CN110895235A - Binary channels air quality detection module - Google Patents
Binary channels air quality detection module Download PDFInfo
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- CN110895235A CN110895235A CN201911323244.2A CN201911323244A CN110895235A CN 110895235 A CN110895235 A CN 110895235A CN 201911323244 A CN201911323244 A CN 201911323244A CN 110895235 A CN110895235 A CN 110895235A
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 239000000428 dust Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 7
- 230000009977 dual effect Effects 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention relates to a double-channel air quality detection module, which comprises a shell, a first air channel and a second air channel, wherein the first air channel and the second air channel are positioned at two opposite sides of the shell and are separated from each other, the shell is internally provided with a laser module and a spectroscope, the first air duct and the second air duct are respectively internally provided with a first light sensor and a second light sensor, and the shell is provided with a first light outlet hole and a second light outlet hole which are respectively communicated with the first air duct and the second air duct, the light emitted by the laser module is reflected by the spectroscope to be divided into two laser beams, the two laser beams enter the first air duct and the second air duct from the first light outlet hole and the second light outlet hole respectively, and the dust particles in the first air channel and the second air channel are reflected and scattered to be respectively received by the first light sensor and the second light sensor to generate corresponding electric signals, so that the problem that the existing double-channel air quality detection module is poor in detection accuracy is solved.
Description
Technical Field
The invention relates to the field of air quality detection equipment, in particular to a dual-channel air quality detection module.
Background
Along with the improvement of the requirements of people on living quality, the automobile is provided with a dual-channel PM2.5 sensor to measure the concentration of dust particles inside and outside the automobile, and the air conditioner is combined to realize air filtration or switch the internal and external circulation mode of the air conditioner, so that the pollution of air inside the automobile is avoided, and the freshness of the air of a driving environment is ensured.
The applicant provides a double-channel air quality detection device with application number 201720077961.1, which is small in size, simple in structure and low in cost on the basis of not using a stepping motor and a three-way valve; and two paths of independent detection air passages are formed, so that mutual interference is avoided, and the detection is more accurate. However, the above-mentioned dual-channel air quality detection device needs to be configured with one laser module for each channel, and the cost is still high.
For this reason, the applicant proposed a dual-channel air quality detection module in application No. 201820299630.7, which can save the cost of the laser module by using a single laser module to detect the air quality in the dual channels. However, the laser emitted by the laser module in the dual-channel air quality detection module passes through the first channel and then enters the second channel again, and when the dust concentration in the first channel is too high, the laser beam entering the second channel has the problem of dispersion, which leads to the reduction of the detection precision of the second channel.
Disclosure of Invention
The invention aims to provide a double-channel air quality detection module, which adopts a single laser module to realize double-channel air quality detection, and laser beams in the double channels are independent and do not interfere with each other.
The specific scheme is as follows:
the utility model provides a binary channels air quality detection module, includes the casing and is located the relative both sides of casing and the first wind channel and the second wind channel of mutual isolation setting, a laser module and a spectroscope have in the casing, first photo-sensor and second photo-sensor have respectively in first wind channel and the second wind channel, and have respectively on the casing with first wind channel second wind channel intercommunication set up first light-emitting hole and second light-emitting hole, the light of laser module outgoing separates into two laser beams via the reflection of spectroscope, and two laser beams enter into first wind channel second wind channel from first light-emitting hole and second light-emitting hole respectively to by the dust particle reflection in first wind channel and the second wind channel, the scattering and receive respectively by first photo-sensor and second photo-sensor and produce corresponding signal of telecommunication.
Furthermore, the spectroscope comprises a first spectroscope surface and a second spectroscope surface which are perpendicular to each other, and the intersection line of the first spectroscope surface and the second spectroscope surface is arranged over against the laser module.
Furthermore, the laser module comprises a laser diode and a lens, and light emitted by the laser diode is converged by the lens to irradiate the spectroscope.
Furthermore, the first light sensor and the second light sensor both comprise an outer shell and a light sensing element positioned in the outer shell, and the outer shell is provided with a light inlet hole.
Furthermore, the two laser beams divided by the spectroscope are respectively focused in the first air channel and the second air channel, and the focus is positioned right above the center of the light inlet hole.
Further, the light inlet hole is in a horn shape with the aperture gradually decreasing from the outer surface of the outer shell to the inner portion.
Furthermore, the first light emitting hole and the second light emitting hole are both circular through holes.
Furthermore, the first light outlet hole and the second light outlet hole are internally provided with light-transmitting isolating films which isolate and seal the inside of the shell from the first air channel and the second air channel.
Furthermore, the two opposite sides of the first air duct and the second air duct are respectively provided with a light trap, and the light trap is provided with a light inlet hole communicated with the first air duct or the second air duct.
Furthermore, the optical trap is a cavity of a right triangle, the inclined edge of the optical trap is just opposite to the light inlet hole, the first right-angle edges of the two right-angle edges are connected with the shell, the second right-angle edge is perpendicular to the shell, and a plurality of concave areas are further arranged on the inner wall of the second right-angle edge.
Compared with the prior art, the dual-channel air quality detection module provided by the invention has the following advantages: the dual-channel air quality detection module provided by the invention divides a single laser beam generated by the single laser module into two independent laser beams through the spectroscope, the two laser beams respectively irradiate the first air channel and the second air channel which are separately arranged, and laser beams which are complementarily influenced are provided for the first light sensor and the second light sensor in the first air channel and the second air channel, so that electric signals generated by the first light sensor and the second light sensor are not influenced with each other, and the cost and the volume of the dual-channel air quality detection module are also reduced.
Drawings
FIG. 1 shows a cross-sectional view of a front side of a dual channel air quality detection module.
Fig. 2 shows a schematic diagram of the path of light in a dual channel air quality detection module.
FIG. 3 shows a cross-sectional view of a side of a dual channel air quality detection module.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 1-2, the present embodiment provides a dual-channel air quality detection module, which includes a housing 10, and a laser module 20, a lens 30 and a beam splitter 40 located in the housing 10, wherein two opposite sides of the housing 10 respectively have a first air duct 50 and a second air duct 51 that are separately arranged, and the first air duct 50 and the second air duct 51 respectively have a first photo sensor 60 and a second photo sensor 61 therein.
The laser beam emitted from the laser module 20 is primarily condensed by the lens 30 and then irradiates the beam splitter 40, the beam splitter 40 has a first light dividing surface 400 and a second light dividing surface 401, the laser beam irradiating on the beam splitter 40 is respectively reflected by the first light dividing surface 400 and the second light dividing surface 401 to the first air duct 50 and the second air duct 51, the dust particles in the first air duct 50 and the second air duct 51 are irradiated by the laser beam to be reflected and scattered and respectively received by the first light sensor 60 and the second light sensor 61 to generate corresponding electric signals, and the electric signals generated by the first light sensor 60 and the second light sensor 61 can respectively calculate the concentrations of the dust particles in the first air duct 50 and the second air duct 51. It should be clear that the housing 10 has a first light exit hole 100 and a second light exit hole 101 for passing the laser beams reflected by the first light splitting surface 400 and the second light splitting surface 401 into the first air duct 50 and the second air duct 51.
Therefore, the dual-channel air quality detection module divides the single laser beam generated by the single laser module 20 into two independent laser beams through the spectroscope 40, the two laser beams respectively irradiate the first air duct 50 and the second air duct 51 which are separately arranged, and the laser beams with complementary influences are provided for the first light sensor 60 and the second light sensor 61 in the first air duct 50 and the second air duct 51, so that electric signals generated by the first light sensor 60 and the second light sensor 61 are not influenced by each other, and the cost and the volume of the dual-channel air quality detection module are also reduced. Preferably, an exhaust device 500, such as a fan or an air pump, is provided at the outlet of each of the first air duct 50 and the second air duct 51 to generate a suction force to the first air duct 50 or the second air duct 51.
In the present embodiment, the housing 10 may be made of a metal material such as an aluminum alloy, a zinc alloy, or the like, or a plastic material that meets requirements. The laser module 20 is a laser diode, and compared with other laser modules, the laser diode has lower cost and also has smaller volume, the lens 30 is a double-convex lens, an inner fixing sleeve 11 is arranged in the shell 10, the lens 30 and the laser module 20 are both fixed on the inner fixing sleeve 11 so as to realize the relative fixation of the positions of the lens 30 and the laser module 20, and the laser diode can generate a laser beam meeting the requirements through the primary condensation of the lens 30 so as to reduce the cost and the volume of the dual-channel air quality detection module.
Preferably, the laser module 20 has a plurality of positioning posts, specifically, the bottom of the laser module 20 in this embodiment has a first positioning post 200 which can be conveniently installed on the circuit board, and the upper end of the tail end of the laser diode also has two second positioning posts 201 to prevent the circuit board from rotating and damaging the PIN of the laser diode when being soldered to the circuit board.
In this embodiment, referring to fig. 1 and fig. 2, the first light splitting surface 400 and the second light splitting surface 401 of the light splitter 40 are reflection surfaces that are perpendicular to each other, and an intersection line of the first light splitting surface 400 and the second light splitting surface 401 is directly opposite to the laser module 20, so that the first light splitting surface 400 and the second light splitting surface 401 of the light splitter 40 split the laser light emitted from the laser module 20 into two laser beams that are symmetrically distributed on the left and right sides, that is, the intensities of the laser beams entering the first air duct 50 and the second air duct 51 are the same, and therefore the first light sensor 60 and the second light sensor 61 in the first air duct 50 and the second air duct 51 have the same calculation mode, and are easy to operate.
Preferably, the two laser beams split by the first light splitting surface 400 and the second light splitting surface 401 of the light splitter 40 from the laser module 20 are focused at the centers right above the light sensors of the first light sensor 60 and the second light sensor 61 in the first air duct 50 and the second air duct 51, respectively, so that the light sensors in the first light sensor 60 and the second light sensor 61 can receive the most light.
In this embodiment, referring to fig. 3, the first photo sensor 60 and the second photo sensor 61 are identical devices, and each of the first photo sensor 60 and the second photo sensor 61 includes an outer casing 600 and a photo sensor 601 located inside the outer casing 600, and the outer casing 600 has a light inlet 602, where the light inlet 602 needs to be adjusted according to the shape and size of the photo sensor 601 to ensure that the photo sensor 601 can receive the most light after the laser irradiates the particles and is reflected and scattered. In this embodiment, the light sensor 601 is a silicon photodiode, the light inlet 602 is a circular through hole, and the laser beam incident to the first air duct 50 and the second air duct 51 is focused on the center of the circular light inlet 602.
Preferably, the light inlet 602 in this embodiment is a chamfered through hole, and the light inlet 602 is in a horn shape with a gradually decreasing aperture from the outer surface to the inner surface of the outer housing 600, so that diffracted light, stray light, and the like emitted from the first light outlet 100 or the second light outlet 101 can be prevented from entering the outer housing 600 from the light inlet 602 and being received by the light sensor 601, and the accuracy of the electrical signal generated by the light sensor 601 can be ensured.
In this embodiment, referring to fig. 3, the first light exit hole 100 and the second light exit hole 101 are both semicircular through holes, and in this embodiment, the first light exit hole 100 and the second light exit hole 101 have the same shape and size, so the second light exit hole 101 is taken as an example for description. As shown in fig. 2, the first air duct 50 and the second air duct 51 in this embodiment are respectively located on the left and right sides of the housing 10, the laser module 20 is installed at the lower portion of the housing 10, the beam splitter 40 is located at the upper portion of the housing 10, and the second light exit hole 101 is a semicircular through hole formed at the upper half portion thereof, so as to reduce diffracted light and stray light generated by the laser beam exiting from the second light exit hole 101, and improve the accuracy of the electrical signal generated by the light sensor 601.
In this embodiment, preferably, the first light emitting hole 100 and the second light emitting hole 101 are provided with a light-transmitting isolation film for isolating and sealing the first air duct 50, the second air duct 51 and the inside of the housing 10, so that the housing is sealed, and the detection precision is prevented from being reduced due to the mutual influence of the air blowby of the inner air duct and the outer air duct caused by the difference in air pressure of the first air duct 50 and the second air duct 51. Preferably, the light-transmitting isolating film is an antireflection film.
In this embodiment, referring to fig. 1 and fig. 2, a light trap 70 is disposed on both a side of the first air duct 50 facing the first light outlet 100 and a side of the second air duct 51 facing the second light outlet 101. The light trap 70 has a light inlet 700 communicated with the first air duct 50 or the second air duct 51, the laser beam in the first air duct 50 or the second air duct 51 can enter the corresponding light trap 70 from the corresponding light inlet 700, and the light entering the light trap 70 can be reflected for a plurality of times in the light trap 70 to be extinguished without entering the first air duct 50 or the second air duct 51 again from the light inlet 700, so that the precision of the electrical signal generated by the light sensor 601 is not affected.
Specifically, the optical trap 70 is a cavity of a right triangle, the hypotenuse of the optical trap 70 is opposite to the light inlet 700, one of the two right-angled sides is connected to the housing 10, the other right-angled side is perpendicular to the housing 10, and light entering from the light inlet 700 is reflected by the hypotenuse to avoid the light inlet 700, so as to avoid being reflected out from the light inlet 700.
Preferably, a plurality of concave regions are further disposed on the right-angle side perpendicular to the housing 10, and the plurality of concave regions are sequentially disposed along the length direction of the right-angle side at intervals, so that light can be reflected multiple times in the concave regions for extinction.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A binary channels air quality detection module which characterized in that: the laser device comprises a shell, a first air channel and a second air channel, wherein the first air channel and the second air channel are located on two opposite sides of the shell and are arranged in an isolated mode, a laser module and a spectroscope are arranged in the shell, a first light sensor and a second light sensor are arranged in the first air channel and the second air channel respectively, a first light outlet hole and a second light outlet hole which are communicated with the first air channel and the second air channel respectively are formed in the shell, light emitted by the laser module is reflected by the spectroscope to be separated into two laser beams, and the two laser beams enter the first air channel and the second air channel from the first light outlet hole and the second light outlet hole respectively and are reflected and scattered by dust particles in the first air channel and the second air channel to be received by the first light sensor and the second light sensor respectively to generate corresponding electric signals.
2. The dual channel air quality detection module of claim 1, wherein: the spectroscope comprises a first light splitting surface and a second light splitting surface which are perpendicular to each other, and the intersection line of the first light splitting surface and the second light splitting surface is arranged over against the laser module.
3. The dual channel air quality detection module of claim 1, wherein: the laser module comprises a laser diode and a lens, and light emitted by the laser diode is converged by the lens to irradiate the spectroscope.
4. The dual channel air quality detection module of claim 1, wherein: the first light sensor and the second light sensor both comprise an outer shell and a light sensing piece positioned in the outer shell, and the outer shell is provided with a light inlet hole.
5. The dual channel air quality detection module of claim 4, wherein: the two laser beams divided by the spectroscope are respectively focused in the first air channel and the second air channel, and the focus is positioned right above the center of the light inlet hole.
6. The dual channel air quality detection module of claim 4, wherein: the light inlet hole is in a horn shape with the aperture gradually reduced from the outer surface of the outer shell to the inner part.
7. The dual channel air quality detection module of claim 1, wherein: the first light emitting hole and the second light emitting hole are both circular through holes.
8. The dual channel air quality detection module of claim 1, wherein: and the first light outlet hole and the second light outlet hole are internally provided with light-transmitting isolating films which isolate and seal the inside of the shell from the first air channel and the second air channel.
9. The dual channel air quality detection module of claim 1, wherein: and the two opposite sides of the first air duct and the second air duct are respectively provided with a light trap, and the light trap is provided with a light inlet communicated with the first air duct or the second air duct.
10. The dual channel air quality detection module of claim 9, wherein: the light trap is a right-angled triangle cavity, the inclined edge of the light trap is just opposite to the light inlet hole, the first right-angle edges of the two right-angle edges are connected with the shell, the second right-angle edge is perpendicular to the shell, and a plurality of concave areas are further arranged on the inner wall of the second right-angle edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911323244.2A CN110895235A (en) | 2019-12-20 | 2019-12-20 | Binary channels air quality detection module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911323244.2A CN110895235A (en) | 2019-12-20 | 2019-12-20 | Binary channels air quality detection module |
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| CN110895235A true CN110895235A (en) | 2020-03-20 |
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| CN201911323244.2A Pending CN110895235A (en) | 2019-12-20 | 2019-12-20 | Binary channels air quality detection module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021057792A1 (en) * | 2019-09-24 | 2021-04-01 | 法雷奥汽车空调湖北有限公司 | Particulate matter sensor and vehicle air conditioner assembly |
| CN113466093A (en) * | 2020-03-31 | 2021-10-01 | 比亚迪半导体股份有限公司 | Aerosol detection device |
| WO2024055377A1 (en) * | 2022-09-15 | 2024-03-21 | 厦门美时美克空气净化有限公司 | Single-laser dual-channel dust sensor |
-
2019
- 2019-12-20 CN CN201911323244.2A patent/CN110895235A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021057792A1 (en) * | 2019-09-24 | 2021-04-01 | 法雷奥汽车空调湖北有限公司 | Particulate matter sensor and vehicle air conditioner assembly |
| CN113466093A (en) * | 2020-03-31 | 2021-10-01 | 比亚迪半导体股份有限公司 | Aerosol detection device |
| WO2024055377A1 (en) * | 2022-09-15 | 2024-03-21 | 厦门美时美克空气净化有限公司 | Single-laser dual-channel dust sensor |
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