Gas sensor apparatus

Abstract

A gas sensor apparatus, comprising an emitting light source (1), a first photosensitive sensor (31) and a second photosensitive sensor (32), wherein the first photosensitive sensor (31) is arranged below and / or above a light path (AA') where light emitted by the emitting light source (1) is located; the second photosensitive sensor (32) is arranged on the side of the first photosensitive sensor (31) that is close to the emitting light source (1); the first photosensitive sensor (31) comprises a rear end (311) that is close to the emitting light source (1) and a front end (312) that is away from the emitting light source (1); a frontmost end (321) of the second photosensitive sensor (32) does not extend beyond the rear end (311) of the first photosensitive sensor (31), and a plane where the second photosensitive sensor (32) is located intersects a plane where the first photosensitive sensor (31) is located; light emitted by the emitting light source (1) irradiates a gas to be subjected to detection, and particles in said gas undergo scattering to generate scattered light; and the first photosensitive sensor (31) is used to receive scattered light below and / or above the particles, and the second photosensitive sensor (32) is used to receive scattered light on the sides of the particles that are close to the emitting light source (1), so as to detect the particles in said gas.

Description

Gas sensor device Technical Field

[0001] The present invention relates to the technical field of particle detection, and in particular to a gas sensor device. Background Art

[0002] Currently, conventional gas sensors of the same model can only detect the concentration of a single gas component. There are also methods that combine multiple sensors of different types within a single housing to detect multiple gas components. However, existing air quality sensors that can output concentration data for multiple gas components are large and require multiple light sources and multi-channel probes, making them expensive. Furthermore, conventional gas sensors have fixed detection cavities, making them unable to detect multiple gases within the same cavity. Furthermore, conventional particulate matter sensors currently have a minimum detection diameter of 300nm, making them unable to accurately detect particles below 300nm in the gas.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide a gas sensor device to solve the above problems in the prior art.

[0005] In order to solve the above problem, according to a first aspect of the present invention, a gas sensor device is provided, the gas sensor device comprising a light source, a first photosensor, and a second photosensor.

[0006] The first photosensor is arranged below and / or above the optical path of the light emitted by the emitting light source, and the second photosensor is arranged on a side of the first photosensor close to the emitting light source, wherein

[0007] The first photosensor includes a rear end close to the emitting light source and a front end away from the emitting light source, the front end of the second photosensor does not exceed the rear end of the first photosensor, and the plane where the second photosensor is located intersects with the plane where the first photosensor is located; and

[0008] The light emitted by the emitting light source illuminates the gas to be measured, and the particles in the gas to be measured are scattered to produce scattered light. The first photosensor is used to receive the scattered light below and / or above the particles, and the second photosensor is used to receive the scattered light on the side of the particles close to the emitting light source, so as to detect the particles in the gas to be measured.

[0009] Optionally, the center of the second photosensor is at the same height as the center of the light emitted by the emitting light source.

[0010] Optionally, the plane where the first photosensor is located is parallel to the light emitted by the emitting light source, and the plane where the first photosensor is located is perpendicular to the plane where the second photosensor is located.

[0011] Optionally, the gas sensor device also includes a detection chamber equipped with the first photosensor and detecting the gas to be measured, a rear side scattered light detection chamber equipped with the second photosensor, and an extinction chamber, wherein the light emitted by the emitting light source enters the detection chamber, the particulate matter in the gas to be measured generates scattered light, the scattered light from the side of the particulate matter close to the emitting light source enters the rear side scattered light detection chamber, and the remaining light after the light irradiates the gas to be measured enters the extinction chamber.

[0012] Optionally, the gas sensor device also includes a detection chamber for detecting the gas to be tested, the first photosensor is arranged at the bottom and / or top of the detection chamber, the detection chamber includes a first side wall provided with a light inlet of the detection chamber and a second side wall provided with a light outlet of the detection chamber, and the light emitted by the emitting light source enters the detection chamber from the light inlet of the detection chamber and then leaves from the light outlet of the detection chamber.

[0013] Optionally, the first side wall is an arc-shaped structure and the arc-shaped structure protrudes outside the detection chamber. The detection chamber also includes a scattered light inlet, which is arranged on the first side wall of the arc-shaped structure. The second photosensor receives scattered light generated by the particulate matter in the gas to be tested through the scattered light inlet.

[0014] Optionally, the gas sensor device further comprises a light screening unit, the light screening unit comprising at least two light screening chambers and a connecting hole connecting adjacent light screening chambers, the light emitted by the emission light source sequentially passes through the light screening chambers and the connecting holes for light screening, wherein

[0015] The communicating hole includes a second inclined sidewall, and the second inclined sidewall gradually inclines toward the optical path along the transmission direction of the light.

[0016] Optionally, the light screening chamber includes a first inclined side wall, and the first inclined side wall gradually inclines toward the light path along the transmission direction of the light, with a plane perpendicular to the light as a reference plane, and an angle between the second inclined side wall and the reference plane is smaller than an angle between the first inclined side wall and the reference plane.

[0017] Optionally, at least a portion of the side wall of the communicating hole is the second inclined side wall, and the second inclined side wall is disposed adjacent to the upstream light screening chamber.

[0018] Optionally, the light screening unit is in a conical shape, and a large end of the light screening unit is connected to the emitting light source;

[0019] Along the transmission direction of light, the cross-sectional area of ​​each light screening chamber gradually decreases, and the bottom cross-sectional area of ​​the downstream light screening chamber is smaller than the top cross-sectional area of ​​the adjacent upstream light screening chamber.

[0020] Optionally, the light screening chamber includes a front reflector and a rear reflector connected to the first inclined side wall, a connecting hole light inlet is provided in the middle of the front reflector and a connecting hole light outlet is provided in the middle of the rear reflector, wherein

[0021] The area of ​​the front reflector of each light screening chamber is smaller than the area of ​​the rear reflector, and

[0022] The area of ​​the rear reflection plate of the light screening chamber located downstream on the optical path is smaller than the area of ​​the front reflection plate of the light screening chamber located upstream on the optical path.

[0023] Optionally, the light screening unit further comprises an extension channel, one end of the extension channel is connected to the most downstream light screening chamber in the light screening unit, and the other end is connected to the gas to be measured;

[0024] Optionally, the length of the extension channel is 2.5-4.5 mm.

[0025] Optionally, the gas sensor device further includes an extinction chamber, wherein the remaining light after the light irradiates the gas to be measured enters the extinction chamber, the extinction chamber includes a first extinction plate, and the first extinction plate is configured to reflect the remaining light entering the extinction chamber, and an angle α is formed between the first extinction plate and an incident direction of the remaining light entering the extinction chamber, wherein 0<α<90°;

[0026] Optionally, α=45°.

[0027] Optionally, the extinction chamber further includes a second extinction plate, the first extinction plate reflects the remaining light entering the extinction chamber to form a primary reflected light, and the second extinction plate is configured to further reflect the primary reflected light, wherein the reflecting surface of the second extinction plate is a serrated surface, the serrated surface includes a plurality of serrations, and the serrations are inclined toward the top of the extinction chamber, and the serrated surface of the second extinction plate reflects the primary reflected light to the top of the extinction chamber.

[0028] Optionally, the extinction chamber includes an extinction chamber light entry channel, one end of the extinction chamber light entry channel is arranged at the bottom of the extinction chamber, and the other end of the extinction chamber light entry channel extends into the cavity of the extinction chamber and is provided with an extinction chamber light inlet;

[0029] Optionally, the length of the light entry channel of the extinction chamber is 3-5 mm.

[0030] Optionally, a cross section of the light entry channel of the extinction chamber gradually decreases from a direction in which the remaining light enters to a direction in which the remaining light exits.

[0031] Optionally, the gas sensor device further includes a gas inlet channel and a gas outlet channel connected to the detection chamber fluid, and the gas inlet channel and the gas outlet channel are both provided with at least one bending portion so that the gas to be measured changes direction at least once when passing through the gas inlet channel before entering the detection chamber, and the gas to be measured changes direction at least once when passing through the gas outlet channel before leaving the gas sensor device.

[0032] Optionally, a protrusion is provided on the bottom of the gas inlet channel near the detection chamber.

[0033] Optionally, the distance between the center of the protrusion and the detection chamber is 9-19 mm.

[0034] Optionally, the gas sensor device further includes a fan, which is disposed at the entrance of the gas inlet channel and is used to introduce the gas to be measured into the gas inlet channel.

[0035] Optionally, the power of the emitting light source is 80-300 milliwatts, and the wavelength of the light emitted by the emitting light source is 400 nm-700 nm.

[0036] Optionally, the gas sensor device further includes an input and output terminal, wherein the input and output terminal is electrically connected to a charging power source and / or is communicatively connected to a communication device and is used to output measurement results.

[0037] Optionally, a convex lens is further provided in front of the second photosensor;

[0038] Optionally, the convex lens is arranged at the entrance of the scattered light.

[0039] According to a second aspect of the present invention, a light screening unit is provided, which is used to screen the light emitted by the emitting light source to obtain light with an emission angle within a certain range. The light screening unit includes at least two light screening chambers and a connecting hole connecting adjacent light screening chambers. The light emitted by the emitting light source passes through the light screening chambers and the connecting holes in sequence for screening.

[0040] The communicating hole includes a second inclined sidewall, and the second inclined sidewall gradually inclines toward the optical path along the transmission direction of the light.

[0041] Optionally, the light screening chamber includes a first inclined side wall, and the first inclined side wall gradually inclines toward the light path along the transmission direction of the light, with a plane perpendicular to the light as a reference plane, and an angle between the second inclined side wall and the reference plane is smaller than an angle between the first inclined side wall and the reference plane.

[0042] Optionally, at least a portion of the side wall of the communicating hole is the second inclined side wall, and the second inclined side wall is disposed adjacent to the upstream light screening chamber.

[0043] Optionally, the light screening unit is in a conical shape, and a large end of the light screening unit is connected to the emitting light source;

[0044] Along the transmission direction of light, the cross-sectional area of ​​each light screening chamber gradually decreases, and the bottom cross-sectional area of ​​the downstream light screening chamber is smaller than the top cross-sectional area of ​​the adjacent upstream light screening chamber.

[0045] Optionally, the light screening chamber includes a front reflector and a rear reflector connected to the first inclined side wall, a connecting hole light inlet is provided in the middle of the front reflector and a connecting hole light outlet is provided in the middle of the rear reflector, wherein

[0046] The area of ​​the front reflector of each light screening chamber is smaller than the area of ​​the rear reflector, and

[0047] The area of ​​the rear reflection plate of the light screening chamber located downstream on the optical path is smaller than the area of ​​the front reflection plate of the light screening chamber located upstream on the optical path.

[0048] Optionally, the light screening unit further includes an extension channel, one end of which is connected to the most downstream light screening chamber in the light screening unit, and the other end of which is connected to the gas to be measured.

[0049] Optionally, the length of the extension channel is 2.5-4.5 mm.

[0050] According to a third aspect of the present invention, a gas sensor device is provided, characterized in that the gas sensor device comprises any one of the above-mentioned light screening units.

[0051] According to a fourth aspect of the present invention, a gas sensor device is provided, comprising a light source, a photosensor, and an extinction chamber. Light emitted by the light source irradiates particles in a gas to be measured, causing them to scatter and generate scattered light. The photosensor receives the scattered light to detect particles in the gas to be measured. After the light irradiates the gas to be measured, the remaining light enters the extinction chamber.

[0052] The extinction chamber includes a first extinction plate, which is configured to reflect the remaining light entering the extinction chamber. The angle between the first extinction plate and the incident direction of the remaining light entering the extinction chamber is α, wherein 0<α<90°.

[0053] Optionally, α=45°.

[0054] Optionally, the extinction chamber further includes a second extinction plate, the first extinction plate reflects the remaining light entering the extinction chamber to form a primary reflected light, and the second extinction plate is configured to further reflect the primary reflected light, wherein the reflecting surface of the second extinction plate is an inclined serrated surface, the serrated surface includes a plurality of serrations, and the serrations are inclined toward the top of the extinction chamber, and the serrated surface of the second extinction plate reflects the primary reflected light to the top of the extinction chamber.

[0055] Optionally, the extinction chamber includes an extinction chamber light entrance channel, one end of which is arranged at the bottom of the extinction chamber, and the other end of which extends into the cavity of the extinction chamber and is provided with an extinction chamber light inlet.

[0056] Optionally, the length of the light entry channel of the extinction chamber is 3-5 mm.

[0057] Optionally, a cross section of the light entry channel of the extinction chamber gradually decreases from a direction in which the remaining light enters to a direction in which the remaining light exits.

[0058] Optionally, the gas sensor device further includes a detection chamber and a light screening unit, and the light emitted by the emission light source passes through the light screening unit, the detection chamber and the extinction chamber in sequence.

[0059] The light screening unit includes at least two light screening chambers and a connecting hole connecting adjacent light screening chambers. The light emitted by the emission light source passes through the light screening chambers and the connecting holes in sequence for light screening.

[0060] The communicating hole includes a second inclined sidewall, and the second inclined sidewall gradually inclines toward the optical path along the transmission direction of the light.

[0061] Optionally, the light screening chamber includes a first inclined side wall, and the first inclined side wall gradually inclines toward the light path along the transmission direction of the light, with a plane perpendicular to the light as a reference plane, and an angle between the second inclined side wall and the reference plane is smaller than an angle between the first inclined side wall and the reference plane.

[0062] Optionally, at least a portion of the side wall of the communicating hole is the second inclined side wall, and the second inclined side wall is disposed adjacent to the upstream light screening chamber.

[0063] Optionally, the light screening unit is in a conical shape, and a large end of the light screening unit is connected to the emitting light source;

[0064] Along the transmission direction of light, the cross-sectional area of ​​each light screening chamber gradually decreases, and the bottom cross-sectional area of ​​the downstream light screening chamber is smaller than the top cross-sectional area of ​​the adjacent upstream light screening chamber.

[0065] Optionally, the light screening chamber includes a front reflector and a rear reflector connected to the first inclined side wall, a connecting hole light inlet is provided in the middle of the front reflector and a connecting hole light outlet is provided in the middle of the rear reflector, wherein

[0066] The area of ​​the front reflector of each light screening chamber is smaller than the area of ​​the rear reflector, and

[0067] The area of ​​the rear reflection plate of the light screening chamber located downstream on the optical path is smaller than the area of ​​the front reflection plate of the light screening chamber located upstream on the optical path.

[0068] Optionally, the light screening unit further comprises an extension channel, one end of the extension channel is connected to the most downstream light screening chamber in the light screening unit, and the other end is connected to the gas to be measured;

[0069] Optionally, the length of the extension channel is 2.5-4.5 mm.

[0070] A fifth aspect of the present invention provides an extinction chamber, which is arranged in a gas sensor device. The gas sensor device includes a light source and a photosensor. The light emitted by the light source irradiates particulate matter in the gas to be measured, causing scattering to generate scattered light. The photosensor is used to receive the scattered light to detect particulate matter in the gas to be measured. After the light irradiates the gas to be measured, the remaining light enters the extinction chamber.

[0071] The extinction chamber includes a first extinction plate, which is configured to reflect the remaining light entering the extinction chamber, and an angle α is formed between the first extinction plate and an incident direction of the remaining light entering the extinction chamber, wherein 0<α<90°;

[0072] Optionally, α=45°.

[0073] Optionally, the extinction chamber further includes a second extinction plate, the first extinction plate reflects the remaining light entering the extinction chamber to form a primary reflected light, and the second extinction plate is configured to further reflect the primary reflected light, wherein the reflecting surface of the second extinction plate is an inclined serrated surface, the serrated surface includes a plurality of serrations, and the serrations are inclined toward the top of the extinction chamber, and the serrated surface of the second extinction plate reflects the primary reflected light to the top of the extinction chamber.

[0074] Optionally, the extinction chamber includes an extinction chamber light entrance channel, one end of which is arranged at the bottom of the extinction chamber, and the other end of which extends into the cavity of the extinction chamber and is provided with an extinction chamber light inlet.

[0075] Optionally, the length of the light entry channel of the extinction chamber is 3-5 mm.

[0076] Optionally, a cross section of the light entry channel of the extinction chamber gradually decreases from a direction in which the remaining light enters to a direction in which the remaining light exits.

[0077] The beneficial effects of the present invention are as follows: the sensor device of the present invention can be used to detect particulate matter in the gas. It can not only detect large particulate matter, but also effectively measure and count particulate matter with a diameter of less than 300nm, especially accurately qualitatively measure particulate matter with a diameter of 100-300nm. In addition, the sensor device provided by the present invention is provided with photosensitive sensors in multiple dimensions, so that the geometric dimensions of the particulate matter can be seen from multiple directions, and various characteristics of the particulate matter (appearance characteristics, reflectivity) can be obtained, thereby judging the type of particulate matter (including but not limited to shape and reflectivity), thereby improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] FIG1 is a top view of the internal structure of a gas sensor device according to an embodiment of the present invention;

[0079] FIG2 is a perspective view of the gas sensor device of FIG1 ;

[0080] FIG3 is an enlarged top view of the light screening unit in FIG1 ;

[0081] FIG. 4 is an enlarged perspective view of the extinction chamber in FIG. 1 . DETAILED DESCRIPTION

[0082] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0083] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0084] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0085] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0086] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0087] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0088] A first embodiment of the present invention provides a gas sensor device. Referring to Figures 1 and 2, the gas sensor device includes an emitting light source 1, a first photosensor 31, and a second photosensor 32. The first photosensor 31 is arranged below and / or above the optical path of light emitted by the emitting light source 1, and the second photosensor 32 is arranged on a side of the first photosensor 31 close to the emitting light source 1. The first photosensor 31 includes a rear end 311 close to the emitting light source 1 and a front end 312 away from the emitting light source 1. The front end 321 of the second photosensor 32 does not exceed the rear end 311 of the first photosensor 31, and the plane on which the second photosensor 32 is located intersects with the plane on which the first photosensor 31 is located. In addition, the light emitted by the emitting light source 1 irradiates a gas to be measured, and particulate matter in the gas to be measured is scattered to generate scattered light. The first photosensor 31 is used to receive the scattered light below and / or above the particulate matter, and the second photosensor 32 is used to receive the scattered light from the side of the particulate matter close to the emitting light source 1, so as to detect the particulate matter in the gas to be measured.

[0089] It should be noted that:

[0090] 1. The first photosensor is arranged below and / or above the optical path of the light emitted by the emitting light source. It can be understood that the first photosensor can be arranged below the optical path of the light emitted by the emitting light source (Figure 1), the first photosensor can be arranged above the optical path of the light emitted by the emitting light source, and the two first photosensors can be respectively arranged above and below the optical path of the light emitted by the emitting light source.

[0091] 2. The plane where the second photosensor shown in Figure 1 is located is perpendicular to the plane where the first photosensor is located, that is, the angle between the two planes is 90°. Those skilled in the art can understand that the intersection of two planes means that the angle between the two planes is greater than 0° and less than or equal to 90°.

[0092] 3. The present invention detects particulate matter in the gas to be tested, including detecting the number, size, concentration, etc. of the particulate matter.

[0093] 4. The distance between the front end of the second photosensor and the rear end of the first photosensor is greater than or equal to 0.

[0094] According to Mie scattering, scattering occurs when the diameter of particles in the atmosphere is comparable to the wavelength of radiation. The principle of Mie scattering is as follows:

[0095] Where α is the dimensionless particle size parameter, m1 is the refractive index of the dispersion medium surrounding the particle, d is the particle diameter, f is the frequency of light, and c is the speed of light.

[0096] From the above formula, it can be concluded that the change in the degree of scattering is a function proportional to the particle size (d) and the wavelength of the light source (λ=1 / f), that is, α=π*d*f=2πr / λ.

[0097] When α<0.1, it can be regarded as Rayleigh scattering analysis;

[0098] When α ≥ 0.1, it can be regarded as Mie scattering analysis;

[0099] When α>50, geometric optics analysis can be used;

[0100] From this figure, we can see that when α is in the Mie scattering range, the larger α and the larger the particle size, the stronger the scattering in the forward direction of the light than in the backward direction.

[0101] We can also see that when α < 1 and α > 0.1, the smaller α is, the greater the growth trend of light scattering in the backward direction than in the forward direction. Therefore, by increasing the intensity detection of backscattered light and analyzing the intensity changes of backscattered light and traditional 90-degree scattered light, we can achieve more accurate identification of particles between 100-300nm.

[0102] In addition, the limit of α in Mie scattering is 0.1-0.3. Taking the wavelength of the light source we are currently using as 650nm as an example, the minimum particle size that can be detected is 65nm-195nm.

[0103] Therefore, through the design of "the first photosensor is arranged below and / or above the optical path of the light emitted by the emitting light source, and the second photosensor is arranged on the side of the first photosensor close to the emitting light source, wherein the front end of the second photosensor does not exceed the rear end of the first photosensor, and the plane where the second photosensor is located intersects with the plane where the first photosensor is located", the sensor device of the present invention can be used to detect particulate matter in the gas. It can not only detect large particles, but also effectively measure and count particles with a diameter of less than 300nm, especially accurately qualitatively measure particles with a diameter of 100-300nm, while the particle detection in the prior art detects particles larger than 300nm.

[0104] Moreover, the sensor device provided by the present invention is equipped with photosensors in multiple dimensions, so that the geometric dimensions of the particles can be seen from multiple directions, and multiple characteristics of the particles (appearance characteristics, reflectivity) can be obtained, thereby determining the type of particles (including but not limited to shape and reflectivity) and improving detection accuracy.

[0105] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , the center of the second photosensor 32 is at the same height as the center of the light emitted by the light source 1 .

[0106] Through such a design, not only can the distance between the second photosensor and the particles emitting scattered light be minimized, but when the distance is minimized, the intensity of the detected scattered light will be stronger, thereby making the detection data more accurate, making the subsequent algorithm simpler, and more convenient to generate and process.

[0107] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , the plane where the first photosensor 31 is located is parallel to the light emitted by the emitting light source 1 , and the plane where the first photosensor 31 is located is perpendicular to the plane where the second photosensor 32 is located.

[0108] Through such a design, the detection data is made more accurate, the subsequent algorithm is made simpler, and it is more convenient to generate and process.

[0109] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , the optical path of the light emitted by the light source 1 is located directly above the center line of the first photosensor 31 .

[0110] In one embodiment of the present invention, referring to Figures 1 and 2, the gas sensor device also includes a detection chamber 3 provided with a first photosensor 31 and detecting the gas to be measured, a rear side scattered light detection chamber 6 provided with a second photosensor 32, and an extinction chamber 4. The light emitted by the light source 1 enters the detection chamber 3, and the particulate matter in the gas to be measured generates scattered light. The scattered light on the side of the particulate matter close to the light source 1 enters the rear side scattered light detection chamber 6, and the remaining light after the light irradiates the gas to be measured enters the extinction chamber 4.

[0111] In one embodiment of the present invention, referring to Figures 1 and 2, the gas sensor device also includes a detection chamber 3 for detecting the gas to be tested, a first photosensor 31 is arranged at the bottom and / or top of the detection chamber 1, and the detection chamber 1 includes a first side wall 34 provided with a detection chamber light inlet 33 and a second side wall 36 provided with a detection chamber light outlet 35. The light emitted by the light source 1 enters the detection chamber 3 from the detection chamber light inlet 33 and then leaves the detection chamber 3 from the detection chamber light outlet 35.

[0112] In one embodiment of the present invention, referring to Figures 1 and 2, the first side wall 34 is an arc-shaped structure and the arc-shaped structure protrudes outward from the detection chamber 3. The detection chamber 3 also includes a scattered light inlet 37, which is arranged on the first side wall 34 of the arc-shaped structure. The second photosensor 32 receives scattered light generated by particulate matter in the gas to be tested through the scattered light inlet 37.

[0113] Through such a design, when the first side wall is an arc-shaped structure, a straight hole scattered light inlet can be opened, which is easy to demold during production and processing. When the first side wall is a flat structure, in order to allow the second photosensor to receive scattered light generated by particulate matter, the scattered light inlet is an inclined hole, which will cause difficulty in demolding during production and processing and is not easy to produce and process.

[0114] Specifically, the center of the light inlet of the detection chamber is at the same height as the center of the second photosensor.

[0115] In one embodiment of the present invention, the gas sensor device also includes a light screening unit, which is used to calibrate and straighten the light emitted by the emitting light source 1, and the light screening unit is used to screen the light emitted by the emitting light source to obtain light with an emission angle within a certain range. The light screening unit includes at least two light screening chambers and connecting holes connecting adjacent light screening chambers. The light emitted by the emitting light source repeatedly passes through the light screening chambers and the connecting holes in sequence for screening, as shown in Figures 1 and 3. In this embodiment, the light screening unit 2 includes four light screening chambers, namely the first light screening chamber 21, the second light screening chamber 22, the third light screening chamber 23, and the fourth light screening chamber 24, as well as a first connecting hole 25 connecting the first light screening chamber 21 and the second light screening chamber 22, the second connecting hole 26 connecting the second light screening chamber 22 and the third light screening chamber 23, and the third connecting hole 27 connecting the third light screening chamber 23 and the fourth light screening chamber 24. The following is an explanation taking the first light screening chamber 21 and the first connecting hole 25 as an example. The second light screening chamber 22 and the second connecting hole 26, and the third light screening chamber 23 and the third connecting hole 27 have the same structure: the first light screening chamber 21 includes a first inclined side wall 211, and the first inclined side wall 211 gradually inclines toward the light path along the transmission direction of the light emitted by the emitting light source 1. In Figure 3, AA' is the light path, and the arrow indicates the transmission direction of the light. The first connecting hole 25 includes a second inclined side wall 251, and the second inclined side wall 251 gradually inclines toward the light path along the transmission direction of the light.

[0116] By designing the second inclined side wall, emitted light with a certain inclination angle can be reflected by the second inclined side wall of the communicating hole, thereby obtaining relatively parallel light (light with an emission angle within a certain range) entering the detection chamber.

[0117] Taking the plane perpendicular to the light as a reference plane, the angle α between the second inclined sidewall 251 and the reference plane is smaller than the angle β between the first inclined sidewall 211 and the reference plane.

[0118] Through such a design, the emission light with a larger inclination angle is irradiated to the first inclined side wall of the screening chamber and reflected in the screening chamber, thereby screening out the emission light with a larger inclination angle; the emission light with a smaller inclination angle is irradiated to the second inclined side wall of the connecting hole and reflected, thereby screening out the emission light with a smaller inclination angle; after the above-mentioned multiple screenings, relatively parallel light (light with an emission angle within a certain range) is obtained and enters the detection chamber.

[0119] In the embodiment, the light screening unit 2 is conical in shape, the large end of the light screening unit 2 is connected to the emitting light source 1, and the small end of the light screening unit is connected to the detection chamber 3; along the light transmission direction, the cross-sectional area of ​​each light screening chamber gradually decreases, and the bottom cross-sectional area of ​​the downstream light screening chamber is smaller than the top cross-sectional area of ​​the adjacent upstream light screening chamber. For example, along the light transmission direction, the cross-sectional areas of the first light screening chamber 21, the second light screening chamber 22, the third light screening chamber 23, and the fourth light screening chamber 24 gradually decrease, and the cross-sectional area of ​​the bottom 224 of the second light screening chamber 22 located downstream is smaller than the cross-sectional area of ​​the top 212 of the first light screening chamber 21 located upstream, the cross-sectional area of ​​the bottom 234 of the third light screening chamber 23 is smaller than the cross-sectional area of ​​the top 222 of the second light screening chamber 22, and the cross-sectional area of ​​the bottom 244 of the fourth light screening chamber 24 is smaller than the cross-sectional area of ​​the top 232 of the third light screening chamber 23.

[0120] Specifically, in this embodiment, the light screening chamber includes a front reflector and a back reflector connected to the first inclined side wall. A light inlet hole is provided in the middle of the front reflector, and a light outlet hole is provided in the middle of the back reflector. The area of ​​the front reflector in each light screening chamber is smaller than the area of ​​the back reflector, and the area of ​​the back reflector in the light screening chamber located downstream in the optical path is smaller than the area of ​​the front reflector in the light screening chamber located upstream in the optical path. In this embodiment, the first light screening chamber 21 includes a front reflector 212 and a back reflector 214 connected to the first inclined side wall 211. The area of ​​the front reflector 212 is smaller than the area of ​​the back reflector 214. The second light screening chamber 22 includes a front reflector 222 and a back reflector 224 connected to the first inclined side wall 221. The area of ​​the front reflector 222 is smaller than the area of ​​the back reflector 224. Furthermore, the area of ​​the back reflector 224 in the second light screening chamber 22 is smaller than the area of ​​the front reflector 212 in the first light screening chamber 21.

[0121] In this embodiment, at least a portion of the sidewall of the connecting hole is a second inclined sidewall, and the second inclined sidewall is located immediately adjacent to the upstream light screening chamber. In this embodiment, the second inclined sidewall 251 of the connecting hole 25 is located immediately adjacent to the upstream first light screening chamber 21, the second inclined sidewall of the connecting hole 26 is located immediately adjacent to the upstream second light screening chamber 22, and the second inclined sidewall of the connecting hole 27 is located immediately adjacent to the upstream third light screening chamber 23. Specifically, in this embodiment, the connecting hole includes a connecting hole light inlet and a connecting hole light outlet. Light emitted by the emitting light source enters the connecting hole from one light screening chamber through the connecting hole light inlet and then enters the other light screening chamber through the connecting hole light outlet. At least a portion of the sidewall of the connecting hole is a second inclined sidewall, and the second inclined sidewall is located immediately adjacent to the connecting hole light inlet.

[0122] In this embodiment, the screening unit 2 also includes an extension channel 28, one end of the extension channel 28 is connected to the most downstream screening chamber in the screening unit, and the other end is connected to the gas to be measured, that is, one end of the extension channel 28 is connected to the fluid of the fourth screening chamber 24, and the other end is connected to the fluid of the detection chamber 3.

[0123] Through the design of the extended channel, the light coming out of the multiple light screening chambers and the communicating holes can be further calibrated and straightened.

[0124] Preferably, the length of the extension channel 28 is 2.5-4.5 mm.

[0125] In one embodiment of the present invention, the gas sensor device also includes an extinction chamber 4. Referring to Figures 1 and 4, the light emitted by the light source 1 enters the detection chamber 3 through the screening unit 2 to irradiate the particulate matter in the gas to be measured, causing scattering to produce scattered light. The scattered light is received by a photosensor to detect the particulate matter in the gas to be measured. The remaining light after the light irradiates the gas to be measured enters the extinction chamber 4. The extinction chamber 4 extincts the remaining light so that this part of the remaining light no longer returns to the detection chamber 3, which can reduce interference with the detection results in the detection chamber 3, reduce the brightness of the background light in the detection chamber 3, and increase the minimum detection limit, so that the particle size of the detected particulate matter is relatively small (for example, a particle size below 300nm), thereby improving the detection accuracy.

[0126] In this embodiment, the extinction chamber 4 includes a first extinction plate 41, which is configured to reflect the remaining light entering the extinction chamber 4. The first extinction plate 41 forms an angle α with the incident direction of the remaining light entering the extinction chamber 4, where 0 < α < 90°; in this embodiment, α = 45°. In Figure 4, BB represents the incident direction of the remaining light in the detection chamber 3 entering the extinction chamber.

[0127] The extinction chamber 4 also includes a second extinction plate 42. The first extinction plate 41 reflects the remaining light entering the extinction chamber 4 to form a primary reflected light. The second extinction plate 42 is configured to further reflect the primary reflected light, wherein the reflecting surface of the second extinction plate 42 is a serrated surface 421. The serrated surface 421 includes a plurality of serrations, which are inclined toward the top of the extinction chamber 4. The serrated surface 421 reflects the primary reflected light to the top of the extinction chamber 4 for extinction.

[0128] In this embodiment, the serrated surface 421 includes a plurality of V-shaped serrations.

[0129] The extinction chamber 4 includes an extinction chamber light entry channel, one end of which is connected to the detection chamber 3, and the other end extends into the cavity of the extinction chamber 4 and is provided with an extinction chamber light inlet; the length of the extinction chamber light entry channel is 3-5mm.

[0130] In this embodiment, the cross-section of the extinction chamber light entry channel 43 gradually decreases from the direction in which the residual light enters to the direction in which it leaves. The residual light in the detection chamber 3 enters the extinction chamber 4 through the extinction chamber light entry channel 43. This structural design of the extinction chamber light entry channel 43 makes it difficult for the light in the extinction chamber 4 to return to the detection chamber 3 through the extinction chamber light entry channel 43.

[0131] In one embodiment of the present invention, referring to Figures 1 and 2, the gas sensor device also includes a gas inlet channel 51 and a gas outlet channel 52 that are fluidically connected to the detection chamber 3. The gas inlet channel 51 and the gas outlet channel 52 are both provided with at least one bending portion 53, so that the gas to be measured changes direction at least once when passing through the gas inlet channel 51 before entering the detection chamber 3, and the gas to be measured changes direction at least once when passing through the gas outlet channel 52 before leaving the gas sensor device.

[0132] Through such a design, the environment in the detection room can be kept from being affected by the airflow outside the gas sensor device.

[0133] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , a protrusion 54 is provided at the bottom of the gas inlet channel 51 near the detection chamber 3 .

[0134] This design allows the gas under test to flow faster through the raised portion, dispersing any agglomerated particles and improving the accuracy of test data. For example, if a 200nm particle and a 300nm particle agglomerate and are not dispersed, the particle detected in the test chamber may appear to be a 500nm particle, resulting in an error in the test result.

[0135] Specifically, the upper end surface of the protrusion is higher than the bottom of the gas inlet channel, so that the cross section of the gas inlet channel provided with the protrusion is reduced.

[0136] In one embodiment of the present invention, referring to FIG1 and FIG2 , the distance between the midpoint of the protrusion 54 and the detection chamber 3 is 9-19 mm.

[0137] With this design, the distance between the protrusion and the detection chamber cannot be too close or too far. If the distance is too close, the gas to be tested will flow through the detection chamber at a relatively fast speed, affecting the detection accuracy. If the distance is too far, the originally dispersed particles in the gas to be tested will agglomerate again.

[0138] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , the gas sensor device further includes a fan 55 , which is disposed at the entrance of the gas inlet channel 51 and is used to introduce the gas to be measured into the gas inlet channel 51 .

[0139] In one embodiment of the present invention, referring to FIG1 and FIG2 , the power of the emitting light source 1 is 80-300 mW, and the wavelength of the light emitted by the emitting light source 1 is 400 nm-700 nm;

[0140] In one embodiment of the present invention, referring to FIG1 and FIG2 , the gas sensor device further includes an input / output terminal 7 , which is electrically connected to a charging power source and / or is communicatively connected to a communication device and is used to output measurement results.

[0141] Specifically, the communication device may include an external display screen, a display screen provided in the gas sensor device, or the like.

[0142] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , a convex lens is further provided in front of the second photosensor 32 for more effectively receiving scattered light.

[0143] Specifically, a convex lens is disposed at the scattered light inlet 37 to improve sampling efficiency and sampling accuracy, so that the second photosensor receives more backscattered light.

[0144] The second embodiment of the present invention provides a light screening unit, which is used to screen the light emitted by the emitting light source to obtain light with an emission angle within a certain range. For specific features of the light screening unit, please refer to the implementation of the light screening unit in the first embodiment.

[0145] It should be noted that when the emission angle is 0, the light is absolutely parallel.

[0146] A third embodiment of the present invention provides a gas sensor device including the light filtering unit according to the second embodiment.

[0147] In one embodiment of the present invention, referring to Figures 1 and 2, the gas sensor device includes an emitting light source 1, a photosensor and a screening unit 2. The light emitted by the emitting light source 1 is screened by the screening unit 2 and then irradiated on the particulate matter in the gas to be measured to scatter and generate scattered light. The scattered light is received by the photosensor to detect the particulate matter in the gas to be measured.

[0148] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , the photosensor includes a first photosensor 31 and a second photosensor 32 . For a specific embodiment, see the first embodiment.

[0149] In other embodiments, other features of the gas sensor device refer to those of the first embodiment.

[0150] The fourth embodiment of the present invention provides a gas sensor device, which includes an emitting light source 1, a photosensor and an extinction chamber 4. The light emitted by the emitting light source 2 irradiates particulate matter in the gas to be measured, causing scattering to generate scattered light. The scattered light is received by the photosensor to detect the particulate matter in the gas to be measured. After the light irradiates the gas to be measured, the remaining light enters the extinction chamber 4, wherein the extinction chamber 4 includes a first extinction plate, which is configured to reflect the remaining light entering the extinction chamber 4. The angle between the first extinction plate and the incident direction of the remaining light entering the extinction chamber is α, wherein 0<α<90°.

[0151] In other embodiments, for the specific features of the extinction chamber, please refer to the embodiment of the extinction chamber in the first embodiment.

[0152] In one embodiment of the present invention, referring to FIG. 1 and FIG. 2 , the photosensor includes a first photosensor 31 and a second photosensor 32 . For a specific embodiment, see the first embodiment.

[0153] In other embodiments, other features of the gas sensor device refer to those of the first embodiment.

[0154] A fifth embodiment of the present invention provides an extinction chamber. Referring to Figures 1 and 4, the extinction chamber is arranged in a gas sensor device, and the gas sensor device includes a light source and a photosensor. The light emitted by the light source irradiates the particulate matter in the gas to be measured, causing scattering to produce scattered light. The scattered light is received by the photosensor to detect the particulate matter in the gas to be measured. After the light irradiates the gas to be measured, the remaining light enters the extinction chamber, wherein the extinction chamber 4 includes a first extinction plate 41, which is configured to reflect the remaining light entering the extinction chamber 4. The angle between the first extinction plate 41 and the incident direction of the remaining light entering the extinction chamber 4 is α, wherein 0<α<90°.

[0155] In other embodiments, for the specific features of the extinction chamber, please refer to the embodiment of the extinction chamber in the first embodiment.

[0156] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalents also fall within the scope of the claims appended hereto.

Claims

1. A gas sensor device, It is characterized in that The gas sensor device comprises a light source, a first photosensor, and a second photosensor. The first photosensor is arranged below and / or above the optical path of the light emitted by the emitting light source, and the second photosensor is arranged on a side of the first photosensor close to the emitting light source, wherein The first photosensitive sensor includes a rear end close to the emitting light source and a front end away from the emitting light source, the front end of the second photosensitive sensor does not exceed the rear end of the first photosensitive sensor, and the plane where the second photosensitive sensor is located intersects with the plane where the first photosensitive sensor is located, and The light emitted by the emitting light source illuminates the gas to be measured, and the particles in the gas to be measured are scattered to produce scattered light. The first photosensor is used to receive the scattered light below and / or above the particles, and the second photosensor is used to receive the scattered light on the side of the particles close to the emitting light source, so as to detect the particles in the gas to be measured.

2. The gas sensor device according to claim 1, It is characterized in that The center of the second photosensor is at the same height as the center of the light emitted by the emitting light source.

3. The gas sensor device according to claim 1, It is characterized in that The plane where the first photosensor is located is parallel to the light emitted by the emitting light source, and the plane where the first photosensor is located is perpendicular to the plane where the second photosensor is located.

4. The gas sensor device according to claim 1, It is characterized in that The gas sensor device also includes a detection chamber for detecting the gas to be detected, the first photosensor is arranged at the bottom and / or top of the detection chamber, the detection chamber includes a first side wall provided with a light inlet of the detection chamber and a second side wall provided with a light outlet of the detection chamber, and the light emitted by the emitting light source enters the detection chamber from the light inlet of the detection chamber and then leaves from the light outlet of the detection chamber.

5. The gas sensor device according to claim 4, It is characterized in that The first side wall is an arc-shaped structure and the arc-shaped structure protrudes out of the detection chamber. The detection chamber also includes a scattered light inlet, which is arranged on the first side wall of the arc-shaped structure. The second photosensor receives scattered light generated by the particulate matter in the gas to be tested through the scattered light inlet.

6. The gas sensor device according to claim 1, It is characterized in that The gas sensor device further includes a light screening unit, which includes at least two light screening chambers and a connecting hole connecting adjacent light screening chambers, and the light emitted by the emission light source is sequentially screened through the light screening chambers and the connecting holes, wherein The communication hole includes a second inclined side wall, and the second inclined side wall gradually inclines toward the optical path along the transmission direction of the light.

7. The gas sensor device according to claim 6, It is characterized in that The light screening chamber includes a first inclined side wall, and the first inclined side wall gradually inclines toward the light path along the transmission direction of the light, with a plane perpendicular to the light as a reference plane, and an angle between the second inclined side wall and the reference plane is smaller than an angle between the first inclined side wall and the reference plane.

8. The gas sensor device according to claim 6, It is characterized in that At least a portion of the side wall of the communicating hole is the second inclined side wall, and the second inclined side wall is disposed adjacent to the upstream light screening chamber.

9. The gas sensor device according to claim 8, It is characterized in that The light screening unit is in a conical shape, and the large end of the light screening unit is connected to the emitting light source; Along the transmission direction of light, the cross-sectional area of ​​each light screening chamber gradually decreases, and the bottom cross-sectional area of ​​the downstream light screening chamber is smaller than the top cross-sectional area of ​​the adjacent upstream light screening chamber.

10. The gas sensor device according to claim 9, It is characterized in that The light screening chamber comprises a front reflector and a rear reflector connected to the first inclined side wall, a connecting hole light inlet is provided in the middle of the front reflector and a connecting hole light outlet is provided in the middle of the rear reflector, wherein The area of ​​the front reflector of each of the light screening chambers is smaller than the area of ​​the rear reflector, and The area of ​​the rear reflection plate of the light screening chamber located downstream of the optical path is smaller than the area of ​​the front reflection plate of the light screening chamber located upstream of the optical path.

11. The gas sensor device according to claim 6, It is characterized in that The light screening unit further comprises an extension channel, one end of which is connected to the light screening chamber at the most downstream of the light screening unit, and the other end of which is connected to the gas to be tested; Optionally, the length of the extension channel is 2.5-4.5 mm.

12. The gas sensor device according to claim 1, It is characterized in that The gas sensor device further includes an extinction chamber, and the remaining light after the light irradiates the gas to be measured enters the extinction chamber. The extinction chamber includes a first extinction plate, and the first extinction plate is configured to reflect the remaining light entering the extinction chamber. The angle between the first extinction plate and the incident direction of the remaining light entering the extinction chamber is α, wherein 0<α<90°; Optionally, α=45°.

13. The gas sensor device according to claim 12, It is characterized in that The extinction chamber also includes a second extinction plate, the first extinction plate reflects the remaining light entering the extinction chamber to form a primary reflected light, and the second extinction plate is configured to further reflect the primary reflected light, wherein the reflecting surface of the second extinction plate is a serrated surface, the serrated surface includes a plurality of serrations, and the serrations are inclined toward the top direction of the extinction chamber, and the serrated surface of the second extinction plate reflects the primary reflected light to the top of the extinction chamber.

14. The gas sensor device according to claim 12, It is characterized in that The extinction chamber comprises an extinction chamber light entry channel, one end of which is arranged at the bottom of the extinction chamber, and the other end of which extends into the cavity of the extinction chamber and is provided with an extinction chamber light inlet; Optionally, the length of the light entry channel of the extinction chamber is 3-5 mm.

15. The gas sensor device according to claim 14, It is characterized in that The cross section of the light entry channel of the extinction chamber gradually decreases from the direction in which the remaining light enters to the direction in which the remaining light leaves.

16. The gas sensor device according to claim 4, It is characterized in that The gas sensor device also includes a gas inlet channel and a gas outlet channel connected to the detection chamber fluid, and the gas inlet channel and the gas outlet channel are both provided with at least one bending portion, so that the gas to be measured changes direction at least once when passing through the gas inlet channel and then enters the detection chamber, and the gas to be measured changes direction at least once when passing through the gas outlet channel and then leaves the gas sensor device.

17. The gas sensor device according to claim 15, It is characterized in that The gas inlet channel is provided with a protrusion near the bottom of the detection chamber.

18. The gas sensor device according to claim 17, It is characterized in that The distance between the center of the protrusion and the detection chamber is 9-19 mm.

19. The gas sensor device according to claim 1, It is characterized in that The power of the emitting light source is 80-300 milliwatts, and the wavelength of the light emitted by the emitting light source is 400nm-700nm.

20. The gas sensor device according to claim 1, It is characterized in that A convex lens is also provided in front of the second photosensitive sensor; Optionally, the convex lens is arranged at the entrance of the scattered light.

21. The gas sensor device according to claim 1, It is characterized in that The gas sensor device also includes a detection chamber equipped with the first photosensor and used to detect the gas to be detected, a rear side scattered light detection chamber equipped with the second photosensor, and an extinction chamber. The light emitted by the emitting light source enters the detection chamber, and the particles in the gas to be detected generate scattered light. The scattered light on the side of the particles close to the emitting light source enters the rear side scattered light detection chamber, and the remaining light after the light irradiates the gas to be detected enters the extinction chamber.

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