Laser methane sensor supporting secondary development

Abstract

The utility model provides a laser methane sensor supporting secondary development, which comprises an optical component collimation fixing structure, a gas chamber groove is arranged in the middle of the optical component collimation fixing structure, and a laser emission component and a laser detection component are respectively fixed at two ends of the optical component collimation fixing structure. The gas chamber groove is respectively communicated with the laser emission assembly and the laser detection assembly, and the laser emission assembly corresponds to the laser detection assembly; an expandable detection circuit board is fixed to the lower portion of the optical assembly collimation fixing structure, the laser emitting assembly and the laser detection assembly are both connected with the expandable detection circuit board, and a development interface is arranged on the side portion of the expandable detection circuit board. The utility model has the advantages of high precision, high stability, easy integration and the like, and can meet the requirements of different application scenes; by providing an open development interface and utilizing the expandable detection circuit board, secondary development is facilitated, greater flexibility and expansibility are provided for users, and wide application of the laser methane sensor in the fields of industry, environmental protection and the like is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a laser methane sensor supporting secondary development. Background Art

[0002] With the continuous development of the industrial and environmental sectors, the demand for monitoring and detecting methane, a greenhouse and combustible gas, is growing. Traditional gas sensors, based on their operating principles, mainly include electrochemical sensors, catalytic combustion sensors, and semiconductor sensors. Traditional methane sensors suffer from poor selectivity, low measurement accuracy, low sensitivity, poor stability, and difficulty in integration. Electrochemical sensors are low-cost and simple in structure, but they are sensitive to the environment, have a limited service life, and are susceptible to interference from other gases. Catalytic combustion sensors have a fast response speed but are sensitive to oxygen concentration, posing a safety hazard. Semiconductor sensors are significantly affected by temperature and humidity and have poor long-term stability. Laser methane sensors, as a new type of gas detection product, offer advantages such as high accuracy, high stability, and fast response speed. However, existing laser methane sensors are not fully considered in their design for secondary development. Their hardware interfaces are relatively fixed, and their communication protocols use proprietary or closed standards. They are generally not redevelopable, resulting in limited flexibility, fixed functions and usage, and an inability to adjust or optimize them to meet specific user needs, limiting their application in specific scenarios.

[0003] With the continuous advancement of technology and the continuous changes in application scenarios, users may need to add new functions to sensors or improve existing functions. Sensors that do not support secondary development cannot easily achieve these extensions, which limits their future development potential and the expansion of application scenarios. In many application scenarios, laser methane sensors need to be integrated with other devices or systems. If the sensor does not support secondary development, then integration with other systems may become very difficult or even impossible, which will not only increase the complexity and cost of the system, but may also affect the performance and stability of the entire system. In some industries, users may need to customize the sensor to meet specific business needs. Sensors that do not support secondary development cannot meet these customization needs, which limits the application and promotion of sensors in specific industries.

[0004] Utility model patent application number 202222426456.7 discloses a through-beam laser methane detection module, comprising: a housing, a laser mounted on the housing, an aperture, a photodetector, and a control circuit board. The housing has an open air chamber connected to the outside world; the laser, aperture, and photodetector are arranged in a straight line within the open air chamber, spaced apart in sequence; and a control circuit board mounted on the housing. The control circuit board is electrically connected to the laser and photodetector to control the laser's laser emission and receive the detection signal generated by the photodetector. The through-beam laser methane detection module in this utility model embodiment allows methane to diffuse from the outside into the open air chamber for detection. It has a simple structure, eliminates the need for pumping to collect methane, and consumes low power. During detection, the laser emits laser light, which passes through the aperture and enters the photodetector for detection. The final methane concentration is then demodulated by the control circuit board. The aperture eliminates reflected laser light from the end face of the photodetector, resulting in strong anti-interference capabilities and a low false alarm rate. However, the above patent does not support secondary development, which may lead to problems such as limited flexibility, poor scalability, difficulty in integration, poor long-term adaptability, and difficulty meeting customization requirements. These problems may affect the performance and usage of sensors, and limit their application and development in different scenarios. Utility Model Content

[0005] In response to the technical problem that existing laser methane sensors generally do not have secondary development capabilities, the utility model proposes a laser methane sensor that supports secondary development. It adopts TDLAS laser detection technology and has the characteristics of high precision, high stability, and easy integration. It can be customized and expanded through the development interface to meet the needs of different application scenarios.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is implemented as follows: a laser methane sensor supporting secondary development includes an optical component collimation and fixing structure, an air chamber groove is provided in the middle of the optical component collimation and fixing structure, a laser emitting component and a laser detection component are fixed at both ends of the optical component collimation and fixing structure, the air chamber grooves are respectively connected to the laser emitting component and the laser detection component, and the laser emitting component and the laser detection component correspond to each other; an expandable detection circuit board is fixed at the lower part of the optical component collimation and fixing structure, the laser emitting component and the laser detection component are both connected to the expandable detection circuit board, and a development interface is provided on the side of the expandable detection circuit board.

[0007] Preferably, the optical component alignment and fixing structure includes a shell, both ends of the shell are provided with accommodating grooves, and the laser emitting component and the laser detecting component are respectively arranged in the two accommodating grooves relative to each other.

[0008] Preferably, the laser emitting component includes a laser and a laser circuit board, the laser is fixed on the laser circuit board, and the laser circuit board is fixed in a receiving slot; the laser detection component includes a detector and a detector circuit board, the detector is fixed on the detector circuit board, and the detector circuit board is fixed in another receiving slot; the laser circuit board and the detector circuit board are both connected to the control circuit in the center of the expandable detection circuit board.

[0009] Preferably, the laser and the detector are respectively arranged on both sides of the gas chamber groove, and the centers of the laser and the detector are on the same straight line.

[0010] Preferably, the lower parts of the laser circuit board and the detector circuit board are both provided with protrusions, and both ends of the expandable detection circuit board are both provided with first slots, and the protrusions match the first slots.

[0011] Preferably, positioning posts are provided around the lower portion of the shell, and a second slot is provided around the expandable detection circuit board, and the positioning posts match the second slot.

[0012] Preferably, a third groove is provided at the lower portion of the shell, and the third groove and the middle portion of the expandable detection circuit board form a closed space.

[0013] Preferably, first grooves are provided on both sides of the bottom side of the shell, and the development interface is arranged on the expandable detection circuit board at the corresponding position of the first groove.

[0014] Preferably, the development interface is a stamp hole, which is connected to the control circuit in the center of the expandable detection circuit board.

[0015] Preferably, the stamp hole includes a socket and a card hole, the card hole is arranged on both sides of the expandable detection circuit board, and the socket is arranged on the inner side of the card hole; the socket and the card hole are both connected to the control circuit in the center of the expandable detection circuit board.

[0016] Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention provides a laser methane sensor that supports secondary development, has the advantages of high precision, high stability, and easy integration, and can meet the needs of different application scenarios; by providing an open development interface and utilizing an expandable detection circuit board to facilitate secondary development, it provides users with greater flexibility and scalability, and helps promote the widespread application of laser methane sensors in the fields of industry, environmental protection, etc. The present invention has the following features:

[0017] High-precision measurement: Using TDLAS laser detection technology, the laser emits a laser beam of a specific wavelength. When there are detection gas molecules in the gas chamber, the laser beam energy will be absorbed by the gas molecules after passing through the gas chamber, causing the laser beam intensity to weaken. By analyzing the intensity change of the laser beam, high-precision methane concentration measurement can be achieved;

[0018] High stability: It uses the specific infrared absorption peak of methane (1.65um). This band has strong absorption only for methane and has good anti-interference ability. It is not affected by ambient gas and other gases through the direct optical path and has good moisture resistance.

[0019] Easy to integrate: Adopt standardized physical interfaces and widely used communication protocols, standardized data formats and clearly defined data structures, and ensure integration with other systems through open and compatible software and hardware.

[0020] Support secondary development: The expandable detection circuit board provides open hardware and software interfaces, allowing users to customize and expand according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 This is an exploded view of Example 1 of the present utility model.

[0024] Figure 3 This is an exploded view of Example 2 of the present utility model.

[0025] In the figure, 1 is the optical component alignment and fixing structure, 2 is the laser emission component, 3 is the laser detection component, 4 is the expandable detection circuit board, 5 is the development interface, 11 is the accommodating groove, 12 is the air chamber groove, 13 is the first groove, 14 is the positioning column, 15 is the shell, 16 is the bump, 21 is the laser, 22 is the laser circuit board, 31 is the detector, 32 is the detector circuit board, 41 is the first slot, 42 is the second slot, 51 is the socket, and 52 is the card hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a laser methane sensor that supports secondary development includes an optical component collimating and fixing structure 1, wherein an air chamber groove 12 is provided in the middle of the optical component collimating and fixing structure 1. The air chamber groove 12 provides an open optical path, and the single-sided opening is more conducive to the stable operation of key components and plays a protective role. A laser emitting component 2 and a laser detection component 3 are fixed to both ends of the optical component collimating and fixing structure 1. The laser emitting component 2 is arranged at the emitting end of the optical component collimating and fixing structure 1, and is used to emit a laser beam passing through the air chamber groove 12. The laser detection component 3 is arranged at the detection end of the optical component collimating and fixing structure 1, and is used to receive the laser beam passing through the air chamber groove 12. The laser emitting component 2 is used to emit a detection laser, and the laser detection component 3 is used to collect the laser after passing through the air chamber. The air chamber groove 12 is respectively connected to the laser emitting component 2 and the laser detection component 3, so that the detection laser passing through the air chamber groove 12 can be collected by the laser detection component 3. The laser emitting component 2 and the laser detection component 3 correspond to each other, ensuring that the laser detection component 3 can detect the detection laser emitted by the laser emitting component 2; an expandable detection circuit board 4 is fixed to the lower part of the optical component collimation and fixing structure 1, and the laser emitting component 2 and the laser detection component 3 are both connected to the expandable detection circuit board 4. Development interfaces 5 are provided on both sides of the expandable detection circuit board 4. The expandable detection circuit board 4 is an expandable detection circuit board that supports secondary development. It is used to drive and control the normal operation of the laser emitting component 2 and process the signals received by the laser detection component 3, and analyze, calculate and convert the received signals into specific methane concentration data. The expandable detection circuit board 4 is in close contact with the optical component collimation and fixing structure 1 to ensure the reliability of the entire device. The development interface 5 is prefabricated on the expandable detection circuit board 4 and is connected to the signal processing circuit on the expandable detection circuit board 4. The development interface 5 provides hardware and software interfaces to support users in secondary development.

[0029] The laser emitting assembly 2 emits a laser beam of a specific wavelength, which is absorbed by the methane gas in the gas chamber groove 12 and then received by the laser detection assembly 3. The laser detection assembly 3 converts the received laser signal into an electrical signal and transmits it to the signal processor of the expandable detection circuit board 4. The signal processor processes the electrical signal and calculates the methane concentration data. Users can perform secondary development through the development interface 5 to achieve personalized functions.

[0030] like Figure 2 As shown, the optical component alignment and fixing structure 1 includes a shell 15. The shell 15 is in the shape of a rectangular parallelepiped as a whole. A receiving groove 11 is provided at both ends of the shell 15. The receiving groove 11 is opened in the left and right directions of the shell 15. The laser emitting component 2 and the laser detection component 3 are respectively arranged in the two receiving grooves 11 relative to each other. The receiving groove 11 is a positioning and fixing groove for the laser emitting component 2 and the laser detection component 3, which is convenient for fixing the laser emitting component 2 and the laser detection component 3 on both sides of the air chamber groove 12, thereby facilitating the collection of the spectral signal of the methane gas passing through the air chamber groove 12. The lower part of the receiving groove 11 is open, which is convenient for connection with the expandable detection circuit board 4. After installation, the shallow groove formed by the receiving groove 11 and the expandable detection circuit board 4 can protect the laser emitting component 2 and the laser detection component 3 by glue filling.

[0031] The laser emitting assembly 2 includes a laser 21 and a laser circuit board 22. The laser circuit board 22 is provided with a perforation that is consistent with the laser pin. The laser 21 is fixed to the laser circuit board 22 by welding after perforation. The length and width of the laser circuit board 22 are consistent with the receiving slot 11. The laser circuit board 22 is fixed in one receiving slot 11 by screws. The laser detection assembly 3 includes a detector 31 and a detector circuit board 32. The detector 31 is fixed to the laser circuit board 22 by welding after perforation. The size of the laser circuit board 22 is consistent with the receiving slot 11. The laser circuit board 22 is fixed in another receiving slot 11 by screws. The laser circuit board 22 and the detector circuit board 32 are both connected to the signal processing circuit in the center of the expandable detection circuit board 4 through electrode pins. The laser 21 and detector 31 use TDLAS technology. The laser and detector are TO-encapsulated light-emitting and detection optical devices corresponding to the specific infrared absorption band of methane, respectively.

[0032] The laser 21 and detector 31 are respectively arranged on both sides of the air chamber groove 12, and the centers of the laser 21 and the detector 31 are on the same straight line. Through holes and screw holes are provided on both sides of the air chamber groove 12. The air chamber groove 12 is connected to the two receiving grooves 11 through the through holes to form a passage. The laser 21 and the detector 31 are respectively arranged in the two through holes. The two through holes are arranged relative to each other to position and fix the laser 21 and the detector 31, so that the emission and reception of the detection laser can be carried out smoothly. The screws are connected to the screw holes to fix the laser circuit board 22 and the detector circuit board 32. After fixing the laser circuit board 22 and the detector circuit board 32, the laser 21 and the detector 31 are aligned to achieve optical path collimation.

[0033] The lower parts of the laser circuit board 22 and the detector circuit board 32 are both provided with a protrusion 16, and both ends of the expandable detection circuit board 4 are provided with a first slot 41. The protrusion 16 matches the first slot 41, and the protrusion 16 cooperates with the first slot 41 to achieve snap-on connection. On the one hand, it can achieve close contact between the expandable detection circuit board 4 and the shell 15, and on the other hand, it can also achieve contact between the laser circuit board 22 and the detector circuit board 32 and the electrodes on the first slot 41. Subsequently, the electrodes can be welded to the pins on the laser circuit board 22 and the detector circuit board 32, so that the signal processing circuit on the expandable detection circuit board 4 can be connected to the laser 21 and the detector 31 through the laser circuit board 22 and the detector circuit board 32 respectively, thereby realizing the transmission of control instructions and data.

[0034] A third groove is provided at the bottom of the housing 15. The third groove and the middle of the expandable detection circuit board 4 form a closed space to prevent the electronic components on the expandable detection circuit board 4 from being exposed, thereby protecting the electronic components. The expandable detection circuit board 4 is a rectangular circuit board, the center of which is welded with the electronic components of the signal processing circuit. First slots 41 are provided at the left and right ends of the rectangular circuit board. The first slots 41 are long strip-shaped through holes that pass through from top to bottom, and their dimensions are consistent with those of the bumps 16. The expandable detection circuit board 4 controls the normal operation of the laser emission component through the signal processing circuit drive, processes the signals received by the laser detection component, analyzes and calculates the detector signals, and converts the signals into specific methane concentration data. In addition to meeting the above basic functions, the free and callable single-chip microcomputer interface in the signal processing circuit is brought out through the development interface 5. The development interface 5 can realize program modification and personalized function development and customization. The signal processing circuit includes a single-chip microcomputer, the model of which is HC32L190.

[0035] The housing 15 has first grooves 13 on both sides of its bottom side, and the development interface 5 is arranged on the expandable detection circuit board 4 at positions corresponding to the first grooves 13. The first grooves 13 are used to increase space for the development interface 5 after installation.

[0036] The development interface 5 is a stamp hole, which is connected to the signal processing circuit in the center of the expandable detection circuit board 4

[0037] like Figure 1 As shown, the stamp hole includes a socket 51 and a card hole 52, and the socket 51 and the card hole 52 are both arranged on both sides of the expandable detection circuit board 4, and the socket 51 is arranged on the inner side of the card hole 52; it can adapt to a variety of usage scenarios, not only can it be connected to the extension by the card hole card connection method, but it can also be connected by maintaining a certain distance between the socket and the extension. The two different methods are used mainly to consider whether they can meet different expansion requirements. The socket 51 and the card hole 52 are both connected to the signal processing circuit in the center of the expandable detection circuit board 4. The socket 51 and the card hole 52 are respectively arranged in two columns at the front and back, and are both connected to the available interface of the microcontroller through the patch circuit on the expandable detection circuit board 4. The stamp hole is a secondary development interface. It is based on the native sensor hardware, through the deep integration and expansion of software and hardware, to give the sensor more rich functions, improve sensor performance, and enable it to better meet the needs of specific application scenarios.

[0038] The functions of development interface 5 include:

[0039] 1. The physical connection function between the sensor and external devices (such as microcontrollers, computers, etc.) provides a reliable basis for data transmission through stable physical connections.

[0040] 2. Developers can use the interactive function between programming languages ​​and sensors to achieve efficient communication between developers and sensors, making sensor operation more flexible and convenient.

[0041] 3. Realize the functions of sensor data collection, conversion, storage and transmission through the development interface.

[0042] 4. Other personalized function expansions can be achieved through the development interface, including but not limited to sensor status detection, alarm triggering, solenoid valve control, light indication, relay control, wireless transmission, numerical value recording, numerical value display, and sensor remote monitoring and control functions.

[0043] Through standardized development interfaces and development tools, the threshold for secondary development is lowered, allowing users to customize sensor functions according to their needs, improving the flexibility and adaptability of the system. Through program optimization and function expansion, the practicality and reliability of the sensor are improved, providing strong technical support for various application scenarios.

[0044] The overall installation method of the present invention is: first, the laser 21 and the detector 31 are welded to the laser circuit board 22 and the detector circuit board 32 respectively; then, the laser circuit board 22 and the detector circuit board 32 are fixed to the two sides of the air chamber groove 12 by two screws respectively; the optical component collimation fixing structure 1, the laser emission component 2 and the laser detection component 3 are inserted into the expandable detection circuit board 4 as a whole, and the specific insertion method is: the protrusions 16 under the laser circuit board 22 and the detector circuit board 32 are matched with the first slots 41 running through the left and right ends of the expandable detection circuit board 4 to achieve positioning; finally, the soldering pads on the laser circuit board 22 and the detector circuit board 32 are soldered and fixed to the soldering pads on the expandable detection circuit board 4, and the electrode pins are connected by the soldering pads to realize the electrical connection between the laser circuit board 22 and the detector circuit board 32 and the expandable detection circuit board 4 respectively, so that the laser and the detector can be controlled and data collected.

[0045] Example 2

[0046] like Figure 3 As shown, a laser methane sensor that supports secondary development, wherein at least three positioning posts 14 are provided around the lower part of the shell 15, and a second slot 42 is provided around the expandable detection circuit board 4, and the positioning posts 14 and the second slot 42 match. The positioning post 14 is inserted into the second slot 42 and is used for positioning when the shell 15 and the expandable detection circuit board 4 are matched. In this embodiment, the left corners and the right front corner of the expandable detection circuit board 4 are provided with a second slot 42, and the second slot 42 is a through hole that passes through from top to bottom, and the through hole is consistent in size with the positioning post 14. The insertion method is: positioning is achieved by matching the three positioning posts 14 under the shell 15 with the three second slots 42 on the component 4.

[0047] The other structures are the same as those in Example 1.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser methane sensor supporting secondary development, comprising an optical component alignment and fixing structure (1), characterized in that: An air chamber groove (12) is provided in the middle of the optical component collimating fixing structure (1), and a laser emitting component (2) and a laser detection component (3) are fixed at both ends of the optical component collimating fixing structure (1), and the air chamber groove (12) is respectively connected to the laser emitting component (2) and the laser detection component (3), and the laser emitting component (2) and the laser detection component (3) correspond to each other; an expandable detection circuit board (4) is fixed at the lower part of the optical component collimating fixing structure (1), and the laser emitting component (2) and the laser detection component (3) are both connected to the expandable detection circuit board (4), and a development interface (5) is provided on the side of the expandable detection circuit board (4).

2. The laser methane sensor supporting secondary development according to claim 1, characterized in that: The optical component alignment and fixing structure (1) comprises a housing (15), both ends of the housing (15) are provided with accommodating grooves (11), and the laser emitting component (2) and the laser detecting component (3) are respectively arranged in the two accommodating grooves (11) relative to each other.

3. The laser methane sensor supporting secondary development according to claim 2, characterized in that: The laser emission assembly (2) includes a laser (21) and a laser circuit board (22), wherein the laser (21) is fixed on the laser circuit board (22), and the laser circuit board (22) is fixed in a receiving groove (11); the laser detection assembly (3) includes a detector (31) and a detector circuit board (32), wherein the detector (31) is fixed on the detector circuit board (32), and the detector circuit board (32) is fixed in another receiving groove (11); the laser circuit board (22) and the detector circuit board (32) are both connected to the control circuit in the center of the expandable detection circuit board (4).

4. The laser methane sensor supporting secondary development according to claim 3 is characterized in that: The laser (21) and the detector (31) are respectively arranged on both sides of the air chamber groove (12), and the centers of the laser (21) and the detector (31) are on the same straight line.

5. The laser methane sensor supporting secondary development according to claim 3 is characterized in that: The lower parts of the laser circuit board (22) and the detector circuit board (32) are both provided with protrusions, and both ends of the expandable detection circuit board (4) are both provided with first slots (41), and the protrusions match the first slots (41).

6. The laser methane sensor supporting secondary development according to claim 3 is characterized in that: Positioning columns (14) are provided around the lower portion of the shell (15), and second slots (42) are provided around the expandable detection circuit board (4), and the positioning columns (14) and the second slots (42) match.

7. The laser methane sensor supporting secondary development according to claim 5 or 6, characterized in that: A third groove is provided at the lower portion of the housing (15), and the third groove and the middle portion of the expandable detection circuit board (4) form a closed space.

8. The laser methane sensor supporting secondary development according to claim 7, characterized in that: Both sides of the bottom side of the housing (15) are provided with first grooves (13), and the development interface (5) is arranged on the expandable detection circuit board (4) at a position corresponding to the first groove (13).

9. The laser methane sensor supporting secondary development according to claim 8, characterized in that: The development interface (5) is a stamp hole, which is connected to the control circuit in the center of the expandable detection circuit board (4).

10. The laser methane sensor supporting secondary development according to claim 9, characterized in that: The stamp hole comprises a socket (51) and a card hole (52), wherein the card hole (52) is arranged on both sides of the expandable detection circuit board (4), and the socket (51) is arranged on the inner side of the card hole (52); the socket (51) and the card hole (52) are both connected to the control circuit in the center of the expandable detection circuit board (4).

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