Infrared dual-gas sensor

Abstract

The utility model relates to an infrared double gas sensor. The gas sensor comprises a reflecting cover and a base, the reflecting cover has an arc reflecting surface and an air inlet hole, the base has a base cavity, the sidewall of the base cavity is provided with an infrared light source, a first gas sensor and a second gas sensor in a circumferential direction, the bottom wall of the base cavity is provided with first, second and third reflecting slopes. The infrared light is reflected to the arc reflecting surface through the first reflecting slope, part of the infrared light is reflected to the second reflecting slope and received by the first gas sensor, and part of the infrared light is reflected to the third reflecting slope and received by the second gas sensor. The signal changes of the two gas sensors are detected through the circuit board, and finally the composition and concentration of the two kinds of gases are obtained. The sensor of the utility model can detect two different gases in the environment at the same time, compared with the prior art, the integration not only reduces the overall volume, but also reduces the detection cost, and is convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of sensors, specifically to an infrared dual-gas sensor. Background Technology

[0002] Infrared gas sensors are high-precision sensing devices that detect gas concentration based on the absorption characteristics of gas molecules to specific wavelengths of infrared light and according to Beer-Brønsley's law. They are primarily used to identify gas components and determine their concentrations. Their core principle is that the absorption of infrared light caused by vibrational and rotational energy level transitions in gas molecules is used to calculate concentration by measuring the attenuation of light intensity. They offer advantages such as high selectivity, strong anti-interference capabilities, and long lifespan. They are widely used in environmental monitoring (carbon dioxide and methane detection), industrial safety (petrochemical and metallurgical industries), and medical diagnostics (exhaled gas analysis), and are gradually replacing traditional electrochemical sensors as the mainstream technology.

[0003] Existing infrared sensors can only detect one specific gas, such as a methane gas sensor for methane and a carbon dioxide gas sensor for carbon dioxide. They cannot detect both methane and carbon dioxide in the environment simultaneously with a single gas sensor, which leads to high detection costs, large space requirements, and inconvenience in use. Utility Model Content

[0004] The purpose of this invention is to provide an infrared dual-gas sensor to solve the problems of existing technologies where a single gas sensor cannot detect two gases simultaneously, resulting in high detection costs, large space requirements, and inconvenience in use.

[0005] To achieve the above objectives, the present invention provides an infrared dual-gas sensor with the following technical solution: An infrared dual-gas sensor includes a reflective cover and a base arranged sequentially from top to bottom. The reflective cover has a reflective cover cavity with a downward opening and an air inlet. The base has a base cavity with an upward opening. An infrared light source, a first gas sensor, and a second gas sensor are arranged circumferentially at intervals on the side wall of the base cavity. A first reflective slope, a second reflective slope, and a third reflective slope are arranged on the bottom wall of the base cavity, respectively facing the infrared light source, the first gas sensor, and the second gas sensor. The cavity surface of the reflective cover cavity is an arc-shaped reflective surface, used to reflect the infrared light emitted from the first reflective slope to the second and third reflective slopes. The first gas sensor receives the infrared light reflected from the second reflective slope, and the second gas sensor receives the infrared light reflected from the third reflective slope. The infrared light source, the first gas sensor, and the second gas sensor are connected to a circuit board, which has pins.

[0006] The base cavity has a base platform on its bottom wall, and the first reflective slope, the second reflective slope and the third reflective slope are all located on the base platform.

[0007] The base is positioned close to the infrared light source.

[0008] The cavity surface of the reflective cover is a spherical reflective surface.

[0009] The infrared light source, the first gas sensor, and the second gas sensor are evenly spaced along the circumferential direction of the base.

[0010] The infrared dual gas sensor includes a housing, a reflective cover, a base, an infrared light source, a first gas sensor, a second gas sensor, and a circuit board, all located inside the housing, with pins extending outside the housing.

[0011] A base plate is provided inside the housing and below the circuit board, and the base plate has through holes for pins to pass through.

[0012] The beneficial effects of this invention are as follows: Infrared light is emitted by a set infrared light source. The infrared light travels to the first reflective slope directly opposite the infrared light source, which then reflects it onto the arc-shaped reflective surface on the reflective cover above. A portion of the infrared light from the arc-shaped reflective surface is reflected onto the second reflective slope, and then reflected again by the second reflective slope to the first gas sensor for reception; another portion of the infrared light is reflected onto the third reflective slope, and then reflected again by the third reflective slope to the second gas sensor for reception. By detecting the signal changes of the two gas sensors through a circuit board, the composition and concentration of the corresponding two gases are finally determined. This invention's sensor can simultaneously detect two different gases in the environment. Compared with existing technologies, integrating them not only reduces the overall size but also lowers detection costs and is convenient to use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of one embodiment of an infrared dual-gas sensor according to this utility model; Figure 2 yes Figure 1 A schematic diagram of the structure after removing the outer shell; Figure 3 yes Figure 1 A schematic diagram of the structure after removing the outer shell and reflector cover; Figure 4 yes Figure 1 A schematic diagram of the reflective cover. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0015] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The use of "belonging" in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this invention.

[0016] An embodiment of this utility model of an infrared dual-gas sensor, such as... Figures 1-4 As shown, the device includes an outer shell 1, inside which, from top to bottom, are arranged a reflector 2, a base 3, a circuit board 4, and a bottom plate 5. The reflector 2 has a reflector cavity with its opening facing downwards, and the base has a base cavity 11 with its opening facing upwards. The reflector cavity and the base cavity form a detection chamber. The reflector 2 is provided with an air inlet 6 to allow gas from the environment to enter the detection chamber.

[0017] Infrared light source 7, first gas sensor 8, and second gas sensor 9 are evenly spaced along the circumference of the sidewall of the base cavity. The first gas sensor 8 and the second gas sensor 9 are used to detect different gases. In this embodiment, the first gas sensor 8 can be a methane gas sensor, and the second gas sensor 9 can be a carbon dioxide gas sensor. A base 13 is provided on the bottom wall of the base cavity 11, and the base 13 is positioned close to the infrared light source 7. A first reflective slope 14 facing the infrared light source 7, a second reflective slope 15 facing the first gas sensor 8, and a third reflective slope 16 facing the second gas sensor 12 are respectively provided on the base 13. In this embodiment, the cavity surface of the reflective cover cavity is an arc-shaped reflective surface 17, specifically, the arc-shaped reflective surface is a spherical reflective surface, used to reflect the infrared light emitted from the first reflective slope to the second and third reflective slopes.

[0018] Infrared light source 7, first gas sensor 8, and second gas sensor 9 are connected to circuit board 4. The circuit board is an MCU (microcontroller unit), and pins 9 are provided on circuit board 4. The base plate 5 has through holes 10 for the pins 9 to pass through. In this embodiment, the upper end of the outer shell has an opening to expose the air inlet on the reflector cover, and the lower end of the outer shell is open to facilitate the installation of components such as the reflector cover, base, and base plate. The upper end of the outer shell and the base plate together fix and encapsulate the internal components. Only the pins extend downwards from the base plate and the outer shell to realize power supply and communication.

[0019] In use, the infrared light source 7 emits infrared light, which travels to the first reflective slope 14 facing it. The first reflective slope 14 reflects the infrared light onto the arc-shaped reflective surface 17 on the reflective cover 2 above. A portion of the infrared light on the arc-shaped reflective surface 17 is reflected onto the second reflective slope 15, and then reflected by the second reflective slope 15 to the first gas sensor 8 for reception; another portion of the infrared light is reflected onto the third reflective slope 16, and then reflected by the third reflective slope 16 to the second gas sensor 12 for reception. Then, the circuit board 4 detects the signal changes of the first and second gas sensors, and finally determines the composition and concentration of the two gases.

[0020] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0022] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0023] In other embodiments of this utility model, the number of bases can also be three, in which case a reflective slope can be provided on each base; the position of the bases can also be adjusted as needed; the infrared light source, the first gas sensor and the second gas sensor can also be arranged at non-uniform intervals along the circumferential direction of the base.

Claims

1. An infrared dual-gas sensor, characterized in that: The device includes a reflective cover and a base arranged sequentially from top to bottom. The reflective cover has a reflective cover cavity with a downward opening and an air inlet. The base has a base cavity with an upward opening. An infrared light source, a first gas sensor, and a second gas sensor are arranged circumferentially at intervals on the side wall of the base cavity. A first reflective slope, a second reflective slope, and a third reflective slope are arranged on the bottom wall of the base cavity, respectively facing the infrared light source, the first gas sensor, and the second gas sensor. The cavity surface of the reflective cover cavity is an arc-shaped reflective surface, used to reflect the infrared light emitted from the first reflective slope to the second and third reflective slopes. The first gas sensor receives the infrared light reflected from the second reflective slope, and the second gas sensor receives the infrared light reflected from the third reflective slope. The infrared light source, the first gas sensor, and the second gas sensor are connected to a circuit board, which has pins.

2. The infrared dual-gas sensor according to claim 1, characterized in that: The base cavity has a base platform on its bottom wall, and the first reflective slope, the second reflective slope and the third reflective slope are all located on the base platform.

3. The infrared dual-gas sensor according to claim 2, characterized in that: The base is positioned close to the infrared light source.

4. The infrared dual-gas sensor according to claim 1, characterized in that: The cavity surface of the reflective cover is a spherical reflective surface.

5. The infrared dual-gas sensor according to claim 1, characterized in that: The infrared light source, the first gas sensor, and the second gas sensor are evenly spaced along the circumferential direction of the base.

6. The infrared dual-gas sensor according to any one of claims 1-5, characterized in that: The infrared dual gas sensor includes a housing, a reflective cover, a base, an infrared light source, a first gas sensor, a second gas sensor, and a circuit board, all located inside the housing, with pins extending outside the housing.

7. The infrared dual-gas sensor according to claim 6, characterized in that: A base plate is provided inside the housing and below the circuit board, and the base plate has through holes for pins to pass through.

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