecting surface 6, a third reflecting surface 7 and a fourth reflecting surface 8, that is, the side wall surface surrounding the first chamber 110 is provided with the first reflecting surface 5, the second reflecting surface 6, the third reflecting surface 7 and the fourth reflecting surface 8.
As shown in fig. 2 and 5, the second housing 12 is provided with a first channel 121 and a second channel 122 which are arranged at intervals, the first channel 121 is communicated with the first chamber 110, the second channel 122 is communicated with the first chamber 110, the infrared light source 2 is arranged in the first channel 121, the infrared detector 3 is arranged in the second channel 122, wherein the infrared light emitted by the infrared light source 2 is transmitted to the first reflecting surface 5 along the first channel 121 and is reflected to the fourth reflecting surface 8 sequentially through the first reflecting surface 5, the second reflecting surface 6 and the third reflecting surface 7, the infrared light incident on the fourth reflecting surface 8 is reflected by the fourth reflecting surface 8 and is transmitted to the infrared detector 3 along the second channel 122, the plane of the optical path of the infrared light in the first channel 121 and the plane of the optical path in the second channel 122 are first planes, and it can be understood that the transmission of the infrared light in the first planes is limited in the first channel 121 and the second channel 121, and the receiving rate of the light beam can be improved. The plane of the light path of the infrared light reflected to the fourth reflecting surface 8 by the first reflecting surface 5, the second reflecting surface 6 and the third reflecting surface 7 in sequence is a second plane, and the second plane and the first plane are perpendicular to each other.
In other words, the transmission path of the infrared light is that the infrared light of the infrared light source 2 is transmitted to the first reflecting surface 5 along the first channel 121 and is reflected to the second reflecting surface 6 (as shown in fig. 7) by the first reflecting surface 5, the infrared light incident to the second reflecting surface 6 is reflected to the third reflecting surface 7 by the second reflecting surface 6, the infrared light incident to the third reflecting surface 7 is reflected to the fourth reflecting surface 8 (as shown in fig. 8) by the third reflecting surface 7, the infrared light incident to the fourth reflecting surface 8 is reflected by the fourth reflecting surface 8 and is transmitted to the infrared detector 3 along the second channel 122 (as shown in fig. 9), wherein the plane in which the infrared light is transmitted in the first channel 121 and the second channel 122 is perpendicular to the plane in which the infrared light is reflected by the first reflecting surface 5, the second reflecting surface 6, the third reflecting surface 7 and the fourth reflecting surface 8 in sequence, that the infrared light is transmitted in two planes.
It can be appreciated that by transmitting infrared light in two planes perpendicular to each other, the space of the infrared gas sensor is fully utilized, and light beam transmission with a large optical path can be realized in a smaller space, so that the volume of the infrared gas sensor can be reduced.
In some embodiments, as shown in fig. 3 and 4, the side walls of the first housing 11 include a first side wall 111, a second side wall 112, a third side wall 113, a fourth side wall 114, a fifth side wall 115, and a sixth side wall 116 that are sequentially connected and define the first chamber 110, the inner surface of the first side wall 111 is inclined outwardly by 45 ° in a direction toward the second housing 12, the second side wall 112 and the sixth side wall 116 are parallel to each other, the third side wall 113 and the fifth side wall 115 are inclined by 45 ° with respect to the fourth side wall 114, and an included angle between the third side wall 113 and the fifth side wall 115 is 90 °, the first reflecting surface 5 and the fourth reflecting surface 8 are disposed on the inner surface of the first side wall 111 and are spaced apart from each other, the second reflecting surface 6 is disposed on the inner surface of the third side wall 113, and the third reflecting surface 7 is disposed on the inner surface of the fifth side wall 115. Here, the direction defined toward the first chamber 110 is inward, and the direction away from the first chamber 110 is outward.
In other words, the outer peripheral outline of the cross section of the first housing 11 is substantially hexagonal, the first chamber 110 of the first housing 11 is surrounded by the first side wall 111, the second side wall 112, the third side wall 113, the fourth side wall 114, the fifth side wall 115 and the sixth side wall 116, the second side wall 112 and the sixth side wall 116 are parallel to each other and are arranged at intervals, the inner surface of the first side wall 111 is inclined 45 ° from inside to outside in the direction from the first housing 11 to the second housing 12, the third side wall 113 and the fifth side wall 115 are inclined 45 ° with respect to the fourth side wall 114, and the included angle between the third side wall 113 and the fifth side wall 115 is 90 °, wherein the first reflecting surface 5 and the fourth reflecting surface 8 are provided on the inner surface of the first side wall 111 and are spaced apart from each other, that is, the first reflecting surface 5 and the fourth reflecting surface 8 are inclined 45 ° from inside to outside in the direction from the first housing 11 to the second housing 12, so that the first reflecting surface 5 receives the infrared light in the first channel 121 and reflects to the second reflecting surface 6, and the light incident on the fourth reflecting surface 8 is reflected to the second channel 122 along the second channel 122; the second reflecting surface 6 is disposed on the inner surface of the third side wall 113, the third reflecting surface 7 is disposed on the inner surface of the fifth side wall 115, that is, the second reflecting surface 6 and the third reflecting surface 7 are inclined 45 ° with respect to the fourth side wall 114, and the included angle between the second reflecting surface 6 and the third reflecting surface 7 is 90 °, so that the light incident on the first reflecting surface 5 is reflected on the fourth reflecting surface 8 sequentially through the second reflecting surface 6 and the third reflecting surface 8.
Specifically, the fourth sidewall 114 is perpendicular to the second sidewall 112 and also perpendicular to the sixth sidewall 116, the length of the fourth sidewall 114 is smaller than the spacing between the second sidewall 112 and the sixth sidewall 116, the angle between the inner surface of the fourth sidewall 114 and the inner surface of the third sidewall 113 is 135 °, and the angle between the inner surface of the fourth sidewall 114 and the inner surface of the fifth sidewall 115 is 135 °.
More specifically, the inner surface of the first sidewall 111 includes a first inner surface and a second inner surface that are spaced apart from each other, and the first inner surface is located inside the second inner surface, the first reflecting surface 5 is provided at the first inner surface, and the fourth reflecting surface 8 is provided at the second inner surface, that is, the first reflecting surface 5 is located inside the fourth reflecting surface 8.
In some embodiments, as shown in fig. 5, the axial directions of the first channel 121 and the second channel 122 are parallel. It will be appreciated that the axial parallelism of the first passage 121 and the second passage 122 is within the tolerances allowed in the art.
In some embodiments, the second housing 12 is provided at the bottom of the first housing 11, and the first channel 121 and the second channel 122 each extend downward from the upper surface of the top wall of the second housing 12 and to the bottom of the second housing 12. In other words, the first and second housings 11 and 12 are disposed in order in the top-to-bottom direction and connected to each other, and the first and second passages 121 and 122 each extend downward from the upper surface of the second housing 12 and extend to the bottom of the second housing 12.
In some embodiments, as shown in fig. 2,5 and 6, the infrared gas sensor further includes a circuit board 9, the bottom opening of the second housing 12, that is, the bottom opening of the second housing 12, is disposed, the circuit board 9 is disposed at the bottom of the second housing 12, and the infrared light source 2 and the infrared detector 3 are both disposed on the upper surface of the circuit board 9. In other words, the infrared light source 2 is disposed on the upper surface of the circuit board 9 and located at the bottom end in the first channel 121, and the infrared detector 3 is disposed on the lower surface of the circuit board 9 and located at the bottom end in the second channel 122.
Specifically, the circuit board 9 is provided with a signal processing circuit, and the signal processing circuit can obtain a real-time data value of the infrared detector 3 and perform filtering, amplification, temperature compensation and digital-to-analog conversion on a voltage signal generated by the infrared detector 3. The signal processing circuit can also modulate the infrared light source 2 in a pulse mode to enable the infrared light source 2 to periodically emit light.
In some embodiments, as shown in fig. 6, the infrared gas sensor further comprises a reflector cup 10, wherein the reflector cup 10 is nested within the first channel 121 and abuts against the inner surface of the first channel 121, and the infrared light source 3 is disposed within the reflector cup 10. Specifically, the reflector cup 10 nests within the bottom end of the first channel 121. The reflector cup is used as one of the reflecting devices, and the reflecting device is used for controlling the illumination distance and the illumination area of the main light spot through the light reflector in order to utilize limited light energy.
In some alternative embodiments, reflector cup 10 comprises a cylindrical section 101 and a parabolic section 102, with parabolic section 102 being connected to the upper end of cylindrical section 101, in particular, the inner diameter of cylindrical section 101 is uniform along the axial direction of first channel 121, i.e. the inner diameter of cylindrical section 101 remains constant along the axial direction of first channel 121.
The first channel 121 comprises a first segment 1211, a second segment 1212 and a third segment 1213 which are connected in sequence from bottom to top, wherein the outer circumferential contour of the cylindrical segment 101 is matched with the inner circumferential contour of the first segment 1211, the inner circumferential contour of the parabolic segment 102 is matched with the inner circumferential contour of the second segment 1212, and the inner diameter of the third segment 1213 is constant along the axial direction of the first channel 121, i.e. the inner diameter of the third segment 1213 is kept constant along the axial direction of the first channel 121.
The reflector cup 10 with the above structure is suitable for an infrared light source generated by heating and lighting a filament with a certain height, and the structure can be beneficial to placing the light emitting surface of the filament on the focal plane of the parabolic reflecting surface of the parabolic section 102. It will be appreciated that the configuration of the reflector cup 10 is not so limited, for example, in alternative embodiments the reflector cup 10 is integrally formed as a parabolic reflector surface. The reflector cup 10 of this construction is suitable for use with thinner infrared LED light sources.
In some embodiments, the inner surface of the sidewall of the first housing 11 is plated with a gold film to form the first, second, third and fourth reflective surfaces 5, 6, 7 and 8. In other words, the reflective surface is formed by plating a gold film on the inner surface of the sidewall of the first housing 11, specifically, plating a gold film after polishing the inner surface of the sidewall of the first housing 11, which is beneficial to total reflection of light, reduces loss, and also avoids oxidation of materials.
An infrared gas sensor according to an embodiment of the present invention is described below with reference to fig. 1 to 9.
As shown in fig. 1 to 9, the infrared gas sensor according to the embodiment of the invention includes a housing 1, an infrared light source 2, an infrared detector 3, a circuit board 9 and a reflective cup 10, wherein the material of the housing 1 is brass, aluminum alloy, plastic or glass, and the infrared light source 2 can be infrared light generated by heating and lighting a filament. The infrared detector 3 is a pyroelectric infrared detector, a thermopile infrared detector, a thermal conductivity infrared detector and the like, wherein the detection channel of the infrared detector 3 can be a single channel for single gas detection or multiple channels for multiple gas detection.
The longitudinal direction of the housing 1 is defined as the left-right direction, the width direction of the housing 1 is defined as the front-back direction, the height direction of the housing 1 is defined as the up-down direction, and the direction toward the inside of the housing 1 is defined as the inside, and the direction toward the outside of the housing 1 is defined as the outside.
The housing 1 includes a first housing 11 and a second housing 12 disposed in order from top to bottom and connected to each other, the first housing 11 having a first chamber 110, a sidewall of the first housing 11 including a first sidewall 111, a second sidewall 112, a third sidewall 113, a fourth sidewall 114, a fifth sidewall 115, and a sixth sidewall 116 enclosing the first chamber 110, wherein the first sidewall 111 and the fourth sidewall 114 extend in a left-right direction, the second sidewall 112 and the sixth sidewall 113 extend in a front-rear direction and are spaced apart from each other in the left-right direction, a length of the fourth sidewall 114 in the left-right direction is smaller than a distance between the second sidewall 112 and the sixth sidewall 113, and an included angle between each of the third sidewall 113 and the fifth sidewall 115 and the fourth sidewall 114 is 135 °.
The inner surfaces of the first side wall 111 include a first inner surface and a second inner surface, each of which is inclined 45 ° from inside to outside in a top-down direction, and the first inner surface and the second inner surface are spaced apart from each other, the first inner surface is located inside the second inner surface, the inner surfaces of the second side wall 112, the third side wall 113, the fourth side wall 114, the fifth side wall 115 and the sixth side wall 116 are flat in the top-bottom direction, wherein the first inner surface of the first side wall 111 is provided with the first reflecting surface 5, the second inner surface of the first side wall 111 is provided with the fourth reflecting surface 8, the inner surface of the third side wall 113 is provided with the second reflecting surface 6, and the inner surface of the fifth side wall 115 is provided with the third reflecting surface 7. Wherein the first reflecting surface 5, the second reflecting surface 6, the third reflecting surface 7 and the fourth reflecting surface 8 are formed by polishing the inner surface of the side wall of the first shell 11 and then plating a gold film.
The second housing 12 has a second chamber 120, the second housing 12 is provided with a first passage 121 and a second passage 122 spaced apart from each other, the axial directions of the first passage 121 and the second passage 122 are parallel, and the first passage 121 and the second passage 122 each extend downward from an upper surface of a top wall of the second housing 12 and extend to a bottom of the second housing 12. The second housing 12 is provided with a through hole 4 for the gas to be measured to enter, and the through hole 4 includes a first through hole 41 communicating with the second chamber 120 and a second through hole 42 communicating the second chamber 120 and the first chamber 110. The side walls of the second housing 12 include a second left side wall 123 and a second right side wall 124 spaced apart from each other in the left-right direction, the first through holes 41 are provided on the second left side wall 123 and the second right side wall 124, and the second left side wall 123 and the second right side wall 124 are each provided with a plurality of first through holes 41, and the second through holes 42 are provided on the top wall of the second housing 12 to communicate the second chamber 120 and the first chamber 110. The second chamber 120 is provided with a partition board, the partition board divides the second chamber 120 into a second left chamber and a second right chamber, the first through hole 41 on the second left side wall 123 is communicated with the second left chamber, and the first through hole 41 on the second right side wall 124 is communicated with the second right chamber.
It can be appreciated that the through hole 4 is formed in the second housing 12 so that gas enters the first chamber 110 of the first housing 11 through the second chamber 120 of the second housing 12, and the first housing 11 is not provided with a through hole communicated with the first chamber 110, so that leakage of infrared light in a transmission process can be reduced, light source utilization rate and acceptance rate of the infrared detector can be improved, and detection efficiency can be improved.
The bottom of second casing 12 is uncovered to be set up and circuit board 9 establishes in the bottom of second casing 12, and infrared light source 2 and infrared detector 3 all establish the upper surface at circuit board 9, and infrared light source 2 is located the bottom in first passageway 121, and infrared detector 3 is located the bottom in second passageway 122. The circuit board 9 is provided with a signal processing circuit which can obtain real-time data values of the infrared detector 3 and filter, amplify, temperature compensate and digital-to-analog convert voltage signals generated by the infrared detector 3. The signal processing circuit can also modulate the infrared light source 2 in a pulse mode to enable the infrared light source 2 to periodically emit light.
The reflector cup 10 is nested at the bottom end in the first channel 121 and is abutted against the inner surface of the first channel 121, the infrared light source 3 is arranged in the reflector cup 10, the reflector cup 10 comprises a cylindrical section 101 and a parabolic section 102, the parabolic section 102 is connected with the upper end of the cylindrical section 101, and the inner diameter of the cylindrical section 101 is kept unchanged along the axial direction of the first channel 121. The first channel 121 comprises a first segment 1211, a second segment 1212 and a third segment 1213 connected in sequence from bottom to top, wherein the outer circumferential contour of the cylindrical segment 101 is adapted to the inner circumferential contour of the first segment 1211, the inner circumferential contour of the parabolic segment 102 is adapted to the inner circumferential contour of the second segment 1212, and the inner diameter of the third segment 1213 remains unchanged along the axial direction of the first channel 121.
The transmission path of the infrared light is that the infrared light of the infrared light source 2 is transmitted to the first reflecting surface 5 along the first channel 121 and is reflected to the second reflecting surface 6 through the first reflecting surface 5, the infrared light incident to the second reflecting surface 6 is reflected to the third reflecting surface 7 through the second reflecting surface 6, the infrared light incident to the third reflecting surface 7 is reflected to the fourth reflecting surface 8 through the third reflecting surface 7, the infrared light incident to the fourth reflecting surface 8 is reflected by the fourth reflecting surface 8 and is transmitted to the infrared detector 3 along the second channel 122, wherein the transmission of the infrared light in the first channel 121 and the second channel 122 is in a vertical plane where the vertical direction and the horizontal direction are located, the transmission of the infrared light reflected by the first reflecting surface 5, the second reflecting surface 6, the third reflecting surface 7 and the fourth reflecting surface 8 is in a horizontal plane where the front-back direction and the horizontal direction are located, that is, the infrared light is transmitted in the vertical plane and the horizontal plane in the infrared gas sensor, the space of the infrared gas sensor is fully utilized, the light can be transmitted in a small optical path in the light path, and the volume of the infrared gas sensor can be reduced.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. An infrared gas sensor, comprising:
The shell comprises a first shell and a second shell, wherein the first shell is provided with a first cavity, the second shell is provided with a second cavity, the second shell is provided with a first channel and a second channel which are arranged at intervals, the first channel and the second channel are communicated with the first cavity, the second shell is provided with a first through hole communicated with the second cavity, and the second shell is provided with a second through hole communicated with the first cavity and the second cavity;
The second shell comprises a second top wall, a second left side wall and a second right side wall opposite to the second left side wall, a plurality of first through holes and a plurality of second through holes are formed in the second left side wall and the second right side wall, the second through holes are formed in the second top wall, the second left side wall and the second right side wall are provided with bottom surfaces facing the circuit board, and the first through holes are a certain distance from the bottom surfaces;
the infrared light source is arranged in the first channel;
and the infrared detector is arranged in the second channel.
2. The infrared gas sensor of claim 1, wherein the second top wall has a top surface, and wherein a portion of the plurality of first through holes are spaced from the bottom surface more than they are spaced from the top surface.
3. The infrared gas sensor of claim 1, wherein the top of the first housing is above the second housing, and the first through hole does not extend through the bottom surface.
4. The infrared gas sensor of claim 1, wherein a portion of the first plurality of through holes is located above half the height of the second left side wall in a height direction.
5. The infrared gas sensor of claim 1, wherein a portion of the first plurality of through holes is located above half the height of the second right side wall in a height direction.
6. The infrared gas sensor according to claim 4 or 5, wherein the plurality of first through holes are arranged in a front-rear direction, the infrared light source extends in a top-bottom direction, and the front-rear direction is perpendicular to the top-bottom direction.
7. The infrared gas sensor of claim 6, wherein the second left side wall and the second right side wall are located on opposite sides of the second top wall in a left-right direction, the left-right direction being perpendicular to the up-down direction and the front-back direction.
8. The infrared gas sensor of claim 7, wherein the first through hole extends in a left-right direction.
9. The infrared gas sensor of claim 7, wherein the second through hole extends in an up-down direction.
10. The infrared gas sensor of claim 3, wherein a partition is disposed in the second chamber, the partition dividing the second chamber into a second left chamber and a second right chamber, the first through hole on the second left side wall being in communication with the second left chamber, the first through hole on the second right side wall being in communication with the second right chamber;
The second shell is arranged at the bottom of the first shell, and the first channel and the second channel extend downwards from the upper surface of the second top wall and extend to the bottom of the second shell;
The infrared gas sensor further comprises a circuit board, the circuit board is arranged at the bottom of the second shell, and the infrared light source and the infrared detector are both arranged on the upper surface of the circuit board;
the first and second channels are axially parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111655582.3A CN114324227B (en) | 2018-06-26 | 2018-06-26 | Infrared gas sensor |
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| CN202111655582.3A CN114324227B (en) | 2018-06-26 | 2018-06-26 | Infrared gas sensor |
| CN201810670537.7A CN110646365B (en) | 2018-06-26 | 2018-06-26 | Infrared gas sensor |
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| CN201810670537.7A Division CN110646365B (en) | 2018-06-26 | 2018-06-26 | Infrared gas sensor |
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| CN202111655582.3A Active CN114324227B (en) | 2018-06-26 | 2018-06-26 | Infrared gas sensor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114324227A (en) | 2022-04-12 |
| CN110646365B (en) | 2021-11-26 |
| CN110646365A (en) | 2020-01-03 |
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