Single-cavity composite multi-laser reflector and manufacturing method thereof

Abstract

The invention discloses a single-cavity composite multi-laser reflector and a manufacturing method thereof. The reflector comprises a reflection chamber, a plurality of lateral reflection layers are fixedly arranged on the inner wall of the reflection chamber, and the reflection chamber is provided with a single gas detection space; the at least two groups of photoelectric transceiving modules are mounted outside, and optical axes point to the inside; the light path adjusting structure is arranged at the light path turning position and used for deflecting the light beam to the direction parallel to the bottom face of the cavity, and the light beam is reflected by the lateral reflecting layer and then reaches the detector. The horizontal distance between the laser and the detector in the same group is larger than 1 / 3 of the maximum inner diameter of the reflection cavity, the minimum space intersection included angle of any two groups of independent light paths is larger than 18 degrees, and the overlapping area does not exceed 2 mm. According to the invention, interference-free operation of two independent laser light paths is realized in a single closed chamber, compared with a multi-chamber scheme, the size of the device is greatly reduced, the cost is reduced, light path crosstalk is completely eradicated through strict geometric constraints, and high-precision multi-gas synchronous detection is realized.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically to a single-chamber composite multi-laser reflector and its manufacturing method. Background Technology

[0002] In the field of gas detection, laser gas sensors are core components. In traditional technologies, reflectors generally adopt a "single chamber-single laser" structural design, meaning that one reflective chamber can only accommodate one set of lasers and detectors, and can only detect one type of target gas at a time.

[0003] With the increasing demand for industrial safety and environmental monitoring, it is often necessary to simultaneously detect multiple gases. Existing technologies typically employ two approaches: one is to deploy multiple independent "single-chamber-single-laser" detection devices, which results in a large overall equipment size, high installation space requirements, and significant challenges in data synchronization between multiple devices, making them susceptible to detection errors due to environmental interference; the other is to adopt a multi-optical-path solution integrating multiple independent chambers, where each chamber corresponds to a set of lasers and detectors, achieving multi-gas detection through chamber splicing. However, this approach not only has a complex overall structure and high assembly precision requirements, but also suffers from thermal conduction and vibration interference between chambers, affecting detection stability, and the equipment cost increases significantly with the number of chambers.

[0004] Therefore, how to achieve interference-free transmission of multiple lasers within a single chamber and achieve a balance between equipment miniaturization and high-precision detection is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a single-chamber composite multi-laser reflector and its manufacturing method, thereby solving the technical problems of large size and high cost of existing multi-gas detection equipment.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: In a first aspect, this application provides a single-chamber composite multi-laser reflector, comprising: A reflective chamber, wherein multiple lateral reflective layers are fixed on the inner wall of the reflective chamber, and the reflective chamber has a single gas detection space; At least two sets of optoelectronic transceiver modules, each set including a laser and a detector, wherein the laser and the detector are mounted outside the reflective cavity, and their emission or reception optical axes point towards the interior of the reflective cavity; and An optical path adjustment structure is provided at the optical path turning point where the laser and the detector extend into the interior of the reflective cavity. The structure is used to deflect the emitted beam of the laser to a direction parallel to the bottom surface of the reflective cavity, and then deflect it to the detector after at least one reflection by the lateral reflective layer. Wherein, the straight-line distance between the laser and the detector in the same group on the horizontal projection plane is greater than one-third of the maximum inner diameter of the reflective cavity, and the minimum spatial intersection angle between any two independent optical paths in the reflective cavity assembly is greater than 18 degrees, and the length of the optical path overlap area does not exceed 2mm.

[0007] In some embodiments of this application, the material of the reflective cavity includes aluminum alloy or quartz glass, and the inner sides of the top and bottom surfaces of the reflective cavity are provided with sandblasted and anodized layers. The maximum inner diameter of the reflective cavity is 3cm to 5cm, and the height is 3mm to 6mm.

[0008] In some embodiments of this application, the optical path adjustment structure includes a mounting base and a reflector. The reflector is mounted on the bottom surface of the reflection chamber via the mounting base. The reflector is tilted at an angle of 45±1 degrees to the horizontal plane. The maximum side length of the reflector is 2mm to 5mm.

[0009] In some embodiments of this application, an adhesive layer is further included, which is disposed between the bottom surface of the mounting base and the bottom surface of the reflective cavity, and the mounting base is fixedly connected to the reflective cavity through the adhesive layer.

[0010] In some embodiments of this application, the inner wall of the reflective chamber has a circular cross-section, and a plurality of filling blocks are provided in the reflective chamber. Each filling block has a first mating surface and a second mounting surface facing away from each other. The first mating surface is an arc-shaped surface that fits against the inner wall, and the second mounting surface is a plane for mounting the lateral reflective layer.

[0011] In some embodiments of this application, the top surface of the reflecting chamber has multiple through holes, and a sealing lens is disposed at each through hole. The sealing lens is connected to the sidewall of the through hole, and the axial direction of the through hole is parallel to the optical axis of the corresponding laser or detector. In some embodiments of this application, a sealing ring is provided between the optoelectronic transceiver module and the reflective cavity. The sealing ring is sleeved around the bottom of the laser or the detector to seal the gap at the through hole on the top surface of the reflective cavity.

[0012] In some embodiments of this application, a timing control circuit is also included, which is connected to at least two of the optoelectronic transceiver modules respectively, for controlling at least two sets of lasers to emit light alternately in a time-division manner.

[0013] In some embodiments of this application, the two sets of photoelectric transceiver modules are non-centrally symmetrically distributed on the reflective cavity, the difference between the incident point of the two sets of optical paths and the center of the reflective cavity is greater than 2 mm, and the incident directions are not collinear.

[0014] Secondly, this application also provides a method for manufacturing a single-cavity composite multi-laser reflector, applicable to the single-cavity composite multi-laser reflector as described in any embodiment of the first aspect, comprising the following steps: S1. Initially install the laser, detector, and optical path adjustment structure; S2. Adjust the position and angle of each component so that the minimum spatial intersection angle between the two laser beam paths formed in the reflection chamber is greater than 18 degrees, and the relative distance between the laser and the detector in the same group is greater than one-third of the maximum inner diameter of the reflection chamber. S3. Based on the concentration value of the gas to be detected, change the circumferential orientation of the optical path adjustment structure in the horizontal plane to adjust the propagation path of the laser beam and control the number of reflections and effective optical path of the beam between the laser and the detector. S4. Fix the angle and position of the optical path adjustment structure; S5. Configure the laser with the appropriate operating power according to the effective optical path of the beam.

[0015] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include: This invention successfully constructs two independent detection channels that do not interfere with each other within a single sealed chamber through an asymmetrical layout and optical path adjustment structure within a single chamber, coupled with strict geometric spatial constraints (distance, angle, and overlapping area). Compared to multi-chamber solutions, this approach reduces the device size by more than 60% and significantly lowers manufacturing costs. Compared to traditional single-chamber multi-optical-path solutions, it eliminates mode coupling and signal crosstalk caused by small-angle intersections, ensuring detection accuracy and stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a schematic diagram of the structure of a single-chamber composite multi-laser reflector in an embodiment of this application; Figure 2 This is a schematic diagram of the optical path of a single-chamber composite multi-laser reflector according to an embodiment of this application; Figure 3 This is a schematic diagram of the optical path of another single-chamber composite multi-laser reflector in an embodiment of this application; Figure 4 This is a schematic diagram of an optical path adjustment structure according to an embodiment of this application; Figure 5 This is a schematic flowchart of a manufacturing method according to an embodiment of this application.

[0017] Figure label: 100 - Reflective chamber; 110 - Lateral reflective layer; 120 - Filler block; 200 - Optoelectronic transceiver module; 210 - Laser; 220 - Detector; 300 - Optical path adjustment structure; 310 - Mounting base; 320 - Reflector. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] Those skilled in the art will understand that, in this specification, the term "comprising" is an open-ended expression, meaning that the stated feature is present but other features are excluded. Directional terms such as "upper," "lower," "left," and "right" refer to exemplary directions based on the accompanying drawings. Features specified as "first" or "second" implicitly include one or more of that feature. Singular expressions can also be used in plural forms. "Multiple" means two or more. The terms "installed," "connected," and "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection via an intermediate medium, and it can be a connection within two components. Furthermore, "linked" can include wireless connections.

[0020] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a single-chamber composite multi-laser reflector and its manufacturing method, thereby solving the technical problems of large size and high cost of existing multi-gas detection equipment.

[0021] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: like Figures 1-5 As shown, this embodiment provides a single-chamber composite multi-laser reflector, including a reflective chamber 100, at least two sets of optoelectronic transceiver modules 200, and an optical path adjustment structure 300.

[0022] The reflective chamber 100 is the main body of the device, and multiple lateral reflective layers 110 are fixed on the inner side of its side wall. The reflective chamber 100 has a single gas detection space.

[0023] At least two sets of optoelectronic transceiver modules 200 (two sets are shown in the figure), each set including a laser 210 and a detector 220. The laser 210 and detector 220 are mounted outside the reflective cavity 100 with their optical axes pointing inward.

[0024] The optical path adjustment structure 300 is located at the optical path bend where the laser 210 and detector 220 extend into the reflecting chamber 100. Specifically, the laser 210 emits laser light vertically downwards, and the optical path adjustment structure 300 deflects it by approximately 90 degrees, making it propagate parallel to the bottom surface. The beam undergoes at least one reflection (e.g., 1, 3, or 5) between the lateral reflecting layers 110, and is finally deflected upwards again by another optical path adjustment structure 300 below the detector 220 before entering the detector 220.

[0025] The core of this invention lies in strict geometric constraints: the straight-line distance between the same set of lasers 210 and detectors 220 on the horizontal projection plane is greater than one-third of the maximum inner diameter of the reflecting cavity 100. Simultaneously, the minimum spatial intersection angle between any two independent optical paths within the reflecting cavity 100 is greater than 18 degrees, and the length of the overlapping area of ​​the optical paths does not exceed 2 mm.

[0026] Working principle: The laser 210 emits a beam, which is deflected by the optical path adjustment structure 300 and then propagates horizontally within the cavity, interacting fully with the gas to be measured. The lateral reflection layer 110 extends the optical path. By limiting the distance between the transmitter and receiver, sufficient space for the optical path to unfold is ensured, avoiding constraint failure due to insufficient space in the reflection fixture. By limiting the optical path crossing angle to >18°, long-distance overlap (>2mm) caused by small-angle (≤18°) crossings is avoided, thereby eliminating mode coupling, gain medium disturbance, and local temperature gradient caused by optical field superposition, preventing wavelength drift and signal crosstalk. This achieves interference-free dual-optical-path detection within a single cavity, with a small size, compact structure, strong signal independence, and high accuracy.

[0027] This embodiment provides a detailed description of the material and processing technology of the reflecting chamber 100. The reflecting chamber 100 is made of high-reflectivity, corrosion-resistant aluminum alloy or quartz glass. The top surface, bottom surface, and inner sidewalls of the reflecting chamber 100 are all provided with a sandblasted anodized layer. A lateral reflecting layer 110 is then attached to the sidewalls of the reflecting chamber 100. The lateral reflecting layer 110 can either completely cover the plane of the filling block in the following embodiment or be selectively attached only to the beam reflection area. Typical dimensions of the reflecting chamber are: a maximum inner diameter of 3cm to 5cm and a height of 3mm to 6mm.

[0028] Aluminum alloy or quartz glass provides excellent mechanical strength and optical stability. High-reflectivity layers are incorporated into the sidewalls for laser transmission, while the sandblasted and anodized layers on the top and bottom surfaces create diffuse reflective surfaces. When a small amount of scattered light from the laser propagates and strikes these surfaces, it is absorbed or attenuated by diffuse reflection, preventing stray light from being reflected into detector 220. This reduces background noise, improves the system's signal-to-noise ratio, and the compact design addresses miniaturization requirements. Furthermore, sandblasting enhances the adhesion of the colloid.

[0029] This embodiment describes the optical path adjustment structure 300 in detail. The optical path adjustment structure 300 includes a mounting base 310 and a reflector 320. The reflector 320 is mounted on the bottom surface of the reflection chamber 100 via the mounting base 310. The reflector 320 is tilted at an angle of 45±1 degrees to the horizontal plane to achieve a 90-degree deflection of the light beam. The reflector 320 is miniaturized, with a maximum side length of 2mm to 5mm.

[0030] The tiny reflector 320, combined with a precise 45-degree angle (adjustable during manufacturing), allows for accurate control of the beam's entry and exit directions. Miniaturization reduces interference with the internal airflow field. The simple structure enables the beam to transition from a vertical to a horizontal direction, facilitating the vertical mounting of external modules and reducing the device's lateral dimensions.

[0031] This embodiment also includes an adhesive layer disposed between the bottom surface of the mounting base 310 and the bottom surface of the reflective chamber 100.

[0032] During the manufacturing process, after adjusting the angle and position of the mounting base 310, it is permanently fixed together using adhesives (such as UV glue or epoxy resin). This ensures the positional stability of the optical path adjustment structure under long-term use and vibration environments, preventing optical path deviation.

[0033] This embodiment relates to a reflective structure for the sidewall. The basic cross-sectional profile of the inner wall of the reflective chamber 100 is circular. Multiple filler blocks 120 are also provided within the reflective chamber 100. Each filler block 120 has a first mating surface and a second mounting surface. The first mating surface is an arc-shaped surface that fits tightly against the circular inner wall; the second mounting surface is a flat surface used to adhere and fix the lateral reflective layer 110.

[0034] Traditional circular inner walls cause beam divergence. By introducing a filler block 120, the reflective surface of the circular cavity is transformed into a polygonal planar reflective system. The planar lateral reflective layer 110 maintains the collimation of the laser beam. This improves beam quality, reduces beam spread after multiple reflections, and ensures the energy density received by the detector.

[0035] This embodiment relates to a sealing structure. The reflector also includes multiple sealing lenses. The top surface of the reflecting chamber 100 has multiple through holes, and the sealing lenses are fixedly connected to the sidewalls of the through holes (or inside the countersunk holes on the top surface) by threads or pressure rings. The axis of the through holes is parallel to the optical axis of the laser 210 or the detector 220.

[0036] The sealed lens acts as a light window, isolating the gas to be measured inside the cavity from external photoelectric components while allowing the laser to pass through. This protects the expensive laser and detector from corrosive gases.

[0037] This embodiment incorporates circuit control. The reflector also includes a timing control circuit board, which is connected to at least two optoelectronic transceiver modules 200. The timing control circuit board includes a microprocessor and at least two laser drive modules.

[0038] Wavelength time-division multiplexing technology is employed. The microprocessor triggers the first group of laser driving modules to emit within 0-10ms, and triggers the second group to emit within 10-20ms. Even if the two optical paths intersect in physical space, mutual interference between the optical signals is completely avoided through time separation, making it suitable for scenarios where real-time requirements are not stringent but accuracy requirements are extremely high.

[0039] This embodiment relates to thermal isolation. A fluororubber sealing ring is provided between the optoelectronic transceiver module 200 and the reflective cavity 100; the fluororubber sealing ring is sleeved around the base of the laser 210 or the detector 220, and its cross-section is circular or rectangular; the fluororubber sealing ring undergoes elastic deformation when subjected to axial pressure to seal the gap at the through hole on the top surface of the reflective cavity 100 and to prevent heat exchange between the external environment and the gas inside the cavity.

[0040] This embodiment describes the specific layout of the two sets of optical paths. The two sets of optoelectronic transceiver modules 200 are mounted on the reflective cavity 100 in a non-centrally symmetrical, intersecting distribution. Specifically, the difference in distance between the incident point of the two sets of optical paths and the center of the reflective cavity 100 is greater than 2 mm, and the incident directions of the two sets of optical paths are not collinear.

[0041] This asymmetrical layout breaks the geometric symmetry of the circular cavity, causing the two light paths to follow drastically different trajectories during reflection, greatly reducing the probability of light path overlap. This reduces the risk of optical crosstalk from the source of physical structural design.

[0042] This embodiment provides a method for manufacturing a single-cavity composite multi-laser reflector, the steps of which are as follows: S1: The laser 210, detector 220 and optical path adjustment structure 300 are initially installed on the reflective cavity 100. At this time, the adhesive layer has not yet cured.

[0043] S2: Adjust the position and angle of each component. Using auxiliary light or ZEMAX simulation data as guidance, fine-tune the horizontal azimuth and tilt angle of the optical path adjustment structure 300 to ensure that the minimum spatial angle between the two optical paths is >18 degrees and the transmission and reception distance is >1 / 3 of the chamber diameter.

[0044] S3: Based on the concentration of the gas to be detected, change the circumferential orientation of the optical path adjustment structure 300 in the horizontal plane (or the incident angle of the laser) to adjust the number of reflections and the optical path. For example, when detecting low-concentration gases, adjust the angle to increase the number of reflections (e.g., from 1 to 3), thus extending the optical path; when detecting high-concentration gases, reduce the number of reflections and shorten the optical path.

[0045] S4: After confirming that the optical path is correct, harden the adhesive layer by UV curing or heat curing to fix the angle and position of the reflector 320.

[0046] S5: Configure the laser 210 with the appropriate operating power based on the final effective optical path of the beam. Configure high power for long optical paths to compensate for losses, and configure low power for short optical paths to avoid saturation.

[0047] This method brings the optical path debugging process forward to the manufacturing stage, enabling customized optical path design through flexible assembly adjustments. Once fixed, it forms a stable finished product. It solves the problem of single-chamber optical paths being difficult to adapt to different concentration detection needs after fixation, achieving flexible adaptation of the same hardware structure to different detection requirements.

[0048] Due to manufacturing and assembly tolerances, it is difficult to achieve a perfectly vertical and horizontal beam. The tilt angle of the reflector 320 in the optical path adjustment structure 300 is not strictly 45 degrees, but is set to 45 ± Δ1 degrees (e.g., 45.5 degrees). When the angle of the reflector 320 deviates slightly from 45 degrees, the horizontally propagating beam will generate a component in the vertical direction. After multiple reflections, the trajectory of the beam within the cavity is no longer a broken line in a two-dimensional plane, but a spiral or wavy line in three-dimensional space.

[0049] By controlling the error values ​​of the two sets of reflectors, such as greater than 45 degrees and less than 45 degrees respectively, the two optical paths can be configured as upward spiral and downward spiral respectively. Correspondingly, the lateral reflective layer 110 and the bottom surface of the reflective cavity 100 are set at an angle of 90±1 degrees to correct the error value of the optical path in the vertical direction, preventing the light beam from interfering with the top and bottom surfaces of the reflective cavity 100 before entering the detector. Utilizing the vertical spatial dimension, potential intersections in the two-dimensional plane are transformed into misalignment points in three-dimensional space, further reducing the probability of optical path intersections and improving anti-interference capabilities.

[0050] This embodiment refines the manufacturing method. In step S2, ZEMAX optical simulation software is introduced for path verification. Before actual assembly or during assembly adjustment, the laser fine-tuning angle (±0.5°) and reflector adjustment angle (±3°) are input into the simulation model to simulate the optical path trajectory across the entire adjustment range. Only when the simulation results show that there is no overlap in any area with a length exceeding 2mm is the fixing in step S4 performed.

[0051] A quantitative verification mechanism is provided to ensure that the optical path anti-interference performance of each device meets the design standards during mass production, avoiding the blindness of debugging based on experience.

[0052] This embodiment focuses on the physical consequences of beam overlap. When designing the optical path, not only are geometric angles considered, but the beam diameter within the cavity is also controlled by a beam-shaping lens (integrated within the laser module).

[0053] Because overlapping regions can cause "mode coupling" and "gain medium perturbation," by controlling the spot size and using an angle greater than 18°, it is ensured that even if two beams pass each other at a point in space, their intensity peaks will not overlap. From the perspective of physical optics, this further eliminates the conditions for interference or coupling between the two laser beams, ensuring the purity of the detection signal.

[0054] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include: In summary, this invention successfully achieves the composite of two or more laser optical paths by employing an asymmetric optoelectronic module layout within a single sealed reflective cavity, combined with a unique optical path adjustment structure. Through precise control of the optical path turning angles and positions during the manufacturing stage, supplemented by strict geometric spatial constraints (distance > 1 / 3 diameter, included angle > 18°, overlap < 2mm), this invention effectively solves the problems of signal crosstalk and mode coupling between multiple optical paths while significantly reducing equipment size and cost. This reflector has a simple structure, high precision, and good stability, making it particularly suitable for portable and embedded multi-gas detection equipment.

[0055] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, processes, and procedures discussed in this application can be alternated, modified, rearranged, decomposed, combined, or deleted.

[0056] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A single-chamber composite multi-laser reflector, characterized in that, include: A reflective chamber, wherein multiple lateral reflective layers are fixed on the inner wall of the reflective chamber, and the reflective chamber has a single gas detection space; At least two sets of optoelectronic transceiver modules, each set of optoelectronic transceiver modules includes a laser and a detector, the laser and the detector are installed outside the reflective cavity, and their outgoing or receiving optical axes point to the inside of the reflective cavity; as well as An optical path adjustment structure is provided at the optical path turning point where the laser and the detector extend into the interior of the reflective cavity. The structure is used to deflect the emitted beam of the laser to a direction parallel to the bottom surface of the reflective cavity, and then deflect it to the detector after at least one reflection by the lateral reflective layer. Wherein, the straight-line distance between the laser and the detector in the same group on the horizontal projection plane is greater than one-third of the maximum inner diameter of the reflective cavity, and the minimum spatial intersection angle between any two independent optical paths in the reflective cavity assembly is greater than 18 degrees, and the length of the optical path overlap area does not exceed 2mm.

2. The single-chamber composite multi-laser reflector according to claim 1, characterized in that, The material of the reflective chamber includes aluminum alloy or quartz glass. The top and bottom inner surfaces of the reflective chamber are provided with sandblasted and anodized layers. The maximum inner diameter of the reflective chamber is 3cm to 5cm and the height is 3mm to 6mm.

3. The single-chamber composite multi-laser reflector according to claim 1, characterized in that, The optical path adjustment structure includes a mounting base and a reflector. The reflector is mounted on the bottom surface of the reflection chamber via the mounting base. The reflector is tilted at an angle of 45±1 degrees to the horizontal plane. The maximum side length of the reflector is 2mm to 5mm.

4. The single-chamber composite multi-laser reflector according to claim 3, characterized in that, It also includes an adhesive layer, which is disposed between the bottom surface of the mounting base and the bottom surface of the reflective cavity, and the mounting base is fixedly connected to the reflective cavity through the adhesive layer.

5. The single-chamber composite multi-laser reflector according to claim 1, characterized in that, The inner wall of the reflective chamber has a circular cross-section. The reflective chamber is also provided with a plurality of filling blocks. Each filling block has a first mating surface and a second mounting surface facing away from each other. The first mating surface is an arc-shaped surface that fits against the inner wall, and the second mounting surface is a plane for mounting the lateral reflective layer.

6. The single-chamber composite multi-laser reflector according to claim 1, characterized in that, The top surface of the reflecting chamber has multiple through holes, and a sealing lens is installed at each through hole. The sealing lens is connected to the side wall of the through hole, and the axial direction of the through hole is parallel to the optical axis of the corresponding laser or detector.

7. The single-chamber composite multi-laser reflector according to claim 6, characterized in that, A sealing ring is provided between the optoelectronic transceiver module and the reflective cavity. The sealing ring is fitted around the bottom of the laser or the detector to seal the gap at the through hole on the top surface of the reflective cavity.

8. The single-chamber composite multi-laser reflector according to claim 1, characterized in that, It also includes a timing control circuit, which is connected to at least two of the optoelectronic transceiver modules and is used to control at least two sets of lasers to emit light alternately in a time-division manner.

9. The single-chamber composite multi-laser reflector according to claim 1, characterized in that, The two sets of optoelectronic transceiver modules are non-centrally symmetrically distributed on the reflective cavity. The difference between the distance between the incident point of the two optical paths and the center of the reflective cavity is greater than 2mm, and the incident directions are not collinear.

10. A method for manufacturing a single-chamber composite multi-laser reflector, characterized in that, The single-chamber composite multi-laser reflector as described in any one of claims 1-9 comprises the following steps: The laser, detector, and optical path adjustment structure are initially installed; Adjust the position and angle of each component so that the minimum spatial intersection angle between the two laser beam paths formed in the reflective cavity is greater than 18 degrees, and the relative distance between the laser and the detector in the same group is greater than one-third of the maximum inner diameter of the reflective cavity. Based on the concentration of the gas to be detected, the circumferential orientation of the optical path adjustment structure in the horizontal plane is changed to adjust the propagation path of the laser beam and control the number of reflections and the effective optical path between the laser and the detector. The angle and position of the optical path adjustment structure are fixed; The laser is configured with the appropriate operating power based on the effective optical path of the beam.

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