Long optical path gas detection device
By introducing a long optical path reflection unit into the gas detection device, long optical path detection within a limited space is achieved, solving the problems of short optical path and low sensitivity of existing devices, and realizing long-distance gas detection and high-sensitivity measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN ACTECH MICROWAVE PHOTOELECTRON ENG RES CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-07
AI Technical Summary
Existing gas detection devices have short optical paths and low sensitivity, making it difficult to detect gases over long distances.
By employing a long optical path reflection unit, the laser is reflected multiple times within the device, and the long optical path reflection path composed of multiple mirrors is used to increase the optical path and improve sensitivity.
Achieving long optical path detection within a limited space improves the sensitivity of the gas detection device, enabling gas detection at a distance of 20 meters and reducing the impact of the external environment on the measurement.
Smart Images
Figure CN224471532U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas detection technology, and in particular to a long optical path gas detection device. Background Technology
[0002] A gas detection device is an instrument used to detect the concentration of a gas. It can detect the amount of a target gas in the air.
[0003] Currently, indoor gas detection devices consist of a laser, two reflectors, and a photodetector. The laser emits a beam of light, which is reflected twice before reaching the photodetector. The signal detected by the photodetector determines the gas concentration in the environment, thus achieving gas concentration measurement. However, current gas detection devices, due to the two reflections, have a short optical path, limiting detection to only a few centimeters or tens of centimeters, resulting in low sensitivity. Utility Model Content
[0004] This invention mainly addresses the technical problems of short optical path and low sensitivity in current gas detection devices. It proposes a long optical path gas detection device, which increases the optical path by multiple reflections through a long optical path reflection unit, thereby achieving long optical path detection within the limited space of the device and improving the device's sensitivity.
[0005] This utility model provides a long optical path gas detection device, including: an optical panel and a laser, a long optical path reflection unit, and a transmitting and receiving unit disposed on the optical panel;
[0006] The optical panel is covered by a housing; multiple air holes are left above one end of the optical panel;
[0007] The laser's emission direction is configured with a transmitting and receiving unit; the transmitting and receiving unit's emission direction is configured with a long optical path reflection unit; the long optical path reflection unit's emission direction faces the transmitting and receiving unit's receiving direction.
[0008] The transmitting and receiving unit includes: a collimator, a receiving lens, and a photodetector; the receiving lens is located directly below the collimator, and the photodetector is located directly behind the receiving lens; the collimator is connected to the output end of the laser.
[0009] The long optical path reflection unit includes: a first reflector, a second reflector, a third reflector, a fourth reflector, and a layered reflector;
[0010] The first reflector and the second reflector are mounted together, and the first reflector and the second reflector are at a 90° angle to each other;
[0011] The third reflector is positioned opposite the first reflector, and the fourth reflector is positioned opposite the second reflector. The third and fourth reflectors are installed together, and the third and fourth reflectors are at a 90° angle to each other.
[0012] The layered reflector is positioned next to the fourth reflector, and the layered reflector has a longitudinally arranged 90° reflection structure.
[0013] Preferably, the transmitting and receiving unit further includes: an adjustment base and an optical component mounting block;
[0014] The optical component mounting block is mounted on the adjustment base;
[0015] A collimator, a light-collecting lens, and a photodetector are mounted on the optical component mounting block; the collimator is connected to the laser's output end via an optical fiber connector and an optical fiber.
[0016] Preferably, the first reflector and the second reflector are mounted on the optical panel via a first reflector bracket;
[0017] The third and fourth reflectors are mounted on the optical panel via the second reflector bracket.
[0018] Preferably, a light-blocking plate is provided along the length of the optical panel; the light-blocking plate is located between the first reflector and the third reflector and does not contact the first reflector and the third reflector.
[0019] Preferably, a short reinforcing rib liner is provided at one end of the optical panel, the short reinforcing rib liner has multiple air holes, and a power interface is provided on the short reinforcing rib liner;
[0020] The housing provides space for vents and a power interface.
[0021] Preferably, an air pump and a filter are provided on the optical panel;
[0022] The air pump is connected to the filter, and the filter is connected to the air vent.
[0023] Preferably, a power supply is provided on the optical panel, and the power supply is electrically connected to a power interface.
[0024] Preferably, a central control panel is disposed above the optical panel; a display screen is disposed on the central control panel;
[0025] A display window is provided on the housing; the display window is located above the display screen.
[0026] Preferably, long reinforcing ribs are provided on both sides of the optical panel;
[0027] The long reinforcing rib liner is fixedly connected to the shell by screws.
[0028] Preferably, the adjustment seat is provided with an adjustment knob.
[0029] This invention provides a long-path gas detection device. A gas pump draws the gas to be tested into the device cavity through a gas inlet. A laser emitted from a laser is directed into a collimator, which collimates the laser before it is emitted onto a long-path reflector. After multiple reflections by the long-path reflector, the laser is transmitted to a receiving lens, which focuses the laser onto a photodetector. The photodetector converts the laser signal into an electrical signal, which is then sent to a central control board. The central control board processes the signal to obtain the test result, which is displayed on a screen. This invention increases the optical path by using a long-path reflector, resulting in an actual optical path far exceeding the device's dimensions. This allows for long-path detection within a limited space and provides a clear display of the test results, improving the device's sensitivity. This invention enables long-path measurements, saves space, is less affected by external environmental factors, and improves measurement accuracy. The device can detect gas at a distance of 20 meters, significantly extending the detection range. The optical component mounting block is installed on the movable end of the adjustment seat. The adjustment seat can adjust the pitch and yaw angle of the optical component mounting block to adjust the incident angle of the laser emitted by the collimator relative to the long optical path reflection unit, which facilitates optical path alignment. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the structure of the long optical path gas detection device provided by this utility model;
[0031] Figure 2 This is a schematic diagram of the overall internal structure of the long optical path gas detection device provided by this utility model;
[0032] Figure 3 This is a partial internal structure diagram of the long optical path gas detection device provided by this utility model;
[0033] Figure 4 This is a schematic diagram of the structure of the transmitting and receiving unit provided by this utility model;
[0034] Figure 5 This is a schematic diagram of the optical path of the long optical path reflection unit provided by this utility model.
[0035] Reference numerals: 1. Housing; 2. Display window; 3. Optical panel; 4. Air vent; 5. Transmitter / receiver unit; 6. Display screen; 7. Central control board; 8. Air pump; 9. Laser; 10. Filter; 11. First reflector; 12. Second reflector; 13. Third reflector; 14. Fourth reflector; 15. Power supply; 16. Power interface; 17. Light-blocking plate; 18. Long reinforcing rib liner; 19. Layered reflector; 20. Short reinforcing rib liner. Detailed Implementation
[0036] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this 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 for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0037] like Figure 1-3 As shown in the figure, the present invention provides a long optical path gas detection device, including: an optical panel 3 and a laser 9, a long optical path reflection unit, and a transmitting and receiving unit 5 disposed on the optical panel 3.
[0038] The optical panel 3 is covered by a housing 1; multiple air holes 4 are left above one end of the optical panel 3.
[0039] The laser 9 is positioned with a transmitting and receiving unit 5 in the emission direction; the transmitting and receiving unit 5 is positioned with a long optical path reflection unit in the emission direction; the emission direction of the long optical path reflection unit is oriented toward the receiving direction of the transmitting and receiving unit 5.
[0040] like Figure 4 As shown, the transmitting and receiving unit 5 includes: an adjustment base 501, an optical component mounting block 504, a collimator 503, a light-receiving lens 505, and a photodetector.
[0041] The optical component mounting block 504 is mounted on the adjustment seat 501; the adjustment seat 501 is equipped with an adjustment knob 506. A collimator 503, a light-collecting lens 505, and a photodetector are mounted on the optical component mounting block 504. The light-collecting lens 505 is located directly below the collimator 503, and the photodetector is located directly behind the light-collecting lens 505. The collimator 503 is connected to the output end of the laser 9; specifically, the collimator 503 is connected to the output end of the laser 9 via an optical fiber connector 502 and an optical fiber. The optical component mounting block 504 is mounted on the movable end of the adjustment seat 501. The adjustment seat 501 can adjust the pitch and yaw angles of the optical component mounting block 504, thereby adjusting the incident angle of the laser emitted by the collimator 503 relative to the long optical path reflection unit, facilitating optical path alignment.
[0042] By mounting the collimator 503, the light-collecting lens 505, and the photodetector on the optical component mounting block 504, and mounting the optical component mounting block 504 on the adjustable adjustment seat 501, the positions of the collimator 503, the light-collecting lens 505, and the photodetector can be adjusted, which facilitates the collimator 503 to emit laser and the light-collecting lens 505 to receive light signals.
[0043] The laser emitted by laser 9 enters collimator 503, which collimates the laser and then emits it onto long optical path reflection unit. The laser, after being reflected multiple times by long optical path reflection unit, is transmitted to light-collecting lens 505. Light-collecting lens 505 focuses the laser onto photodetector, which converts the laser signal into an electrical signal and then sends the electrical signal to central control board 7.
[0044] like Figure 2 and 5 As shown, the long optical path reflection unit includes: a first reflector 11, a second reflector 12, a third reflector 13, a fourth reflector 14, and a layered reflector 19; the first reflector 11 and the second reflector 12 are mounted together, and the first reflector 11 and the second reflector 12 are at a 90° angle to each other in the lateral direction; specifically, the first reflector 11 and the second reflector 12 are mounted on the optical panel 3 by means of a first reflector bracket.
[0045] The third reflector 13 is positioned opposite the first reflector 11, and the fourth reflector 14 is positioned opposite the second reflector 12. The third reflector 13 and the fourth reflector 14 are mounted together, and the third reflector 13 and the fourth reflector 14 are at a 90° angle to each other laterally. Specifically, the third reflector 13 and the fourth reflector 14 are mounted on the optical panel 3 via the second reflector bracket.
[0046] The layered reflector 19 is disposed next to the fourth reflector 14, and the layered reflector 19 has a longitudinally arranged 90° reflection structure.
[0047] A light-blocking plate 17 is provided along the length of the optical panel 3; the light-blocking plate 17 is located between the first reflector 11 and the third reflector 13, and does not contact the first reflector 11 and the third reflector 13. The light-blocking plate 17 can eliminate stray light.
[0048] The first reflector 11 and the second reflector 12 are not perfectly aligned with the third reflector 13 and the fourth reflector 14; they need to be staggered. The first reflector 11 cannot completely block the third reflector 13; it needs to leave room for the laser to be incident so that the laser emitted by the collimator 503 can directly hit the third reflector 13 and the light-receiving lens 505 can receive the laser reflected back from the third reflector 13. The fourth reflector 14 also cannot completely block the second reflector 12 and the layered reflector 19; it needs to leave room for the laser emitted by the layered reflector 19 so that the laser reflected by the layered reflector 19 can hit the second reflector 12.
[0049] The laser beam is emitted from the collimator 503 onto the third reflecting mirror 13, and after multiple reflections by the fourth reflecting mirror 14, the second reflecting mirror 12, the first reflecting mirror 11, and the layered reflecting mirror 19, it finally returns to the receiving lens 505. Through multiple reflections by the long-path reflection unit of this invention, the optical path is extended within a limited space, achieving long-path reflection. This enables long-distance gas detection, improves the sensitivity of the device, and allows for the detection of low-concentration gases.
[0050] Based on the above scheme, a short reinforcing rib liner 20 is provided at one end of the optical panel 3. The short reinforcing rib liner 20 has multiple air holes 4 and a power interface 16 is provided on the short reinforcing rib liner 20. The housing 1 provides space for the air holes 4 and the power interface 16.
[0051] An air pump 8 and a filter 10 are mounted on the optical panel 3. The air pump 8 is connected to the filter 10, and the filter 10 is connected to an air vent 4. The air vent 4 connects the inside of the device to the outside environment. The filter 10 uses a fiber filtration structure, which can effectively filter particulate matter and dust. The air pump 8 provides suction to draw the gas to be tested into the device. Multiple air vents 4 are provided, allowing for switching of the gas to be tested and for mixing multiple gases for testing. The air vent 4 can also be connected to the test environment through an air tube.
[0052] A central control board 7 is disposed above the optical panel 3; a display screen 6 is disposed on the central control board 7; a display window 2 is disposed on the housing 1; the display window 2 is located above the display screen 6. The central control board 7 can be a central control board of model AK322B001-A. A power supply 15 is disposed on the optical panel 3, and the power supply 15 is electrically connected to a power interface 16. When the power interface 16 is powered on, the power supply 15 provides power to the laser 9, photodetector, central control board 7, display screen 6, air pump 8 and other electronic control components.
[0053] The optical panel 3 is provided with long reinforcing rib plates 18 on both sides; the long reinforcing rib plates 18 are fixedly connected to the housing 1 by screws to ensure the structural stability of the device.
[0054] The working principle of the long optical path gas detection device provided by this utility model is as follows: The gas to be tested is drawn into the device cavity through the air pump 8 via the air hole 4 (unused holes are plugged with plugs to prevent leakage). The laser emitted by the laser 9 enters the collimator 503, which collimates the laser and then emits it onto the long optical path reflection unit. After multiple reflections by the long optical path reflection unit, the laser is transmitted to the light-receiving lens 505. The light-receiving lens 505 focuses the laser onto the photodetector. The photodetector converts the laser signal into an electrical signal, which is then sent to the central control board 7. The central control board 7 processes the signal to obtain the test result and displays it on the display screen 6. The laser's path can be folded multiple times by passing through the long optical path reflection unit, and the actual optical path far exceeds the size of the device itself, enabling longer-distance testing within a limited space and improving the device's sensitivity.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A long optical path gas detection device, characterized in that, include: Optical panel (3) and laser (9), long optical path reflection unit and transmitting and receiving unit (5) disposed on optical panel (3); The optical panel (3) is covered with a housing (1); multiple air holes (4) are left above one end of the optical panel (3); The laser (9) is provided with a transmitting and receiving unit (5) in the emission direction; the transmitting and receiving unit (5) is provided with a long optical path reflection unit in the emission direction; the emission direction of the long optical path reflection unit is oriented toward the receiving direction of the transmitting and receiving unit (5); The transmitting and receiving unit (5) includes: a collimator (503), a light-receiving lens (505), and a photodetector; the light-receiving lens (505) is located directly below the collimator (503), and the photodetector is located directly behind the light-receiving lens (505); the collimator (503) is connected to the output end of the laser (9). The long optical path reflection unit includes: a first reflector (11), a second reflector (12), a third reflector (13), a fourth reflector (14), and a layered reflector (19). The first reflector (11) and the second reflector (12) are mounted together, and the first reflector (11) and the second reflector (12) are at a 90° angle to each other; The third reflector (13) is located opposite the first reflector (11), and the fourth reflector (14) is located opposite the second reflector (12). The third reflector (13) and the fourth reflector (14) are installed together, and the third reflector (13) and the fourth reflector (14) are at a 90° angle to each other. The layered reflector (19) is located next to the fourth reflector (14), and the layered reflector (19) has a longitudinally arranged 90° reflection structure.
2. The long optical path gas detection device according to claim 1, characterized in that, The transmitting and receiving unit (5) further includes: an adjustment base (501) and an optical component mounting block (504); The optical component mounting block (504) is mounted on the adjustment seat (501); The collimator (503), the light-collecting lens (505), and the photodetector are mounted on the optical component mounting block (504); the collimator (503) is connected to the output end of the laser (9) through the fiber optic connector (502) and the optical fiber.
3. The long optical path gas detection device according to claim 1, characterized in that, The first reflector (11) and the second reflector (12) are mounted on the optical panel (3) via the first reflector bracket; The third reflector (13) and the fourth reflector (14) are mounted on the optical panel (3) via the second reflector bracket.
4. The long optical path gas detection device according to claim 3, characterized in that, A light-blocking plate (17) is provided along the length of the optical panel (3); the light-blocking plate (17) is located between the first reflector (11) and the third reflector (13) and does not contact the first reflector (11) and the third reflector (13).
5. The long optical path gas detection device according to claim 1, characterized in that, One end of the optical panel (3) is provided with a short reinforcing rib liner (20), the short reinforcing rib liner (20) has multiple air holes (4), and a power interface (16) is provided on the short reinforcing rib liner (20). The housing (1) avoids the positions of the air vent (4) and the power interface (16).
6. The long optical path gas detection device according to claim 5, characterized in that, An air pump (8) and a filter (10) are provided on the optical panel (3); The air pump (8) is connected to the filter (10), and the filter (10) is connected to the air hole (4).
7. The long optical path gas detection device according to claim 5, characterized in that, A power supply (15) is provided on the optical panel (3), and the power supply (15) is electrically connected to the power interface (16).
8. The long optical path gas detection device according to claim 1, characterized in that, A central control panel (7) is provided above the optical panel (3); a display screen (6) is provided on the central control panel (7); A display window (2) is provided on the housing (1); the display window (2) is located above the display screen (6).
9. The long optical path gas detection device according to claim 1, characterized in that, The optical panel (3) is provided with long reinforcing rib plates (18) on both sides respectively. The long reinforcing rib liner (18) is fixedly connected to the shell (1) by screws.
10. The long optical path gas detection device according to claim 2, characterized in that, An adjustment knob (506) is provided on the adjustment seat (501).