Optical particle counting sensor

Abstract

The application discloses an optical particle counting sensor, relates to the field of sensors, and comprises a shell, the inner wall of the bottom of the shell is provided with a detection assembly, the inner wall of the shell is provided with a PCB, and the outer wall of the shell is fixedly connected with a box cover, the outer wall of the shell is provided with a round opening, and the inner wall of the two round openings is fixedly connected with a connecting pipe. The application sets the detection assembly in the shell, and the cooperation between the flow cell and the two counting sensors arranged in the detection assembly, so that the detection precision of the counting sensor is improved. In addition, the light filter and the convex lens are arranged in the two mounting cavities to assist the two counting sensors in detection, so that the problem of low detection precision of the existing counting sensor is solved.

Description

Technical Field

[0001] This application relates to the field of sensors, and in particular to optical particle counting sensors. Background Technology

[0002] An optical particle counting sensor is a device used to detect and measure the concentration of particulate matter in the air, primarily based on the principle of laser scattering. This sensor works by irradiating airborne particles with a laser; the scattering signal from the particles is received by a photodetector and converted into an electrical signal. After amplification and processing, the number and size of the airborne particles can be calculated.

[0003] Existing optical particle counting sensors have low detection accuracy in practical use, which directly affects their application range. Summary of the Invention

[0004] To address the issue of low detection accuracy in existing optical particle counting sensors, this application provides an optical particle counting sensor.

[0005] The optical particle counting sensor provided in this application adopts the following technical solution: An optical particle counting sensor includes a housing, a detection component is provided on the bottom inner wall of the housing, a PCB board is mounted on the inner wall of the housing, and a cover is fixedly connected to the outer wall of the housing. Both outer walls of the housing have round openings, and connecting pipes are fixedly connected to the inner walls of the two round openings.

[0006] By adopting the above technical solution, the outer casing facilitates the installation and protection of the detection components, the PCB board facilitates the electrical control of the detection components, the cover facilitates the protection of the detection components and PCB board inside the casing, a sealing strip is provided between the cover and the outer casing, and the connecting pipe is provided for connection with the pipeline.

[0007] Preferably, the detection component includes a laser cavity formed on the inner wall of the bottom of the housing, and the inner wall of the bottom of the housing has a first mounting cavity and a second mounting cavity, both of which are connected to the laser cavity.

[0008] By adopting the above technical solution, the laser cavity and mounting cavity one are connected to mounting cavity two, which facilitates the installation of the detection component.

[0009] Preferably, a laser emitter is installed on the inner wall of the laser cavity, and a cylindrical mirror is installed on the bottom inner wall of the laser cavity, with the cylindrical mirror located in front of the laser emitter.

[0010] By adopting the above technical solution, a laser beam can be easily emitted from the laser cavity through the setting of the laser emitter, and the laser beam can be easily focused into a line or a fan-shaped area with the help of the cylindrical mirror.

[0011] Preferably, the inner walls on both sides of the laser cavity are fixedly connected to the same flow cell, and the flow cell is connected to two connecting pipes.

[0012] By adopting the above technical solution, the flow cell and two connecting pipes are connected, which facilitates the passage of particulate matter through the flow cell and the laser irradiates the flow cell.

[0013] Preferably, a filter is fixedly connected to the inner wall of the mounting cavity, and the filter has an L-shaped structure.

[0014] By adopting the above technical solution, the filter can remove unwanted spectral components or interfering light from the incident light.

[0015] Preferably, a convex lens is fixedly connected to the inner wall of the second mounting cavity, and the convex lens has a cylindrical structure.

[0016] By adopting the above technical solution, the convex lens has a magnifying effect, thereby improving the accuracy of detection.

[0017] Preferably, two counting sensors are welded to one side of the outer wall of the PCB board, and the two counting sensors are respectively inserted into mounting cavity one and mounting cavity two, and the PCB board is electrically connected to the laser emitter.

[0018] By adopting the above technical solution, laser can be received and detected by setting up two counting sensors, and the PCB board layout facilitates the control of the counting sensors.

[0019] Preferably, a groove is provided on one side of the outer wall of the outer shell, and an aircraft carrier head is fixedly connected to the inner wall of the groove.

[0020] By adopting the above technical solution, the data collected by the counting sensor can be easily transmitted through the aircraft carrier's bow.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. This application improves the detection accuracy of the counting sensors by setting a detection component in the housing, and the cooperation between the flow cell and the two counting sensors set in the detection component. Furthermore, the application solves the problem of low detection accuracy of existing counting sensors by distributing filter plates and convex lenses in the two mounting cavities to assist the detection of the two counting sensors. 2. This application improves the accuracy of the optical particle counting sensor by incorporating a cylindrical mirror in the housing. The cylindrical mirror is an aspherical lens, which can effectively reduce spherical aberration and chromatic aberration, thereby avoiding interference with the laser's irradiation of the flow cell. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall structure of the optical particle counting sensor according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the internal structure of the outer casing, representing a key embodiment of this application. Figure 3 This is a schematic diagram illustrating the main structure of the detection component in the embodiments of this application; Figure 4 This is a schematic diagram of the internal structure of the optical particle counting sensor according to an embodiment of this application; Reference numerals: 1. Outer shell; 2. Box cover; 3. Aircraft carrier head; 4. Connecting pipe; 5. PCB board; 6. Counting sensor; 7. Detection component; 8. Laser cavity; 9. Mounting cavity one; 10. Mounting cavity two; 11. Laser emitter; 12. Cylindrical mirror; 13. Flow cell; 14. Convex lens; 15. Filter. Detailed Implementation

[0023] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0024] This application discloses an optical particle counting sensor.

[0025] Reference Figure 1-4 The optical particle counting sensor includes a housing 1, a detection component 7 is provided on the inner wall of the bottom of the housing 1, a PCB board 5 is installed on the inner wall of the housing 1, the PCB board 5 is located on one side of the detection component 7, and the back plate of the PCB board 5 faces the detection component 7, which effectively avoids the light source on the PCB board 5 from affecting the normal detection of the detection component 7. The outer wall of the housing 1 is fixedly connected to a cover 2, and both outer walls of the housing 1 have round openings, and the inner walls of the two round openings are fixedly connected to connecting pipes 4.

[0026] In use, the outer casing 1 facilitates the installation and protection of the detection component 7, the PCB board 5 facilitates the electrical control of the detection component 7, the cover 2 facilitates the protection of the detection component 7 and the PCB board 5 in the outer casing 1, a sealing strip is provided between the cover 2 and the outer casing 1, and the connecting pipe 4 is provided to connect to the pipeline.

[0027] Reference Figure 1-4The detection component 7 installed in the housing 1 includes a laser cavity 8 formed on the inner wall of the bottom of the housing 1. A first mounting cavity 9 and a second mounting cavity 10 are respectively formed on the inner wall of the bottom of the housing 1, both of which are connected to the laser cavity 8. A laser emitter 11 is installed on the inner wall of the laser cavity 8, and a cylindrical mirror 12 is installed on the inner wall of the bottom of the laser cavity 8, located in front of the laser emitter 11. The same flow cell 13 is fixedly connected to the inner walls of both sides of the laser cavity 8, and the flow cell 13 is connected to two connecting pipes 4. The laser cavity 8 and the first mounting cavity 9 are connected to the laser cavity 8. The mounting cavity 10 is connected to facilitate the installation of the detection components. The laser emitter 11 is set to emit a laser beam in the laser cavity 8. With the help of the cylindrical mirror 12, the laser beam can be focused into a line or a fan-shaped area. The flow cell 13 is connected to the two connecting pipes 4, which facilitates the passage of particles through the flow cell 13. The laser shines on the flow cell 13. After being blocked by the particles in the flow cell 13, the scattering signal of the laser by the particles is received by the photodetector and converted into an electrical signal. After amplification and processing, the number and size of the particles in the air can be calculated.

[0028] Reference Figure 2-4 A filter 15 is fixedly connected to the inner wall of mounting cavity 10, and the filter 15 has an L-shaped structure. A convex lens 14 is fixedly connected to the inner wall of mounting cavity 2, and the convex lens 14 has a cylindrical structure. The filter 15 can filter out unwanted spectral components or interfering light in the incident light. The convex lens 14 has a magnification effect, thereby improving the accuracy of detection.

[0029] Reference Figure 2-4 Two counting sensors 6 are soldered to one side of the outer wall of the PCB board 5 installed in the housing 1. The two counting sensors 6 are respectively inserted into the mounting cavity 9 and the mounting cavity 10. The PCB board 5 is electrically connected to the laser emitter 11. A groove is opened on one side of the outer wall of the housing 1, and the aircraft carrier head 3 is fixedly connected to the inner wall of the groove. The laser can be received and detected by the two counting sensors 6. The setting of the PCB board 5 facilitates the control of the counting sensors 6, and the setting of the aircraft carrier head 3 facilitates the transmission of the data collected by the counting sensors 6.

[0030] The implementation principle of the optical particle counting sensor in this application embodiment is as follows: In use, the connecting hose is connected to the two connecting tubes 4 respectively. When the particles enter the flow cell 13 through the connecting tubes 4, the PCB board 5 controls the laser emitter 11 to start. The laser emitter 11 emits a laser beam that passes through the cylindrical mirror 12. The cylindrical mirror 12 can focus the laser beam into a line or fan-shaped area and then irradiate the flow cell 13. After passing through the flow cell 13, the laser beam is blocked by the particles in the flow cell 13 and then passes through the filter 15 and the convex lens 14 respectively to irradiate the two counting sensors 6, thereby counting the optical particles.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An optical particle counting sensor, comprising a housing (1), characterized in that: The bottom inner wall of the outer shell (1) is provided with a detection component (7), the inner wall of the outer shell (1) is equipped with a PCB board (5), and the outer wall of the outer shell (1) is fixedly connected with a box cover (2). Both outer walls of the outer shell (1) are provided with round openings, and the inner walls of the two round openings are fixedly connected with connecting pipes (4).

2. The optical particle counting sensor according to claim 1, characterized in that: The detection component (7) includes a laser cavity (8) opened on the bottom inner wall of the outer shell (1). The bottom inner wall of the outer shell (1) is provided with a first mounting cavity (9) and a second mounting cavity (10), which are connected to the laser cavity (8).

3. The optical particle counting sensor according to claim 2, characterized in that: A laser emitter (11) is installed on the inner wall of the laser cavity (8), and a cylindrical mirror (12) is installed on the bottom inner wall of the laser cavity (8), with the cylindrical mirror (12) located in front of the laser emitter (11).

4. The optical particle counting sensor according to claim 3, characterized in that: The laser cavity (8) has two inner walls fixedly connected to the same flow cell (13), and the flow cell (13) is connected to two connecting pipes (4).

5. The optical particle counting sensor according to claim 4, characterized in that: A filter (15) is fixedly connected to the inner wall of the mounting cavity (9), and the filter (15) has an L-shaped structure.

6. The optical particle counting sensor according to claim 5, characterized in that: A convex lens (14) is fixedly connected to the inner wall of the second mounting cavity (10), and the convex lens (14) is a cylindrical structure.

7. The optical particle counting sensor according to claim 6, characterized in that: Two counting sensors (6) are welded to one side of the outer wall of the PCB board (5), and the two counting sensors (6) are respectively inserted into the first mounting cavity (9) and the second mounting cavity (10). The PCB board (5) is electrically connected to the laser emitter (11).

8. The optical particle counting sensor according to claim 7, characterized in that: A groove is provided on one side of the outer wall of the outer shell (1), and the inner wall of the groove is fixedly connected to the aircraft carrier head (3).

Images