Multi-gas component laser point type detection sensing module

Abstract

The utility model discloses a multi-gas component laser point type detection sensing module which is characterized in that the multi-gas component laser point type detection sensing module comprises a main body and a detection cavity arranged in the main body, and at least a first laser and a second laser which emit laser with different wavelengths are arranged in the detection cavity; a detector for receiving first laser emitted by the first laser and second laser emitted by the second laser is mounted in the detection cavity; a reflection assembly for reflecting the first laser or the second laser is also arranged in the detection cavity, so that the first laser and the second laser are different in optical path; a cover plate for sealing the detection cavity is arranged on the main body, and an air inlet communicated with the detection cavity is formed in the cover plate; a single module is miniaturized, the first laser device and the second laser device which emit laser with different wavelengths are integrated, the optical path difference of the two laser beams is achieved through the reflection assembly, detection of the two laser beams is achieved through the same detector, and at least two kinds of gas are detected.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a multi-gas component laser point detection sensing module. Background Technology

[0002] Currently, most gas detection modules on the market are single-gas detection modules, which mostly use electrochemical or infrared detection methods. To detect multiple gases, they can only be used by adding independent single-gas detection modules in combination. There is currently no single module that can detect multiple gases.

[0003] Based on the principle of Tunable Semiconductor Laser Absorption Spectroscopy (TDLAS), and utilizing the Lambert-Beer Law which states that different gases have different absorption intensities at different wavelengths, two narrow-linewidth lasers with different wavelengths were selected. By integrating these two narrow-linewidth lasers into a single module, the function of detecting multiple types of gases can be achieved with a single module.

[0004] When integrating, it is necessary to consider the miniaturization of a single module to facilitate portability and use. Simply integrating multiple lasers will result in a superimposed structure, which makes it difficult to control the size. Therefore, it is necessary to further optimize the optical path and achieve high integration to meet the miniaturization of a single module. Utility Model Content

[0005] The purpose of this invention is to provide a multi-gas component laser point detection sensing module, which achieves optical path optimization and high integration of the laser, effectively controlling the size of the sensing module to be small.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A multi-gas component laser point detection sensing module is characterized by comprising a main body and a detection cavity disposed within the main body. The detection cavity is equipped with at least a first laser and a second laser emitting lasers of different wavelengths. The detection cavity also contains a detector for receiving the first laser emitted by the first laser and the second laser emitted by the second laser. The detection cavity further includes a reflective component for reflecting the first or second laser, so that the optical paths of the first and second lasers are different. The main body is provided with a cover plate sealing the detection cavity, and the cover plate has an air inlet communicating with the detection cavity.

[0008] Preferably, the reflective assembly includes a first reflector and a second reflector spaced apart at both ends of the detection cavity. The first reflector reflects a first laser or a second laser to the second reflector, and the second reflector reflects the light to the detector.

[0009] Preferably, the detection cavity is provided with a first mounting slot for mounting the first laser, a second mounting slot for mounting the second laser, a third mounting slot for mounting the detector, a fourth mounting slot for mounting the first reflector, and a fifth mounting slot for mounting the second reflector.

[0010] Preferably, the walls of the first mounting groove, the second mounting groove, the third mounting groove and the fourth mounting groove are all coated with adhesive.

[0011] Preferably, the cover plate is equipped with a first filter screen and a second filter screen that cover the air inlet and are stacked together.

[0012] Preferably, the main body is provided with a sealing step located outside the detection cavity, and a sealing adhesive layer is provided between the cover plate and the sealing step.

[0013] Preferably, the wall of the detection cavity is coated with a black paint layer.

[0014] Preferably, a bottom cover is installed at the bottom of the main body, and an installation nut is installed on the bottom cover.

[0015] By integrating a detection cavity with a single main body, a first laser and a second laser with different wavelengths are integrated inside the detection cavity. One of the lasers is reflected by an internal reflection component and directed toward the detector, while the other laser is directed directly toward the detector. Thus, the detector can obtain signals from the first laser and the second laser after passing through at least two gases inside. Since the first laser and the second laser have different optical paths and wavelengths, their absorption intensities are different in different gases, thus satisfying the requirement that the detector can obtain different detection signals simultaneously.

[0016] Therefore, by utilizing the optical path difference, it is possible to satisfy the difference in absorption intensity after installing lasers and detectors in a small volume, thereby improving detection accuracy, increasing internal integration, and miniaturizing the whole system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the optical path of an embodiment of the present invention;

[0019] exist Figures 1 to 2 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0020] 1. Main body; 2. Detection cavity; 3. First laser; 4. Second laser; 5. Detector; 6. Reflective component; 61. First reflector; 62. Second reflector; 7. Cover plate; 8. Air inlet; 9. First mounting groove; 10. Second mounting groove; 11. Third mounting groove; 12. Fourth mounting groove; 13. Fifth mounting groove; 14. First filter screen; 15. Second filter screen; 16. Sealing step; 17. Bottom cover; 18. Mounting nut. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] See Figures 1-2 As shown, an embodiment of this utility model proposes a multi-gas component laser point detection sensing module, including a main body 1 and a detection cavity 2 disposed within the main body 1. At least a first laser 3 and a second laser 4 emitting lasers of different wavelengths are installed in the detection cavity 2. The first laser 3 and the second laser 4 are both installed on the same side of the detection cavity 2. At the same time, a detector 5 for receiving the first laser emitted by the first laser 3 and the second laser emitted by the second laser 4 is installed in the detection cavity 2. The detector 5 is installed on the other side of the detection cavity 2, so that both the first laser and the second laser can be directed towards the detector 5. In order to improve the pipeline path of one of the lasers and differentiate the absorption intensity to ensure the detection sensitivity of the detector 5, a reflective component 6 for reflecting the first laser or the second laser is also provided in the detection cavity 2 to achieve different optical paths for the first laser and the second laser. The specific detection principle is based on the principle of tunable semiconductor laser absorption spectroscopy (TDLAS).

[0023] Thus, the first laser 3, the second laser 4, and the detector 5 are integrated within a relatively small space inside the detection cavity 2. At the same time, the optical path difference between the first and second lasers is achieved by using the reflection component 6. Under the condition of small volume and short optical path, the sensitivity of the detector 5 can be improved, and the detection results of signal difference can be obtained. Meanwhile, a cover plate 7 is provided on the main body 1 to seal the detection cavity 2. The cover plate 7 is provided with an air inlet 8 that connects to the detection cavity 2. The gas to be detected is delivered into the cavity through the air inlet 8. In this embodiment, two types of gas are delivered into the cavity for detection. Lasers of different wavelengths absorb light intensity differently after passing through the gas. Combined with the detection signal, the gas type can be determined.

[0024] Meanwhile, in order to avoid the first laser and the second laser from superimposing and interfering on the detector 5, the time interval between the laser emitted by the first laser 3 and the second laser 4 can be controlled by an integrated circuit board to be 1ms.

[0025] Specifically, the circuit board is integrated at the bottom of the main body 1, thus isolating it from the detection cavity 2. The first laser 3, the second laser 4, and the detector 5 are connected to the circuit board through wires embedded inside the main body 1. The relevant control circuits can all use conventional technology.

[0026] The reflective component 6 can reflect either the first or second laser beam and guide the reflected light toward the detector 5. Specifically, the reflective component 6 includes a first reflector 61 and a second reflector 62 spaced apart at both ends of the detection cavity 2. The first reflector 61 reflects either the first or second laser beam to the second reflector 62, and the second reflector 62 reflects the light to the detector 5. Only one of the first or second laser beams needs to be reflected to create a differentiated optical path, thus achieving optical path adjustment within a minimal volume.

[0027] Specifically, the detection cavity 2 is provided with a first mounting slot 9 for mounting the first laser 3, a second mounting slot 10 for mounting the second laser 4, a third mounting slot 11 for mounting the detector 5, a fourth mounting slot 12 for mounting the first reflector 61, and a fifth mounting slot 13 for mounting the second reflector 62. Due to its small size, the space inside the detection cavity 2 is fully utilized, and the corresponding devices are embedded and installed by correspondingly opening the first mounting slot 9, the second mounting slot 10, the third mounting slot 11, the fourth mounting slot 12, and the fifth mounting slot 13.

[0028] Meanwhile, if fasteners are not used for installation, the embedded installation state needs to be further reinforced. Specifically, adhesive is applied to the walls of the first installation groove 9, the second installation groove 10, the third installation groove 11 and the fourth installation groove 12.

[0029] In order to filter the gas to be detected entering the inner cavity and prevent impurities from affecting the accuracy of the detection, a first filter screen 14 and a second filter screen 15 are installed on the cover plate 7 to cover the air inlet 8 and are stacked together. The first filter screen 14 and the second filter screen 15 have different mesh counts, which can filter in two stages without affecting the gas flow rate.

[0030] Meanwhile, a sealing step 16 is provided on the main body 1 outside the detection chamber 2, and a sealing adhesive layer is provided between the cover plate 7 and the sealing step 16. The sealing adhesive layer on the sealing step 16 and the cover plate 7 are glued and sealed together.

[0031] Meanwhile, to avoid interference such as reflections from the cavity wall of the detection cavity 2, a black coating layer is specifically applied to the cavity wall of the detection cavity 2.

[0032] Meanwhile, a bottom cover 17 is installed at the bottom of the main body 1. The bottom cover 17 is used to seal the cavity where the circuit board is installed at the bottom. Similarly, a sealing step 16 and a sealing adhesive layer can be set to achieve the sealing installation of the bottom cover 17. At the same time, an installation nut 18 is installed on the bottom cover 17 to facilitate the installation and use of the entire sensing module.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-gas component laser point-type detection sensing module, characterized in that: The application relates to a detection device, which comprises a main body (1) and a detection cavity (2) arranged in the main body (1), wherein at least a first laser (3) and a second laser (4) emitting laser beams of different wavelengths are arranged in the detection cavity (2), and a detector (5) for receiving the first laser beam emitted by the first laser (3) and the second laser beam emitted by the second laser (4) is arranged in the detection cavity (2). A reflection assembly (6) for reflecting the first laser beam or the second laser beam is arranged in the detection cavity (2), so that the optical path lengths of the first laser beam and the second laser beam are different. A cover plate (7) for sealing the detection cavity (2) is arranged on the main body (1), and an air inlet hole (8) for communicating with the detection cavity (2) is arranged on the cover plate (7). 2.The multi-gas component laser point detection sensor module according to claim 1, wherein: The reflection assembly (6) comprises a first reflection mirror (61) and a second reflection mirror (62) which are arranged at two ends of the detection cavity (2) and are spaced apart from each other, the first reflection mirror (61) reflects the first laser beam or the second laser beam to the second reflection mirror (62), and the second reflection mirror (62) reflects the light to the detector (5). 3.The multi-gas component laser point detection sensor module according to claim 2, characterized in that: A first mounting groove (9) for mounting the first laser (3), a second mounting groove (10) for mounting the second laser (4), a third mounting groove (11) for mounting the detector (5), a fourth mounting groove (12) for mounting the first reflection mirror (61) and a fifth mounting groove (13) for mounting the second reflection mirror (62) are arranged in the detection cavity (2).

4. The multi-gas component laser point detection sensor module according to claim 3, characterized in that: The groove walls of the first mounting groove (9), the second mounting groove (10), the third mounting groove (11) and the fourth mounting groove (12) are coated with an adhesive.

5. The multi-gas component laser point detection sensor module according to any one of claims 1-4, characterized in that: A first filter screen (14) and a second filter screen (15) are arranged on the cover plate (7) and are stacked.

6. The multi-gas component laser point detection sensor module according to claim 5, wherein: A sealing step (16) is arranged on the main body (1) and is located outside the detection cavity (2), and a sealing adhesive layer is arranged between the cover plate (7) and the sealing step (16).

7. The multi-gas component laser point detection sensor module according to claim 5, wherein: A black paint layer is coated on the cavity wall of the detection cavity (2). 8.The multi-gas component laser point detection sensor module according to claim 5, wherein: A bottom cover (17) is arranged at the bottom of the main body (1), and a mounting nut (18) is arranged on the bottom cover (17).

Images