Multiplexing laser gas detection device

Abstract

The utility model discloses a multiplex laser gas detection device, which comprises a base body and at least two groups of detection units, wherein a gas detection area is formed in the base body; each group of detection units comprises a laser, a photoelectric detector, a receiving part, a reflecting part and an output part, and the laser is connected to the base body and is used for emitting a laser beam; the photoelectric detector is connected to the substrate and is used for receiving a laser signal; the receiving part and the output part respectively correspond to the laser and the photoelectric detector, and the reflecting part corresponds to the receiving part and the output part, so that at least two laser paths are formed in the gas detection area, and laser beams are reflected to the corresponding photoelectric detector; the device can meet the detection requirements of various gases, is compact in structure and small in equipment size, is convenient to manufacture portable equipment, and is easily integrated into other systems, so that the whole device is lighter and is convenient to carry and use.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection technical field, concretely relates to a multiplexing laser gas detection device. BACKGROUND

[0002] A gas detection device is a device specially used for measuring the concentration of specific gases in the environment, and is widely used in many fields, including industrial safety, environmental protection, medical health and home safety. Various gas detection devices can detect various types of gases, such as flammable gases (such as methane, propane), toxic gases (such as carbon monoxide, hydrogen sulfide) and oxygen levels, etc. Through the use of these devices, the gas concentration can be monitored in real time, and potential dangers can be discovered in time, so that appropriate preventive measures can be taken to avoid possible accidents.

[0003] The patent with publication number CN109768469A provides a packaging method, a laser and a gas detection device, wherein the laser includes a semiconductor laser chip, a right-angle micro-prism for turning the light path, and a transistor shell and a spherical convex lens cap that are coaxially packaged. The spherical convex lens cap and the right-angle micro-prism cooperate to make the outgoing light of the semiconductor laser chip parallel light. Based on the special characteristics of the transistor shell, the laser does not need optical coupling, and the batch production difficulty is low. Moreover, the outgoing light of the laser is parallel light, which can be applied to a gas detection device to abandon the system with reference light beams, and easily realize the mass production of laser gas sensors at low cost.

[0004] However, the existing gas detection equipment can usually only detect a single gas, or multiple independent detection units are needed to complete the multi-gas detection task, which not only increases the cost, but also may cause problems such as large equipment size and complex operation. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above technical deficiencies, and proposes a multiplexing laser gas detection device to solve the technical problems of the existing gas detection equipment that can usually only detect a single gas, which increases the cost and leads to large equipment size and complex operation.

[0006] To achieve the above technical purposes, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of multiplexing laser gas detection device, base and at least two groups of detection units, the gas detection area is formed in the base;Each detection unit includes laser, photoelectric detector, receiving part, reflection part and output part, the laser is connected to base, for emitting laser beam;The photoelectric detector is connected to base, for receiving laser signal;The receiving part and the output part correspond to laser and photoelectric detector respectively, reflection part corresponds to receiving part and output part, to form at least two laser paths inside the gas detection area, laser beam is reflected to corresponding photoelectric detector.

[0008] In some embodiments, two sides of the base are formed with a first mounting surface and a second mounting surface respectively, two lasers and two photoelectric detectors are mounted on the first mounting surface, the receiving part and the output part are mounted on the second mounting surface, and a laser passing hole is provided between the first mounting surface and the second mounting surface, for guiding the laser beam from the laser to the receiving part, and after reflection by the reflection part, the laser beam is emitted from the output part to the photoelectric detector.

[0009] In some embodiments, the receiving part includes a first reflective sheet, which is mounted on the second mounting surface by a first support, corresponding to the laser emission end of the laser, for receiving the laser beam emitted by the laser and reflecting the laser beam to the reflection part.

[0010] In some embodiments, the output part includes a second reflective sheet, which is mounted on the second mounting surface by a second support, corresponding to the laser receiving end of the photoelectric detector, for receiving the laser beam reflected by the reflection part and emitting the laser beam to the photoelectric detector.

[0011] In some embodiments, the included angle of the first reflective sheet and the second reflective sheet with respect to the second mounting surface is 45°.

[0012] In some embodiments, the reflection part includes a plurality of third reflective sheets, and the inner wall of the base further forms a plurality of third mounting surfaces perpendicular to the second mounting surface, and the plurality of third reflective sheets are mounted on the third mounting surfaces, so that each receiving part reflects the laser beam through at least one third reflective sheet, thereby guiding the laser beam to the corresponding photoelectric detector.

[0013] In some embodiments, there are two receiving units and two output units, and four third reflectors are provided. One third reflector corresponds to one of the receiving units and one of the output units, so that the laser beam emitted by the receiving unit is reflected by one third reflector and then emitted to the corresponding output unit. The other three third reflectors are arranged opposite to each other, corresponding to another receiving unit and another output unit, so that the laser beam emitted by the receiving unit is reflected by the three reflectors and then emitted to the output unit.

[0014] In some embodiments, a plurality of optical path lines are further provided on the second mounting surface of the substrate, and the plurality of optical path lines correspond to the laser path.

[0015] In some embodiments, the multiplexed laser gas detection device further includes a housing structure, the housing structure including a reflector housing, a reflector front cover and a reflector rear cover, the reflector housing having openings at both ends, the substrate being installed inside the reflector housing, the reflector front cover being disposed at one end of the reflector housing near the gas detection area, the reflector front cover having a first filter hole for gas to enter the gas detection area through the first filter hole, and the reflector rear cover being disposed at the other end of the reflector housing.

[0016] In some embodiments, a filter screen is further provided between the front cover of the reflector and the gas detection area, the filter screen being used to filter the gas entering the gas detection area through the front cover of the reflector.

[0017] Compared with the prior art, the multiplexed laser gas detection device provided by this utility model has a base and a detection unit, and integrates the reflector group inside the gas detection area. Each receiving part and output part corresponds to the laser and photodetector, respectively, and the reflector part corresponds to each receiving part and output part, so as to form at least two laser paths inside the gas detection area, ensuring that the laser beam can be accurately reflected and guided to the corresponding photodetector. This design enables the device to meet the needs of various gas detection. Its structure is compact, the device size is small, it is easy to manufacture portable devices, and it is easy to integrate into other systems, making the whole device lighter, easier to carry and use. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the multiplexed laser gas detection device provided in this embodiment, showing the installation of the substrate, laser, photodetector, and reflector assembly.

[0019] Figure 2 This is a schematic diagram of the main view structure of the substrate of the multiplexed laser gas detection device provided in this embodiment of the utility model;

[0020] Figure 3This is a top view of the substrate structure of the multiplexed laser gas detection device provided in this embodiment of the utility model;

[0021] Figure 4 This is a three-dimensional structural diagram of the outer shell structure of the reusable laser gas detection device provided in this embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the overall main view cross-sectional structure of the reusable laser gas detection device provided in this embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the base of the multiplexed laser gas detection device provided in this embodiment of the utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Substrate; 11. First mounting surface; 12. Second mounting surface; 13. Third mounting surface; 14. Fourth surface;

[0026] 2. Laser; 3. Photodetector;

[0027] 4. Reflector assembly; 41. First reflector; 42. Second reflector; 431. First reflector; 432. Second reflector; 433. Third reflector; 434. Fourth reflector; 44. Reflector support;

[0028] 5. Outer shell structure; 51. Reflector outer shell; 52. Reflector front cover; 521. First filter hole; 53. Reflector rear cover; 54. Filter screen;

[0029] 6. Temperature sensor; 7. Pressure sensor. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] To address the technical problem that gas detection devices typically only detect a single gas, increasing costs and resulting in bulky and complex equipment, this invention provides a reusable laser gas detection device that can meet the needs of detecting multiple gases. It has a compact structure, small size, is easy to manufacture as a portable device, and is easy to integrate into other systems, making the entire device lighter, easier to carry and use.

[0032] Please see Figures 1 to 3The multiplexed laser gas detection device includes a substrate 1 and at least two sets of detection units. Inside the substrate 1, a gas detection zone is designed and formed to contain the gas to be detected. Each detection unit includes a laser 2, a photodetector 3, a receiver, a reflector, and an output unit. The laser 2 is connected and fixed to the substrate 1 and emits laser beams, which are used to detect the gas. Simultaneously, the photodetector 3 is also connected and fixed to the substrate 1 and receives the laser signal reflected from the gas detection zone. To achieve multipath laser detection, a receiver, a reflector, and an output unit together form a reflector group 4. The receiver and output unit correspond to the laser 2 and the photodetector 3, respectively, ensuring that the laser beam is accurately reflected and guided to the corresponding photodetector 3. The reflector corresponds to each receiver and output unit to form at least two laser paths within the gas detection zone, thereby reflecting the laser beam to the corresponding photodetector 3. This design not only improves the flexibility and accuracy of detection, but also makes the entire device lighter, easier to carry and use due to its compact structure.

[0033] In this device, a substrate 1 and a detection unit are provided, and a reflector group 4 is integrated inside the gas detection zone. Each receiving part and output part of the reflector group 4 corresponds to the laser 2 and the photodetector 3, respectively. The reflector corresponds to each receiving part and the output part, so as to form at least two laser paths inside the gas detection zone, ensuring that the laser beam can be accurately reflected and guided to the corresponding photodetector 3. This design enables the device to meet the needs of various gas detection. Its structure is compact, the device size is small, it is easy to manufacture portable devices, and it is easy to integrate into other systems, making the whole device lighter, easier to carry and use.

[0034] Please see Figures 1 to 3 In some possible embodiments, a first mounting surface 11 and a second mounting surface 12 are formed on both sides of the substrate 1, wherein the gas detection area is formed by a groove set inward on one side of the substrate 1, and the second mounting surface 12 is the bottom wall of the groove. The two lasers 2 and the two photodetectors 3 are all mounted on the first mounting surface 11, and the receiving part and the output part are all mounted on the second mounting surface 12. A laser through hole is provided between the first mounting surface 11 and the second mounting surface 12. The laser through hole is used to guide the laser beam from the laser 2 through to the receiving part, and after being reflected by the reflecting part, it is emitted from the output part to the photodetector 3.

[0035] In one possible embodiment, the receiving section includes a first reflector 41, which corresponds to the laser emitting end of the laser 2. Its main function is to receive the laser beam emitted by the laser 2 and reflect it to the reflecting section. The output section includes a second reflector 42, which corresponds to the laser receiving end of the photodetector 3. Its function is to receive the laser beam reflected back from the reflecting section and emit it to the photodetector 3.

[0036] It should be noted that the first reflector 41 and the second reflector 42 are respectively mounted on the second mounting surface 12 via the first support member and the second support member, and both maintain a 45° angle with the second mounting surface 12. Both the first and second support members are designed as reflective brackets, which are equipped with an adjustment mechanism during coupling, allowing for fine-tuning rotation on the second mounting surface and locking during use. This design enables the device to adjust the angles of the first reflector 41 and the second reflector 42 according to actual needs, ensuring that the laser beam can be accurately reflected and received.

[0037] In one possible embodiment, the reflective portion includes a plurality of third reflective plates, and the inner wall of the substrate 1 has a plurality of third mounting surfaces 13 perpendicular to the second mounting surface 12. These third reflective plates are respectively mounted on the third mounting surfaces 13, so that each receiving portion reflects the laser beam through at least one third reflective plate, thereby effectively guiding the laser beam to the corresponding photodetector 3. This design allows for precise control of the laser beam path, ensuring the accuracy and reliability of the entire system.

[0038] Preferably, in this embodiment, there are two receiving units, two reflecting units, and two output units. For ease of explanation, the three third reflective sheets are defined as the first sheet 431, the second sheet 432, the third sheet 433, and the fourth sheet 434. The first sheet 431, the second sheet 432, the third sheet 433, and the fourth sheet 434 are located on four third mounting surfaces 13 of the substrate 1. The four third mounting surfaces 13 are planar and arranged in an array along the center of the substrate 1. Adjacent third mounting surfaces 13 are connected by a fourth surface 14, which is an arc-shaped surface. The first sheet 431 independently constitutes the first reflecting unit. The laser beam emitted by the first laser 2 is redirected by the corresponding receiving unit to the first sheet 431 and reflected to the corresponding output unit. The laser beam is then reflected by the output unit to the first photoelectric sensor. Detector 3; the second reflector, consisting of a second reflector plate 432, a third reflector plate 433, and a fourth reflector plate 434, are arranged opposite each other. The laser beam emitted by the second laser 2 is redirected by the corresponding receiving part to the second reflector plate 432 for reception. The second reflector plate 432 reflects the laser beam to the third reflector plate 433, which then further reflects the reflected laser beam to the fourth reflector plate 434. The beam is then reflected by the fourth reflector plate 434 to the corresponding output part, and finally reflected by the corresponding output part to the second photodetector 3. This design ensures a more reasonable transmission path for the laser beam within the substrate 1, improving the accuracy and stability of the measurement. By designing the second reflector plate 432, the third reflector plate 433, and the fourth reflector plate 434, the optical path length can be increased. The optical path of the first optical path formed by these plates is longer than that of the second optical path, allowing for the selection of the appropriate optical path based on the required detection limit of the actual gas being detected. In certain types of gas analysis, especially when detecting extremely low concentrations of gases, increasing the optical path length (i.e., the distance the light beam travels through the gas sample) can significantly improve detection sensitivity. By introducing reflective mirrors, the light beam can be reflected multiple times within a compact space, thus increasing the optical path length without increasing the size of the equipment, thereby achieving a more efficient layout within a limited space.

[0039] In some possible embodiments, the second mounting surface 12 of the substrate 1 is further provided with a plurality of optical path scribes, which correspond to the laser path. The scribes are used to ensure the accurate relative positions between optical components. During installation or maintenance, the scribes can help operators quickly and accurately adjust the positions of each component to ensure the correct alignment of the optical path of the entire system.

[0040] Please see Figure 4 and Figure 5In some possible embodiments, the reusable laser gas detection device further includes a housing structure 5, which includes a reflector housing 51, a reflector front cover 52, a reflector rear cover 53, and a filter 54. The reflector housing 51 has openings at both ends, and the base 1 is installed inside the reflector housing 51. The reflector front cover 52 is located at one end of the reflector housing 51 near the gas detection area, and has several first filter holes 521 for gas to enter the gas detection area. The first filter holes 521 serve as gas inlets and provide coarse filtration. The reflector rear cover 53 is located at the other end of the reflector housing 51, and has a pre-drilled circular hole for circuit leads to pass through, and for subsequent sealing and potting compound to enter through this hole. The filter 54 is disposed between the front cover 52 of the reflector and the gas detection area. The filter 54 has a second filter hole, the diameter of which is smaller than that of the first filter hole 521. The second filter hole filters the gas entering the gas detection area through the front cover 52 of the reflector, effectively filtering / adsorbing impurities in the gas entering the reflector and protecting the lens within the reflector from contamination. This device, through its carefully designed housing structure 5 and the configuration of the filter 54, filters the gas entering the laser detection area, thereby effectively protecting the optical path of the laser detection area from contaminants in the external environment.

[0041] Please see Figure 5 and Figure 6 In some possible embodiments, a temperature sensor 6 and a pressure sensor 7 are also provided, both disposed inside the housing structure 5 and mounted on the base 1. The temperature sensor 6 senses temperature fluctuations within the gas detection zone and is used for temperature correction to ensure the accuracy of gas concentration measurement within the operating temperature range. The pressure sensor 7 monitors pressure changes within the gas detection zone, providing crucial parameters for accurate gas concentration calculation. Through the synergistic effect of these two sensors, the device can maintain stable detection performance under various environmental conditions.

[0042] It should be noted that this device has a very compact design, making it easy to integrate into other systems. For example, multiple substrates 1 can be designed and configured, and then these substrates 1 can be installed within a housing structure 5. Each substrate 1 is equipped with the ability to detect two different gases, thus enabling the entire device to detect a wider variety of gases. Furthermore, a substrate 1 can be nested within the housing structure 5 in a corresponding configuration, thereby creating multi-gas detection sensors with different encapsulation structures. This design not only increases the diversity of detection capabilities but also provides users with more choices and convenience.

[0043] This device integrates a substrate 1, a laser 2, a photodetector 3, and a reflector group 4 within the gas detection zone. Each receiving and output section of the reflector group 4 corresponds to the laser 2 and the photodetector 3, respectively, while the reflecting section corresponds to each receiving and output section. This creates at least two laser paths within the gas detection zone, ensuring that the laser beam is accurately reflected and guided to the corresponding photodetector 3. This design enables the device to meet the needs of various gas detection applications. Its compact structure and small size facilitate the manufacture of portable devices and integration into other systems, making the entire device lighter, easier to carry, and easier to use.

[0044] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0045] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A reusable laser gas detection device, characterized in that, include: The substrate, in which a gas detection zone is formed; as well as, At least two sets of detection units are provided, each set including a laser, a photodetector, a receiver, a reflector, and an output unit. The laser is connected to the substrate and is used to emit a laser beam. The photodetector is connected to the substrate and is used to receive the laser signal. The receiver and the output unit correspond to the laser and the photodetector, respectively, and the reflector corresponds to the receiver and the output unit, so as to form at least two laser paths inside the gas detection zone and reflect the laser beam to the corresponding photodetector.

2. The multiplexed laser gas detection device according to claim 1, characterized in that, The substrate has a first mounting surface and a second mounting surface on its two sides, respectively. The two lasers and the two photodetectors are mounted on the first mounting surface, and the receiving part and the output part are mounted on the second mounting surface. A laser through hole is provided between the first mounting surface and the second mounting surface. The laser through hole is used to guide the laser beam from the laser to the receiving part, and after being reflected by the reflecting part, it is emitted from the output part to the photodetector.

3. The multiplexed laser gas detection device according to claim 2, characterized in that, Each receiving unit includes a first reflective sheet, which is mounted on the second mounting surface via a first support member. The first reflective sheet corresponds to the laser emitting end of the laser and is used to receive the laser beam emitted by the laser and reflect the laser beam to the reflecting unit. The output section includes a second reflector, which is mounted on the second mounting surface via a second support member. The second reflector corresponds to the laser receiving end of the photodetector and is used to receive the laser beam reflected by the reflector and emit the laser beam to the photodetector.

4. The multiplexed laser gas detection device according to claim 3, characterized in that, The included angles formed by the first reflector and the second reflector relative to the second mounting surface are both 45°.

5. The multiplexed laser gas detection device according to claim 2, characterized in that, The reflective part includes a plurality of third reflective sheets, and the inner wall of the substrate is also formed with a plurality of third mounting surfaces perpendicular to the second mounting surface. The plurality of third reflective sheets are respectively mounted on the third mounting surfaces so that each receiving part reflects the laser beam through at least one third reflective sheet, thereby guiding the laser beam to the corresponding photodetector.

6. The multiplexed laser gas detection device according to claim 5, characterized in that, There are two receiving units and two output units. There are four third reflectors. One of the third reflectors corresponds to one of the receiving units and one of the output units, so that the laser beam emitted by the receiving unit is reflected by the third reflector and then emitted to the corresponding output unit. The other three third reflectors are arranged opposite to each other, corresponding to another receiving unit and another output unit, so that the laser beam emitted by the receiving unit is reflected by the three reflectors and then emitted to the output unit.

7. The multiplexed laser gas detection device according to claim 2, characterized in that, The second mounting surface of the substrate is also provided with several optical path lines, which correspond to the laser path.

8. The multiplexed laser gas detection device according to claim 1, characterized in that, It also includes a housing structure, which includes a reflector housing, a reflector front cover, and a reflector rear cover. The reflector housing has openings at both ends. The base is installed inside the reflector housing. The reflector front cover is located at one end of the reflector housing near the gas detection area. The reflector front cover has a first filter hole so that gas can enter the gas detection area through the first filter hole. The reflector rear cover is located at the other end of the reflector housing.

9. The multiplexed laser gas detection device according to claim 8, characterized in that, A filter screen is also provided between the front cover of the reflector and the gas detection area. The filter screen is used to filter the gas that enters the gas detection area through the front cover of the reflector.

10. The multiplexed laser gas detection device according to claim 8, characterized in that, It also includes a temperature sensor and a pressure sensor, both of which are located inside the housing structure.

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