A full-angle laser combustible gas remote measuring device and detection method

Abstract

The application provides a full-angle laser combustible gas remote measuring device and a detection method, and relates to the technical field of combustible gas detection. The device comprises a remote measuring instrument body, a laser emitter, a lens group, a detector and an aperture assembly. The lens group reciprocally moves along the light transmission direction to adjust the waist position of the outgoing laser beam. The aperture assembly is arranged in the receiving light path and in front of the light entrance side of the detector, and comprises a plurality of aperture plates arranged in sequence. The aperture plates are provided with light transmission holes. The apertures gradually decrease in size along the direction away from the detector. The aperture plates are located in the waist area of the receiving light beam. When the lens group moves to different positions, the corresponding light transmission holes are driven to cut into the receiving light path. The farther the lens group is away from the laser emitter, the smaller the aperture of the cut-in light transmission hole. In the wide-area scanning, the large aperture is cut in to expand the receiving field of view. In the long-distance precision measurement, the small aperture is cut in to block stray light and improve the detection precision. The lens group moves synchronously to complete the waist adjustment and aperture switching, and adaptive switching of the two modes is realized.

Description

Technical Field

[0001] This invention relates to the field of combustible gas detection technology, and in particular to an all-angle laser combustible gas remote sensing device and detection method. Background Technology

[0002] In industries such as petroleum, chemical, and gas, combustible gas leak detection is a key link in ensuring safe production. Laser gas telemetry devices emit lasers and receive the returned light, analyze the characteristic absorption of gas by specific wavelength lasers, and achieve long-distance non-contact detection. They have advantages such as fast response and good selectivity.

[0003] However, existing laser gas telemetry devices typically use fixed-focal-length optical systems, which cannot adaptively adjust according to the detection mode. Wide-area scanning requires a large spot size to expand the coverage area in order to quickly detect leaks, while long-distance precision measurement requires a small spot size to focus energy and suppress background stray light in order to improve accuracy. Fixed-parameter optical systems cannot meet both requirements at the same time. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by proposing an all-angle laser combustible gas remote sensing device and detection method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A telemetry device for omnidirectional laser-driven combustible gas includes: a telemetry instrument body; a laser emitter disposed within the telemetry instrument body for emitting detection laser light; a lens group disposed on the light-emitting side of the laser emitter, capable of reciprocating along the optical signal transmission direction to adjust the beam waist position of the emitted laser; a detector disposed within the telemetry instrument body for receiving laser signals returned from a target; and an aperture assembly disposed in the receiving optical path and located in front of the light-incident side of the detector, comprising multiple apertures arranged at intervals along the optical axis of the receiving optical path, each aperture having a light-transmitting hole, the apertures of the multiple light-transmitting holes decreasing sequentially along the direction away from the detector, and all apertures being located within the beam waist region of the received beam; wherein, when the lens group moves to different positions along the optical signal transmission direction, it drives the light-transmitting hole of the corresponding aperture to enter the receiving optical path, while the remaining apertures exit, and the greater the distance of the lens group from the laser emitter, the smaller the aperture of the light-transmitting hole that enters.

[0006] Preferably, a U-shaped plate is fixedly mounted on the light-emitting side of the laser emitter, a lens bracket is fixedly mounted on the outer side of the lens group, a slide is fixedly mounted on the bottom end of the lens bracket, a lead screw is threadedly connected to the middle of the lower end of the slide, guide rods are symmetrically arranged on both sides of the lead screw, the guide rods are slidably connected to the inside of the slide, the two ends of the guide rods are fixedly connected to the inner side wall of the U-shaped plate, a servo motor is fixedly mounted on the outer side wall of the U-shaped plate, the output end of the servo motor is fixedly connected to the end of the lead screw, and the outer side of the lead screw away from the servo motor is rotatably connected to the inside of the side wall of the U-shaped plate through a bearing.

[0007] Preferably, a fixing plate is fixed to the inner bottom surface of the U-shaped plate, and a plurality of evenly distributed rectangular grooves are formed on the upper end face of the fixing plate. A rectangular piston plate is slidably connected to the inner wall of the rectangular groove. A plurality of evenly distributed first springs are fastened between the bottom end of the rectangular piston plate and the inner bottom surface of the rectangular groove. A sloping plate is fixed to the upper end face of the rectangular piston plate. The two ends of the sloping plate are processed into symmetrical sloping structures. A driving plate is fixed to the middle of the bottom end of the slide block. The bottom end of the driving plate is in contact with the outer surface of the sloping plate. When the rectangular piston plate moves vertically downward, it drives the corresponding aperture to move vertically upward to cut into the receiving optical path.

[0008] Preferably, when the bottom end of the drive plate is in contact with the upper end surface of the inclined plate, the light-passing hole of the aperture plate enters the receiving light path.

[0009] Preferably, the upper surface of the inclined panel is processed into a horizontal section, which extends along the direction of optical signal transmission.

[0010] Preferably, the bottom end of the drive plate is in contact with the upper end surface of the fixed plate, and the inclined plate is initially positioned with its two inclined surfaces higher than the upper end surface of the fixed plate.

[0011] Preferably, a telescopic rod is vertically fixed to the bottom end of the aperture, a circular piston plate is fixed to the bottom end of the telescopic rod, a sleeve is fitted around the outer periphery of the circular piston plate, and a second spring is fastened between the bottom end of the circular piston plate and the inner bottom surface of the sleeve. When the rectangular piston plate moves vertically downward, it drives the corresponding circular piston plate to move vertically upward.

[0012] Preferably, the space formed by the bottom end of the rectangular piston plate and the inner wall of the rectangular groove is the first oil storage space, and the space formed by the bottom end of the circular piston plate and the inner wall of the sleeve is the second oil storage space. An oil delivery hose is fastened between the first oil storage space and the second oil storage space, and hydraulic oil is stored in the first oil storage space, the second oil storage space, and the oil delivery hose.

[0013] Preferably, a scanning gimbal is fixedly installed on the bottom of the telemetry instrument body, and the scanning gimbal is used to drive the telemetry instrument body to rotate at all angles.

[0014] A method for detecting combustible gases using omnidirectional laser technology, based on the omnidirectional laser combustible gas telemetry device described above, comprises the following steps: S1: The laser emitter emits a detection laser, the lens group adjusts the beam waist position of the emitted laser, the scanning gimbal drives the telemetry instrument body to perform a full-angle rotation scan, and the detector receives the returned laser signal. S2: When performing wide-area scanning, the lens group moves to a position close to the laser emitter, drives the largest aperture to enter the receiving optical path, expands the receiving field of view, and quickly detects combustible gas leaks. S3: When a leak is detected and a distant target is being precisely measured, the lens group moves away from the laser emitter, driving a smaller aperture to enter the receiving optical path, blocking background stray light, and improving the accuracy of gas concentration detection.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. When the lens group is close to the laser emitter, the large-aperture light-passing hole cuts into the receiving optical path, expanding the receiving field of view and the amount of light entering, which can quickly cover a large area and detect flammable gas leaks in time. 2. When the lens group is away from the laser emitter, the small aperture cuts into the receiving optical path, physically blocking stray light from the non-focal background. At the same time, the beam waist pushes the light away to make the spot at the target the smallest and the energy density the highest, significantly improving the accuracy of gas concentration detection. 3. The movement of the lens group synchronously completes the beam waist adjustment and the switching of the light aperture. The device automatically matches the optimal light aperture according to the measurement distance, and seamlessly switches between the two modes of wide-area scanning and long-distance precision measurement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the all-angle laser combustible gas telemetry device according to an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the lens group in the all-angle laser combustible gas telemetry device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the sleeve in the all-angle laser combustible gas telemetry device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the fixed plate in the all-angle laser combustible gas telemetry device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the light path cut into the light-transmitting aperture in the all-angle laser combustible gas telemetry device of this invention. Figure 6This is a schematic diagram of the installation of the oil delivery hose in the all-angle laser combustible gas telemetry device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the rectangular piston plate structure in the all-angle laser combustible gas telemetry device according to an embodiment of the present invention; Figure 8 for Figure 4 Enlarged view of the structure at point A in the image.

[0017] In the diagram: 100, Telemetry instrument body; 101, Laser emitter; 102, Lens bracket; 103, Lens group; 104, Detector; 200, U-shaped plate; 201, Servo motor; 202, Lead screw; 203, Guide rod; 204, Slide; 205, Drive plate; 300, Fixing plate; 301, Rectangular groove; 302, Rectangular piston plate; 303, Slanted panel; 304, First spring; 305, Oil hose; 400, Sleeve; 401, Circular piston plate; 402, Second spring; 403, Telescopic rod; 404, Aperture; 405, Light transmission hole. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0020] like Figures 1-8As shown, this embodiment of the invention provides an omnidirectional laser-based remote sensing device for combustible gases, comprising: a telemetry instrument body 100; a laser emitter 101 disposed within the telemetry instrument body 100 for emitting a detection laser; a lens group 103 disposed on the light-emitting side of the laser emitter 101, capable of reciprocating along the optical signal transmission direction to adjust the beam waist position of the emitted laser; a detector 104 disposed within the telemetry instrument body 100 for receiving laser signals returned from a target; and an aperture assembly disposed in the receiving optical path and located in front of the light-incident side of the detector 104, including a lens group along the receiving optical path. Multiple apertures 404 are arranged at intervals along the optical axis. Each aperture 404 has a light-transmitting hole 405. The aperture of the multiple light-transmitting holes 405 decreases sequentially along the direction away from the detector 104, and all apertures 404 are located in the waist region of the receiving beam. When the lens group 103 moves to different positions along the optical signal transmission direction, the light-transmitting hole 405 with the corresponding aperture is driven to enter the receiving optical path, and the other apertures 404 are cut out. The greater the distance between the lens group 103 and the laser emitter 101, the smaller the aperture of the light-transmitting hole 405 that is cut in.

[0021] In this embodiment, when a wide-area scan of the target area is required to detect a leak, the lens group 103 moves to a position close to the laser emitter 101. At this time, the lens group 103 drives the aperture 404 closest to the detector 104 to enter the receiving optical path. The aperture 405 of the aperture 404 has the largest aperture. The large aperture aperture 405 allows more return light signals to enter the detector 104, expanding the receiving field of view, which is beneficial for quickly covering a large area and improving the leak detection efficiency. When a suspected leak point is detected by scanning, and precise quantitative detection of a specific distant target is required, the lens group 103 moves away from the laser emitter 101. As the distance of the lens group 103 from the laser emitter 101 increases, the beam waist of the emitted laser gradually moves further away, the light spot formed at the target gradually becomes smaller, and the energy density gradually increases. At the same time, the lens group 103 sequentially drives the smaller aperture 405 to enter the receiving optical path. When the lens group 103 moves to the position furthest from the laser emitter 101, the smallest aperture 405 enters the receiving optical path. The small aperture 405 only allows the return light near the focal plane to pass through, physically blocking the background stray light outside the focal plane, which significantly improves the gas concentration detection accuracy during long-distance measurement. During the aforementioned adaptive process, the movement of lens group 103 simultaneously achieves two effects: first, it adjusts the beam waist position of the emitted laser to minimize the light spot size and maximize the energy density at the target location, thereby improving the detection capability of weak absorption signals from combustible gases; second, it switches the aperture of the light-transmitting aperture 405 in the receiving optical path to match the aperture size with the measurement distance. The adjustment process is completed automatically without manual intervention, enabling the device to adaptively switch between wide-area scanning and long-distance precision measurement modes, ensuring both the detection efficiency and measurement accuracy of combustible gases.

[0022] like Figure 2 and Figure 4 As shown, optionally, a U-shaped plate 200 is fixedly provided on the light-emitting side of the laser emitter 101, a lens bracket 102 is fixedly installed on the outer side of the lens group 103, a slide block 204 is fixedly provided at the bottom end of the lens bracket 102, a lead screw 202 is threadedly connected to the middle of the lower end of the slide block 204, guide rods 203 are symmetrically arranged on both sides of the lead screw 202, the guide rods 203 are slidably connected to the inside of the slide block 204, the two ends of the guide rods 203 are fixedly connected to the inner side wall of the U-shaped plate 200, a servo motor 201 is fixedly installed on the outer side wall of the U-shaped plate 200, the output end of the servo motor 201 is fixedly connected to the end of the lead screw 202, and the outer side of the lead screw 202 away from the servo motor 201 is rotatably connected to the inside of the side wall of the U-shaped plate 200 through a bearing.

[0023] In this embodiment, when the position of the lens group 103 needs to be adjusted, the servo motor 201 starts and drives the lead screw 202 to rotate. Since the slide 204 is threadedly connected to the lead screw 202 and the slide 204 is limited by the guide rods 203 on both sides, the rotational motion of the lead screw 202 is converted into the linear motion of the slide 204 along the axis of the guide rods 203. The slide 204 drives the lens support 102 and the lens group 103 to move synchronously along the optical signal transmission direction. By controlling the rotation angle of the servo motor 201, the moving distance of the lens group 103 can be precisely controlled, thereby accurately adjusting the beam waist position of the emitted laser to the target distance.

[0024] like Figures 2-8 As shown, optionally, a fixing plate 300 is fixedly provided on the inner bottom surface of the U-shaped plate 200. The upper end face of the fixing plate 300 is provided with a plurality of evenly distributed rectangular grooves 301. A rectangular piston plate 302 is slidably connected to the inner wall of the rectangular groove 301. A plurality of evenly distributed first springs 304 are fastened between the bottom end of the rectangular piston plate 302 and the inner bottom surface of the rectangular groove 301. An inclined plate 303 is fixedly provided on the upper end face of the rectangular piston plate 302. The two ends of the inclined plate 303 are processed into symmetrical inclined surface structures. A driving plate 205 is fixedly provided in the middle of the bottom end of the slide 204. The bottom end of the driving plate 205 is in contact with the outer surface of the inclined plate 303. When the rectangular piston plate 302 moves vertically downward, it drives the corresponding aperture 404 to move vertically upward to cut into the receiving optical path.

[0025] In this embodiment, when the slide 204 moves along the optical signal transmission direction under the drive of the lead screw 202, the drive plate 205 fixed at the bottom of the slide 204 moves synchronously. The bottom end of the drive plate 205 contacts and connects with the outer surface of the inclined plate 303. When the drive plate 205 moves above a certain inclined plate 303, the drive plate 205 slides along the inclined surface of the inclined plate 303, pressing the inclined plate 303 downward. After being subjected to force, the inclined plate 303 drives the rectangular piston plate 302 in the rectangular groove 301. The drive plate 205 slides vertically downwards, compressing the first spring 304. The vertical downward movement of the rectangular piston plate 302 drives the corresponding aperture 404 to move vertically upwards, causing the light-passing aperture 405 of the aperture 404 to engage with the receiving light path. When the drive plate 205 continues to move and leaves the inclined panel 303, the first spring 304 pushes the rectangular piston plate 302 to return to its vertical position. The inclined panel 303 then rises, and the corresponding aperture 404 moves vertically downwards under its own reset, engaging with the receiving light path. Through the sequential contact and engagement of the drive plate 205 with different inclined panels 303, the function of driving the corresponding aperture 404 to engage with the receiving light path when the lens group 103 moves to different positions is realized, while the other apertures 404 remain in the engaged state.

[0026] like Figures 2-5 As shown, optionally, when the bottom end of the drive plate 205 is in contact with the upper end surface of the inclined plate 303, the light-passing hole 405 of the aperture 404 cuts into the receiving light path.

[0027] In this embodiment, when the bottom end of the drive plate 205 slides from the inclined surface of the inclined plate 303 to the upper end surface and comes into contact with the upper end surface, the inclined plate 303 is pressed to the lowest position, the rectangular piston plate 302 is in the maximum compression stroke in the rectangular groove 301, the first spring 304 is compressed to the shortest state, at this time, the driven aperture 404 moves vertically upward to the limit position, its light-passing hole 405 is completely cut into the receiving light path and aligned with the receiving light axis, and the other apertures 404 are all in the cut-out state.

[0028] like Figure 2 and Figure 7 As shown, optionally, the upper surface of the inclined panel 303 is processed into a horizontal section, which extends along the direction of optical signal transmission.

[0029] In this embodiment, when the drive plate 205 slides within the horizontal section of the inclined plate 303, the inclined plate 303 is always pressed at the same height position, the rectangular piston plate 302 maintains the same compression depth in the rectangular groove 301, and the corresponding aperture 404 continues to be in the state of cutting into the receiving optical path. Only when the drive plate 205 slides out of the horizontal section and enters the inclined area of ​​the adjacent inclined plate 303 will the switching action of the aperture 404 be triggered.

[0030] like Figure 4 and Figure 8As shown, optionally, the bottom end of the drive plate 205 is in contact with the upper end surface of the fixed plate 300, and the inclined plate 303 is initially positioned with its two inclined surfaces higher than the upper end surface of the fixed plate 300.

[0031] In this embodiment, in the initial state, that is, when the drive plate 205 does not press any inclined panel 303, each inclined panel 303 is in a high position under the support of the first spring 304, and the inclined surfaces on both sides of the inclined panel 303 are higher than the upper end surface of the fixed plate 300. At this time, all apertures 404 are in the cut-out state. When the bottom end of the drive plate 205 first contacts the inclined surface portion of the inclined panel 303 that is higher than the upper end surface of the fixed plate 300, it slides along the inclined surface and gradually presses down the inclined panel 303.

[0032] like Figures 3-5 As shown, optionally, a telescopic rod 403 is vertically fixed at the bottom end of the aperture 404, a circular piston plate 401 is fixed at the bottom end of the telescopic rod 403, a sleeve 400 is fitted around the outer periphery of the circular piston plate 401, and a second spring 402 is fastened between the bottom end of the circular piston plate 401 and the inner bottom surface of the sleeve 400. When the rectangular piston plate 302 moves vertically downward, it drives the corresponding circular piston plate 401 to move vertically upward.

[0033] In this embodiment, when the rectangular piston plate 302 moves vertically downward under the action of the drive plate 205 and the inclined plate 303, the rectangular piston plate 302 drives the corresponding circular piston plate 401 to move vertically upward. The circular piston plate 401 slides upward in the sleeve 400, stretching the second spring 402. The circular piston plate 401 drives the telescopic rod 403 to move upward. The telescopic rod 403 pushes the aperture 404 to move vertically upward, so that the light-passing hole 405 of the aperture 404 cuts into the receiving light path.

[0034] like Figures 2-8 As shown, optionally, the space formed by the bottom end of the rectangular piston plate 302 and the inner wall of the rectangular groove 301 is the first oil storage space, and the space formed by the bottom end of the circular piston plate 401 and the inner wall of the sleeve 400 is the second oil storage space. The first oil storage space and the second oil storage space are fastened and connected by an oil delivery hose 305. Hydraulic oil is stored in the first oil storage space, the second oil storage space and the oil delivery hose 305.

[0035] In this embodiment, Figure 5The direction of the middle arrow indicates the hydraulic oil delivery direction. When the rectangular piston plate 302 moves vertically downward, the volume of the first oil storage space decreases, and the hydraulic oil inside is squeezed and enters the second oil storage space through the oil delivery hose 305. The hydraulic oil entering the second oil storage space pushes the circular piston plate 401 to move vertically upward within the sleeve 400. The circular piston plate 401 drives the aperture 404 to move vertically upward through the telescopic rod 403, so that the light-transmitting hole 405 cuts into the receiving light path. When the drive plate 205 leaves the inclined plate 303, the rectangular piston plate 302 returns to its original position under the action of the first spring 304, and the volume of the first oil storage space increases. The hydraulic oil in the second oil storage space flows back to the first oil storage space through the oil delivery hose 305 under the action of the second spring 402 and the circular piston plate 401. The circular piston plate 401 returns to its original position downward, and the aperture 404 cuts out of the receiving light path.

[0036] like Figure 1 As shown, optionally, a scanning gimbal is fixedly installed on the bottom of the telemetry instrument body 100, and the scanning gimbal is used to drive the telemetry instrument body 100 to rotate at all angles.

[0037] In this embodiment, when the scanning pan-tilt unit drives the telemetry instrument body 100 to rotate at all angles, the detection laser emitted by the laser emitter 101 is emitted to the outside after passing through the lens group 103, and the detector 104 receives the laser signal returned from the target, realizing the all-angle telemetry of combustible gas. In the wide-area scanning mode, the scanning pan-tilt unit rotates continuously, and the device quickly checks a large area. When a suspected leak point is found, the scanning pan-tilt unit locks the azimuth angle, and the device switches to the long-distance precision measurement mode to accurately analyze the locked target. The specific switching process and principle are existing technologies and will not be described here.

[0038] like Figures 1-8 As shown, an all-angle laser combustible gas detection method, based on the all-angle laser combustible gas telemetry device described above, comprises the following steps: S1: The laser emitter 101 emits a detection laser, the lens group 103 adjusts the beam waist position of the emitted laser, the scanning gimbal drives the telemetry instrument body 100 to perform full-angle rotation scanning, and the detector 104 receives the returned laser signal. S2: When performing wide-area scanning, the lens group 103 moves to a position close to the laser emitter 101, driving the largest aperture of the light-transmitting hole 405 to enter the receiving optical path, expanding the receiving field of view, and quickly detecting combustible gas leaks. S3: When a leak is detected and a distant target is precisely measured, the lens group 103 moves away from the laser emitter 101, driving the smaller aperture 405 to enter the receiving optical path, blocking background stray light and improving the gas concentration detection accuracy.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A 360-degree laser remote sensing device for combustible gases, characterized in that, include: Telemetry instrument body (100); A laser emitter (101) is located inside the telemetry instrument body (100) and is used to emit detection laser; The lens group (103) is located on the light-emitting side of the laser emitter (101) and can be moved back and forth along the optical signal transmission direction to adjust the beam waist position of the emitted laser. A detector (104) is located inside the telemetry instrument body (100) and is used to receive laser signals returned from the target; An aperture assembly is disposed in the receiving optical path and located in front of the light-incident side of the detector (104). It includes a plurality of apertures (404) arranged sequentially at intervals along the optical axis of the receiving optical path. Each aperture (404) has a light-transmitting hole (405). The aperture of the plurality of light-transmitting holes (405) decreases sequentially in the direction away from the detector (104), and all apertures (404) are located in the waist region of the receiving beam. When the lens group (103) moves to different positions along the optical signal transmission direction, it drives the corresponding aperture (405) to cut into the receiving optical path, while the other apertures (404) cut out. The greater the distance between the lens group (103) and the laser emitter (101), the smaller the aperture of the cut-in aperture (405).

2. The omnidirectional laser combustible gas remote sensing device according to claim 1, characterized in that, A U-shaped plate (200) is fixedly mounted on the light-emitting side of the laser emitter (101). A lens bracket (102) is fixedly mounted on the outer side of the lens group (103). A slide (204) is fixedly mounted at the bottom end of the lens bracket (102). A lead screw (202) is threadedly connected to the middle of the lower end of the slide (204). Guide rods (203) are symmetrically arranged on both sides of the lead screw (202). The guide rods (203) are slidably connected to the slide (204). The two ends of the guide rods (203) are fixedly connected to the inner side wall of the U-shaped plate (200). A servo motor (201) is fixedly mounted on the outer side wall of the U-shaped plate (200). The output end of the servo motor (201) is fixedly connected to the end of the lead screw (202). The outer side of the lead screw (202) away from the servo motor (201) is rotatably connected to the inside of the side wall of the U-shaped plate (200) through a bearing.

3. The omnidirectional laser combustible gas remote sensing device according to claim 2, characterized in that, A fixing plate (300) is fixedly provided on the inner bottom surface of the U-shaped plate (200). The upper end face of the fixing plate (300) is provided with a plurality of evenly distributed rectangular grooves (301). A rectangular piston plate (302) is slidably connected to the inner wall of the rectangular groove (301). A plurality of evenly distributed first springs (304) are fastened between the bottom end of the rectangular piston plate (302) and the inner bottom surface of the rectangular groove (301). A sloping plate (303) is fixedly provided on the upper end face of the rectangular piston plate (302). The two ends of the sloping plate (303) are processed into symmetrical sloping structures. A driving plate (205) is fixedly provided in the middle of the bottom end of the slide (204). The bottom end of the driving plate (205) is in contact with the outer surface of the sloping plate (303). When the rectangular piston plate (302) moves vertically downward, it drives the corresponding aperture (404) to move vertically upward to cut into the receiving optical path.

4. The omnidirectional laser combustible gas remote sensing device according to claim 3, characterized in that, When the bottom end of the drive plate (205) is in contact with the upper end surface of the inclined plate (303), the light-transmitting hole (405) of the aperture (404) cuts into the receiving light path.

5. The omnidirectional laser combustible gas remote sensing device according to claim 3, characterized in that, The upper surface of the inclined panel (303) is processed into a horizontal section, which extends along the direction of optical signal transmission.

6. The omnidirectional laser combustible gas remote sensing device according to claim 3, characterized in that, The bottom end of the drive plate (205) is in contact with the upper end of the fixed plate (300), and the inclined plate (303) is initially positioned with its two inclined surfaces higher than the upper end of the fixed plate (300).

7. The omnidirectional laser combustible gas telemetry device according to claim 4, characterized in that, A telescopic rod (403) is vertically fixed at the bottom end of the aperture (404), and a circular piston plate (401) is fixed at the bottom end of the telescopic rod (403). A sleeve (400) is fitted around the outer periphery of the circular piston plate (401). A second spring (402) is fastened between the bottom end of the circular piston plate (401) and the inner bottom surface of the sleeve (400). When the rectangular piston plate (302) moves vertically downward, it drives the corresponding circular piston plate (401) to move vertically upward.

8. The omnidirectional laser combustible gas remote sensing device according to claim 7, characterized in that, The space formed by the bottom end of the rectangular piston plate (302) and the inner wall of the rectangular groove (301) is the first oil storage space, and the space formed by the bottom end of the circular piston plate (401) and the inner wall of the sleeve (400) is the second oil storage space. The first oil storage space and the second oil storage space are tightly connected by an oil delivery hose (305). Hydraulic oil is stored in the first oil storage space, the second oil storage space and the oil delivery hose (305).

9. The omnidirectional laser combustible gas remote sensing device according to claim 1, characterized in that, A scanning gimbal is fixedly installed on the bottom of the telemetry instrument body (100), and the scanning gimbal is used to drive the telemetry instrument body (100) to rotate at all angles.

10. A method for detecting combustible gases using omnidirectional laser technology, based on the omnidirectional laser combustible gas telemetry device as described in any one of claims 1-9, characterized in that, The steps are as follows: S1: The laser emitter (101) emits a detection laser, the lens group (103) adjusts the beam waist position of the emitted laser, the scanning gimbal drives the telemetry instrument body (100) to perform full-angle rotation scanning, and the detector (104) receives the returned laser signal. S2: When performing wide-area scanning, the lens group (103) moves to a position close to the laser emitter (101), drives the largest aperture (405) to enter the receiving optical path, expands the receiving field of view, and quickly detects combustible gas leaks. S3: When a leak is detected and a distant target is precisely measured, the lens group (103) moves away from the laser emitter (101), driving the smaller aperture (405) to enter the receiving optical path, blocking background stray light, and improving the gas concentration detection accuracy.

Images