CN115356280A - Carbon dioxide sensor based on NDIR principle - Google Patents
Carbon dioxide sensor based on NDIR principle Download PDFInfo
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- CN115356280A CN115356280A CN202210922201.1A CN202210922201A CN115356280A CN 115356280 A CN115356280 A CN 115356280A CN 202210922201 A CN202210922201 A CN 202210922201A CN 115356280 A CN115356280 A CN 115356280A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 43
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 43
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 title claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 70
- 238000005192 partition Methods 0.000 claims description 31
- 239000000565 sealant Substances 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000007738 vacuum evaporation Methods 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 claims 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 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
- 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
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a carbon dioxide sensor based on NDIR principle, comprising: the device comprises an optical cavity, an infrared light source, an infrared detector and a circuit board; the surface of the optical cavity is provided with air holes, an optical air chamber is formed inside the optical cavity, and the air holes are communicated with the optical air chamber; the surfaces of the air holes are adhered with waterproof breathable films; the infrared light source and the infrared detector are respectively welded on the circuit board; the circuit board is fixedly connected with the optical cavity, and the infrared light source and the infrared detector are respectively positioned in the optical air chamber; the light emitted by the infrared light source is reflected to the infrared detector after being reflected by the optical air chamber for many times. The invention has the characteristics of high signal-to-noise ratio, good repeatability and high stability.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a carbon dioxide sensor based on an NDIR principle.
Background
Carbon dioxide is ubiquitous in daily life, for example: carbon dioxide is an essential raw material for plant photosynthesis; the fire extinguisher can be manufactured; carbon dioxide is used as a chemical raw material for many chemical products, such as relatively familiar calcium carbonate and sodium carbonate; carbon dioxide in the solid state may also be used as a refrigerant, etc.
With the continuous development of science and technology, people have higher living standard, people pay more attention to their health, and equipment and components related to carbon dioxide are more and more, so that the demand on quantitative detection and control of carbon dioxide gas is higher and more.
However, most of the existing carbon dioxide sensors have the problems of low signal-to-noise ratio, poor repeatability, slow response, poor stability and the like.
Therefore, how to provide a carbon dioxide sensor based on the NDIR principle with high signal-to-noise ratio, strong repeatability and good stability is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a carbon dioxide sensor based on the NDIR principle, which has the characteristics of high signal-to-noise ratio, good repeatability and high stability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a NDIR principle based carbon dioxide sensor comprising: the infrared detector comprises an optical cavity, an infrared light source, an infrared detector and a circuit board;
the surface of the optical cavity is provided with air holes, an optical air chamber is formed inside the optical cavity, and the air holes are communicated with the optical air chamber; the surfaces of the air holes are adhered with waterproof breathable films;
the infrared light source and the infrared detector are respectively welded on the circuit board; the circuit board is fixedly connected with the optical cavity, and the infrared light source and the infrared detector are respectively positioned in the optical air chamber;
and light rays emitted by the infrared light source are reflected to the infrared detector after being reflected by the optical air chamber for multiple times.
Further, in the above-mentioned carbon dioxide sensor based on the NDIR principle, the optical cavity includes a housing and a partition plate; a circle of first dispensing groove is formed in the edge of one surface, assembled with the shell, of the partition plate; sealant is filled in the first dispensing groove; the shell and the partition plate are bonded through a sealant and enclose the optical air chamber.
Furthermore, in the carbon dioxide sensor based on the NDIR principle, a circle of second glue dispensing groove is formed in one surface, which is assembled with the circuit board, of the partition board; the second glue dispensing groove is filled with sealant; the circuit board is adhered to the partition plate through a sealant.
Further, in the carbon dioxide sensor based on the NDIR principle, mounting holes are formed at positions where the edges of the housing, the partition plate and the circuit board correspond to each other; the shell, the partition plate and the circuit board are fastened by penetrating through the mounting holes through bolts.
Further, in the above-described carbon dioxide sensor based on the NDIR principle, the optical gas chamber includes: a light source focusing cup, three reflecting surfaces and a detector focusing cup; after being reflected by the light source light-gathering cup, the light emitted by the infrared light source is reflected to the detector light-gathering cup through the three reflecting surfaces in sequence and then reflected to the infrared detector through the detector light-gathering cup.
Further, in the above carbon dioxide sensor based on the NDIR principle, the geometric shapes of the light source light-gathering cup, the three reflecting surfaces and the detector light-gathering cup are all non-free curved surfaces.
Furthermore, the geometric shape of the light source light-gathering cup is an elliptic cylindrical surface; the geometric shapes of the three reflecting surfaces are arc surfaces; the geometry of the detector light gathering cup is a portion of a sphere.
Further, in the above-mentioned carbon dioxide sensor based on NDIR principle, the surface of the optical gas cell has a vacuum evaporation coating, and the thickness of the vacuum evaporation coating is 50nm to 300nm.
Further, in the carbon dioxide sensor based on the NDIR principle, the surface of the optical cavity is a textured surface.
Further, in the carbon dioxide sensor based on the NDIR principle, after the light emitted from the infrared light source is reflected by the optical air chamber for multiple times, the optical path length is greater than or equal to 130mm.
Further, in the carbon dioxide sensor based on the NDIR principle, an identification code label is attached to the back surface of the circuit board.
Through the technical scheme, compared with the prior art, the invention discloses the carbon dioxide sensor based on the NDIR principle, and the carbon dioxide sensor based on the NDIR principle has the following beneficial effects:
1. the invention has compact integral structure and high integration degree, can prevent water from entering the optical air chamber and increases the stability and reliability of the product.
2. According to the invention, after light rays emitted by the infrared light source are reflected by the optical air chamber for multiple times, the optical path length can be greatly improved, so that the light rays are more effectively utilized, and the stability, repeatability and reliability of the sensor are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is an exploded view of a carbon dioxide sensor according to the NDIR principle of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a carbon dioxide sensor based on NDIR principle according to the present invention;
FIG. 3 is a schematic diagram of an optical cavity structure according to the present invention;
FIG. 4 is a diagram of the path of light within an optical gas cell provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-2, the embodiment of the invention discloses a carbon dioxide sensor based on NDIR principle, comprising: the device comprises an optical cavity, an infrared light source 1, an infrared detector 2 and a circuit board 3;
the surface of the optical cavity is provided with air holes 4, an optical air chamber a is formed inside the optical cavity, and the air holes 4 are communicated with the optical air chamber a; a waterproof breathable film 5 is attached to the surface of the air hole 4; the waterproof breathable film 5 can allow gas to pass through and prevent water from passing through;
the infrared light source 1 and the infrared detector 2 are respectively welded on the circuit board 3; the circuit board 3 is fixedly connected with the optical cavity, and the infrared light source 1 and the infrared detector 2 are respectively positioned in the optical air chamber;
the light emitted by the infrared light source 1 is reflected to the infrared detector 2 after being reflected by the optical air chamber for many times. The infrared detector 2 determines the concentration of carbon dioxide based on the intensity of the received light.
In one embodiment, the optical cavity comprises a housing 6 and a baffle 7; a circle of first dispensing groove 8 is formed in the edge of one surface, assembled with the shell 6, of the partition plate 7; the first dispensing groove 8 is filled with sealant 9; the shell 6 and the partition 7 are bonded by a sealant 9 and enclose an optical air chamber.
In one embodiment, a second glue dispensing groove 10 is formed in one surface of the partition 7, which is assembled with the circuit board 3; sealant is filled in the second dispensing groove 10; the circuit board 3 and the spacer 7 are bonded by a sealant. In the embodiment of the invention, the two end face edges of the partition board 7 are respectively provided with a circle of glue dispensing grooves, when the partition board is assembled with the shell 6 and the circuit board 3, the partition board is bonded by the sealant, so that the fixation is firm, external water is prevented from entering the optical cavity due to the sealing performance of the sealant, the partition board has good waterproof performance, and the stability, reliability and repeatability of a product are improved.
More advantageously, the housing 6, the partition 7 and the circuit board 3 are provided with mounting holes 11 at positions corresponding to each other; the housing 6, the partition 7, and the circuit board 3 are fastened by bolts 12 through the mounting holes 11. According to the invention, the shell 6, the partition plate 7 and the circuit board 3 are fastened through the bolts 11, so that the overall firmness and the integration degree of the product are further improved.
In one embodiment, the back of the circuit board 3 is pasted with an identification code label 12, the identification code label specifically adopts a two-dimensional code label, and the product can be traced through the two-dimensional code label.
The assembly process of the carbon dioxide sensor comprises the following steps:
(1) Welding infrared detector 2 and infrared light source 1: respectively welding the infrared detector 2 and the infrared light source 1 to a detector circuit and a light source circuit part corresponding to the circuit board 3;
(2) Printing and sticking a label: printing a two-dimensional code label 12, and pasting the two-dimensional code label at a designated position on the back of the circuit board 3 for product tracing;
(3) Assembling the partition board with the shell: dropping the sealant 9 into a first dispensing groove 8 on the assembling surface of the partition plate 7 and the shell 6, and then buckling the shell 6 on the partition plate 7 to form an optical cavity inside;
(4) The partition 7 is assembled with the circuit board 3: dropping the sealant 9 into a second dispensing groove 10 (the other side of the partition) of the partition 7, and then buckling the circuit board 3 into the partition 7;
(5) And (3) mounting screws: fixing the circuit board 3, the partition board 7 and the shell 6 together by four self-tapping screws 11;
(6) Pasting a waterproof breathable film: and sticking the waterproof breathable film 5 to the air holes 4 on the surface of the optical cavity for air exchange.
In one particular embodiment, as shown in FIGS. 3-4, the optical gas cell comprises: a light source condenser cup 13, three reflecting surfaces, and a detector condenser cup 14; after being reflected by the light source light-gathering cup 13, the light emitted by the infrared light source 1 is reflected to the detector light-gathering cup 14 through the three reflecting surfaces in sequence, and then is reflected to the infrared detector 2 through the detector light-gathering cup 14.
In this embodiment, the three reflection surfaces are a first reflection surface 15, a second reflection surface 16, and a third reflection surface 17, respectively, light is emitted from the infrared light source 1, a part of the light directly reaches the first reflection surface 15, a part of the light passes through the light source light-gathering cup 13 and then reaches the first reflection surface 15, the light is reflected by the first reflection surface 15 to the second reflection surface 16 and then to the third reflection surface 17, and then is reflected by the third reflection surface 17 to the detector light-gathering cup 14 and then to the infrared detector 2.
The carbon dioxide sensor of the invention has the following principle: the infrared light source emits an infrared light beam to pass through the optical gas chamber, and each gas component in the sample absorbs infrared rays with specific frequency. The concentration of the gas component can be determined by receiving and measuring the infrared absorption amount of the corresponding frequency through an infrared detector and combining with the algorithm analysis arranged in the embedded software.
Therefore, the more light rays can be received by the infrared detector, the more the infrared absorption amount is, and the measured signal intensity is also high.
In one embodiment, the optical path length of the light emitted by the infrared light source is greater than or equal to 130mm after the light is reflected by the optical air chamber for multiple times. The light emitted from the infrared light source is reflected to the infrared detector for receiving the light for four times, so that the optical path length is greatly increased, the light is more effectively utilized, the average optical path length of products of the same type in the current market is mostly below 100mm, and the average optical path length of the embodiment of the invention can reach 130mm. According to the embodiment of the invention, the optical path length is increased, so that the optical signal attenuation value is larger in a carbon dioxide gas environment with a certain specific concentration, namely the absorption rate of carbon dioxide in the optical path is higher, so that the sensitivity of the sensor is higher, the sensor has better output resolution due to high sensitivity, and the product has better stability and repeatability due to high resolution.
The geometric shapes of the light source light-gathering cup, the three reflecting surfaces and the detector light-gathering cup are non-free curved surfaces, and specifically are as follows: the light source light-gathering cup is an elliptic cylindrical surface; the three reflecting surfaces are arc surfaces; the detector light-gathering cup is a portion of a sphere.
The position of the infrared light source is a specific position, a larger part of light reflected by the non-free curved surface passes through another specific position (namely the position of the infrared detector), the two specific positions need to meet the requirements that the optical path length is larger than or equal to 130mm, and the maximum light is ensured to be emitted to the first reflecting surface, so that the purposes of increasing the signal intensity and increasing the signal to noise ratio of the product are achieved.
The surface of the optical air chamber is provided with a layer of vacuum evaporation coating, and the thickness of the vacuum evaporation coating is 50nm-300nm. Compared with conventional electroplating, the vacuum evaporation coating has the characteristics of uniformity, compactness, strong adhesive force and the like, and can effectively improve the signal intensity and stability of products.
In addition, the internal surface of the optical air chamber adopts a polishing process, so that the surface roughness of the optical air chamber reaches a specific level, the effect of increasing the signal intensity of a product is achieved, and the signal to noise ratio is increased.
In one embodiment, the optical cavity surface is an anti-striation surface. The design of the anti-grain surface enables the appearance of the sensor to be more textured.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A carbon dioxide sensor based on NDIR principles, comprising: the infrared detector comprises an optical cavity, an infrared light source, an infrared detector and a circuit board;
the surface of the optical cavity is provided with air holes, an optical air chamber is formed inside the optical cavity, and the air holes are communicated with the optical air chamber; the surfaces of the air holes are adhered with waterproof breathable films;
the infrared light source and the infrared detector are respectively welded on the circuit board; the circuit board is fixedly connected with the optical cavity, and the infrared light source and the infrared detector are respectively positioned in the optical air chamber;
and after the light rays emitted by the infrared light source are reflected by the optical air chamber for multiple times, the light rays are reflected to the infrared detector.
2. The NDIR principle based carbon dioxide sensor according to claim 1, wherein the optical cavity comprises a housing and a diaphragm; a circle of first dispensing groove is formed in the edge of one surface, assembled with the shell, of the partition plate; sealant is filled in the first dispensing groove; the shell and the partition plate are bonded through a sealant and enclose the optical air chamber.
3. The NDIR principle-based carbon dioxide sensor according to claim 2, wherein a second glue dispensing groove is formed in one surface of the partition board, which is assembled with the circuit board; the second glue dispensing groove is filled with sealant; the circuit board is adhered to the partition plate through a sealant.
4. The NDIR principle-based carbon dioxide sensor according to claim 3, wherein the housing, the partition plate and the circuit board have mounting holes at positions corresponding to the edges of the circuit board; the shell, the partition plate and the circuit board are fastened by penetrating through the mounting holes through bolts.
5. A NDIR principle based carbon dioxide sensor according to claim 1, wherein the optical gas cell comprises: a light source focusing cup, three reflecting surfaces and a detector focusing cup; after being reflected by the light source light-gathering cup, the light emitted by the infrared light source is reflected to the detector light-gathering cup through the three reflecting surfaces in sequence and then reflected to the infrared detector through the detector light-gathering cup.
6. A NDIR-principle-based carbon dioxide sensor according to claim 5, in which the geometry of the source collection cup, the three reflecting surfaces and the detector collection cup are all non-freeform surfaces.
7. The NDIR-based principle carbon dioxide sensor according to claim 6, wherein the geometry of said light source collection cup is an elliptical cylinder; the geometrical shapes of the three reflecting surfaces are arc surfaces; the geometry of the detector light gathering cup is a portion of a sphere.
8. The NDIR-principle-based carbon dioxide sensor according to claim 1, wherein the optical gas cell surface has a vacuum evaporation coating, and the thickness of the vacuum evaporation coating is 50nm-300nm.
9. The NDIR-based carbon dioxide sensor of claim 1, wherein the light from the infrared light source has an optical path length of 130mm or more after multiple reflections from the optical gas cell.
10. The NDIR principle based carbon dioxide sensor according to claim 1, wherein an identification code label is attached to the back of the circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922201.1A CN115356280A (en) | 2022-08-02 | 2022-08-02 | Carbon dioxide sensor based on NDIR principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922201.1A CN115356280A (en) | 2022-08-02 | 2022-08-02 | Carbon dioxide sensor based on NDIR principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115356280A true CN115356280A (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210922201.1A Pending CN115356280A (en) | 2022-08-02 | 2022-08-02 | Carbon dioxide sensor based on NDIR principle |
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| Country | Link |
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| CN (1) | CN115356280A (en) |
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- 2022-08-02 CN CN202210922201.1A patent/CN115356280A/en active Pending
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