Laser gas sensor suitable for industrial places

Abstract

The utility model provides a laser gas sensor suitable for industrial places, which comprises a shell, a laser and a detector are arranged in the shell, an optical cavity is further arranged in the shell, an optical path device is arranged in the optical cavity, and the optical path device is used for redirecting and gradually converging laser beams of the laser; the optical path device comprises a first off-axis parabolic mirror and a second off-axis parabolic mirror, the first off-axis parabolic mirror is used for redirecting laser beams of the laser and converging the laser beams into the optical cavity, and the second off-axis parabolic mirror is used for redirecting the laser beams of the laser into the optical cavity. And the second off-axis parabolic mirror is used for redirecting the laser beams in the optical cavity and converging the laser beams to the detector. The laser gas sensor suitable for the industrial place has the advantages of small size, high optical path volume ratio and low cost, and has good explosion-proof performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of laser gas detection sensor, specifically, a kind of laser gas sensor suitable for industrial site is involved. BACKGROUND

[0002] With the acceleration of industrialization, gas leakage accidents frequently occur in industrial sites, posing a serious threat to life and property safety. Gas detection sensors can detect potential risks in the environment and prevent accidents and environmental pollution in a timely manner.

[0003] The current popular gas detection sensors are mainly divided into semiconductor, catalytic combustion, electrochemical and infrared gas sensors. Semiconductor gas sensors work by causing a redox reaction between the gas and the surface of the semiconductor, which in turn causes the resistance of the sensitive element to change. The principle of catalytic combustion gas sensor is to make combustible gas burn through the action of catalyst, and then measure the heat generated by the reaction to detect gas concentration. Electrochemical gas sensor is a sensor that detects gas by generating an electrical signal through a chemical reaction. These sensors can meet the detection requirements in application, but they have limitations such as long response time, poor selectivity, high power consumption and poor stability. In comparison, infrared gas sensors can quickly and accurately identify target gases without the need for irreversible chemical reactions or combustion reactions when detecting gas concentration using infrared light. This method has high sensitivity, strong selectivity and fast response speed, and the sensor can be reused, so the maintenance requirements of the equipment are low.

[0004] Laser light source has good monochromaticity, strong directivity and stable wavelength, and gradually becomes the ideal light source choice in infrared gas sensor. Because laser has very narrow spectral line width, it can provide high-resolution spectral characteristics, so that the sensor can more accurately detect the absorption characteristics of the gas at a specific wavelength, perform high-sensitivity absorption detection, and is not easily disturbed by other gases. In addition, due to the high efficiency of laser light source, compared with traditional light source, laser gas sensor can work with high performance under low power consumption, suitable for portable or long-time use equipment.

[0005] Currently, the overall size, test accuracy and overall cost-effectiveness of laser gas sensors in industrial production are increasingly demanding, which requires laser gas sensors to have a higher optical path volume ratio and a simplified modular design. The ratio of the effective optical path of the laser beam absorbed by the gas in the sensor to the overall volume of the optical cavity is called the optical path volume ratio, which is a key performance indicator in laser gas sensors. Under the same volume, the larger the optical path volume ratio, the stronger the gas absorption, thereby improving the test accuracy of the sensor.

[0006] Some existing laser gas sensors, such as the diffusion type spectral absorption methane probe with explosion-proof performance disclosed in Chinese invention patent CN202010731368.0, need to integrate a fiber collimator and a focusing lens in the probe, and the laser beam needs to propagate between the front and rear ends of the sensor, thus resulting in a large overall size, a short effective optical path, a low optical path volume ratio, and a high cost of the laser gas sensor; the laser methane gas sensor disclosed in Chinese invention patent CN201711484462.5 also needs the laser beam to propagate between the front and rear ends of the sensor, and although it has a long effective optical path, the overall volume of the optical cavity of the sensor is large, resulting in a low optical path volume ratio.

[0007] In order to solve the above problems, people have been seeking an ideal technical solution. Content of the utility model

[0008] The utility model discloses a laser gas sensor suitable for industrial sites, which has the advantages of small volume, high optical path volume ratio and low cost, and is used for improving the problems of short optical path and large optical cavity volume that exist universally in the prior art, and the problem of large overall volume.

[0009] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of: including the casing, the laser and the detector are equipped in the casing, the optical cavity is also equipped in the casing, the optical path device is equipped in the optical cavity, and the optical path device is used for redirecting and gradually converging the laser beam of the laser; the optical path device includes the first off-axis parabolic mirror and the second off-axis parabolic mirror, the first off-axis parabolic mirror is used for redirecting and converging the laser beam of the laser into the optical cavity, and the second off-axis parabolic mirror is used for redirecting and converging the laser beam in the optical cavity to the detector.

[0010] Based on the above, the optical path device also includes a spherical mirror, which is used for redirecting and further gradually converging the laser beam in the optical cavity.

[0011] Based on the above, the spherical mirror includes a first spherical mirror, a second spherical mirror and a third spherical mirror; the first off-axis parabolic mirror, the first spherical mirror, the second spherical mirror, the third spherical mirror and the second off-axis parabolic mirror are used for redirecting and gradually converging the laser beam of the laser in sequence.

[0012] Based on the above, the second spherical mirror is arranged between the first off-axis parabolic mirror and the second off-axis parabolic mirror, the first spherical mirror is arranged opposite to the first off-axis parabolic mirror, the third spherical mirror is arranged opposite to the second off-axis parabolic mirror, and the optical path device is used for forming an M-shaped light path of the laser beam in the optical cavity.

[0013] Based on the above, the optical base is fixedly arranged in the shell, an inner cavity of the optical base forms the optical cavity, the optical base is provided with a ventilation hole communicating with the optical cavity, the ventilation hole is arranged at the front end port of the shell, and the optical cavity is communicated with the outside through the ventilation hole.

[0014] Based on the above, the fixing seat is arranged in the shell, the optical base is fixedly arranged between the fixing seat and the shell, and the fixing seat is provided with a laser hole and a detector hole communicating with the optical cavity.

[0015] Based on the above, the laser and the detector are vertically directed to the front end port of the shell through the laser hole and the detector hole respectively, and the first off-axis parabolic mirror and the second off-axis parabolic mirror are used for vertically redirecting the laser beam.

[0016] Based on the above, the fixing seat is provided with a signal processing module, the laser and the detector are electrically connected with the signal processing module, the signal processing module is provided with a cable, the cable passes through the rear end port of the shell, the rear end port of the shell is filled with an insulating explosion-proof sealant, and the cable is arranged in the insulating explosion-proof sealant.

[0017] Based on the above, the shell comprises a front shell and a rear shell, the front shell and the rear shell are threadedly connected, and the fixing seat and the front shell are threadedly connected.

[0018] Based on the above, the front end port of the shell is fixedly provided with an explosion-proof sheet, and the ventilation hole is communicated with the outside through the explosion-proof sheet.

[0019] Compared with the prior art, the laser gas sensor suitable for an industrial site has substantial characteristics and progress, specifically, the gradually converging effect of the optical path device can avoid the use of auxiliary devices such as a shaping lens and a collimation device, and is beneficial to reducing the overall volume of the sensor; the redirecting effect of the off-axis parabolic mirror ensures the position flexibility among the laser, the detector and the optical cavity, so that the laser beam can be more flexibly redirected in the detector without propagating between the front end and the rear end of the sensor, thereby providing a structural basis for miniaturization of the optical cavity and improvement of an effective optical path, effectively improving the optical path volume ratio, and making the overall size of the sensor compact.

[0020] Moreover, the redirection of the off-axis parabolic mirror and the spherical mirror makes the laser detection light path in the optical cavity form an M-shaped light path, effectively increases the optical path length, significantly improves the optical path volume ratio of the optical cavity, and also realizes the miniaturization of the optical cavity; the overall structure of the sensor uses a simplified modular design, is compact and small in size, adopts high-performance-price ratio components, has lower cost and higher durability; and through the use of explosion-proof measures such as explosion-proof shell, explosion-proof sheet, and insulating explosion-proof sealant, the sensor meets strict industrial explosion-proof standards, effectively avoids the explosion risk of the equipment in the industrial site, and ensures the safe use of the sensor in the dangerous environment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the overall structure of the utility model;

[0022] Figure 2 is an exploded view of the overall structure of the utility model;

[0023] Figure 3 is an exploded view of the overall structure of the utility model from another angle;

[0024] Figure 4 is a perspective view of the optical base of the utility model;

[0025] Figure 5 is a top view of the optical base of the utility model;

[0026] In the drawings, the reference signs are: optical base 1, optical cavity 101, air hole 102, first off-axis parabolic mirror 11, first spherical mirror 12, second spherical mirror 13, third spherical mirror 14, and second off-axis parabolic mirror 15; shell 2, front shell 21, and rear shell 22; laser 3; detector 4; fixing seat 5, fixing cavity 501, laser through hole 502, and detector through hole 503; explosion-proof sheet 6; signal processing module 7, cable 71; and insulating explosion-proof sealant 8. DETAILED DESCRIPTION

[0027] The technical solutions of the utility model will be described in further detail below through specific embodiments.

[0028] Example 1

[0029] As Figures 1-5As shown, the laser gas sensor suitable for industrial sites of the embodiment comprises a shell 2, a laser 3 and a detector 4 are arranged in the shell 2, the laser 3 emits a laser beam as a light source, the detector 4 adopts a photoelectric detector to collect and convert the laser signal of the laser beam of the laser 3 for subsequent gas detection and analysis; the shell 2 is also provided with an optical cavity 101, the laser 3 and the detector 4 are directed to the optical cavity 101, and the optical cavity 101 is communicated with the outside; after the target gas in the outside enters the optical cavity 101 in the shell 2, the laser beam of the laser 3 passes through the target gas in the optical cavity 101 and is detected by the detector 4, and then the sensor can detect the target gas.

[0030] The optical path device is arranged in the optical cavity 101, and is used for redirecting and gradually converging the laser beam of the laser 3. The optical path device makes the laser beam of the laser 3 be detected by the detector 3 after being redirected for multiple times in the optical cavity 101, and plays a role of increasing the effective optical path of the laser beam. The ratio of the effective optical path of the laser beam absorbed by the gas in the sensor to the overall volume of the optical cavity 101 is called the optical path volume ratio, which is a key performance indicator in the laser gas sensor. In the same volume, the greater the optical path volume ratio, the stronger the gas absorption, so as to improve the test accuracy of the sensor.

[0031] In addition, the optical path device makes the laser beam of the laser 3 gradually converge in the process of being redirected for multiple times, and the laser 3 can be free of auxiliary devices such as a shaping lens and a collimation device, which is conducive to reducing the overall volume of the sensor. The laser 3 can use a TO package laser with lower cost, so that the laser 3 has a compact size and lower cost. The gradual convergence of the laser beam also makes the detection of the detector 4 more accurate and has a compact size.

[0032] Specifically, the optical path device comprises a first off-axis parabolic mirror 11 and a second off-axis parabolic mirror 15. The first off-axis parabolic mirror 11 is used for redirecting and converging the laser beam of the laser 3 into the optical cavity 101, and the second off-axis parabolic mirror 15 is used for redirecting and converging the laser beam in the optical cavity 101 to the detector 4. In this way, through the redirection of the first off-axis parabolic mirror 11 and the second off-axis parabolic mirror 15, the positions of the laser 3, the detector 4 and the optical cavity 101 arranged in the shell 2 can be more flexible, which is conducive to reducing the overall volume of the sensor and increasing the optical path volume ratio. Moreover, the first off-axis parabolic mirror 11 and the second off-axis parabolic mirror 15 in the embodiment play a role of converging the laser beam of the laser 3 twice, so as to make the laser beam gradually converge.

[0033] Therefore, the optical path device in the optical cavity 101 can make the sensor have a more compact volume and lower cost through the redirection and gradual convergence of the laser beam.

[0034] Embodiment 2

[0035] Based on Embodiment 1, the optical path device further comprises a plane mirror, which is arranged in the optical cavity 101 and is used to redirect the laser beam between the first off-axis parabolic mirror 11 and the second off-axis parabolic mirror 15 to increase the effective optical path of the laser beam; the plane mirror cannot converge the laser beam, but can continue the converging effect of the first off-axis parabolic mirror 11 in the process of reflection.

[0036] Embodiment 3

[0037] Based on Embodiment 1, the optical path device further comprises a spherical mirror, which is used to redirect the laser beam in the optical cavity 101 and further gradually converge the laser beam in the optical cavity 101.

[0038] Specifically, the spherical mirror is arranged in the optical cavity 101 and is used to redirect the laser beam between the first off-axis parabolic mirror 11 and the second off-axis parabolic mirror 15 to increase the effective optical path of the laser beam; while redirecting the laser beam, the spherical mirror can further converge the laser beam in the optical cavity 101 on the basis of the converging effect of the first off-axis parabolic mirror 11.

[0039] The spherical mirror in this embodiment comprises a first spherical mirror 12, a second spherical mirror 13 and a third spherical mirror 14; the first off-axis parabolic mirror 11, the first spherical mirror 12, the second spherical mirror 13, the third spherical mirror 14 and the second off-axis parabolic mirror 15 are used to redirect and converge the laser beam in sequence; wherein the second spherical mirror 13 is arranged between the first off-axis parabolic mirror 11 and the second off-axis parabolic mirror 15, the first spherical mirror 12 is arranged opposite to the first off-axis parabolic mirror 11, the third spherical mirror 14 is arranged opposite to the second off-axis parabolic mirror 15, and the optical path device is used to form an M-shaped light path for the laser beam in the optical cavity 101.

[0040] In the M-shaped light path, the requirements for the reflection angles of the first spherical mirror 12, the second spherical mirror 13 and the third spherical mirror 14 are relatively small, so the optical cavity 101 can be arranged to have a smaller volume, which is beneficial to increasing the optical path volume ratio of the laser beam while reducing the volume and increasing the effective optical path.

[0041] In actual application, the five redirections in the M-shaped light path and the gradual converging effect in the redirections can make the coupling efficiency of the laser beam reach more than 40%.

[0042] As Figure 5As shown, the first spherical mirror 12 and the third spherical mirror 14 are provided with isolation plates, and the second spherical mirror 13 is arranged in a groove between the first off-axis parabolic mirror 11 and the second off-axis parabolic mirror 15, so that the M-shaped light path reduces stray light interference when the laser beam is redirected.

[0043] The related mirror surfaces of the optical path devices in Embodiments 1, 2 and 3 are all coated with a reflective film layer.

[0044] Embodiment 4

[0045] Based on the above-mentioned Embodiment 1 or Embodiment 2 or Embodiment 3, the optical base 1 is fixedly arranged in the shell 2, the inner cavity of the optical base 1 forms an optical cavity 101, the optical path device is arranged in the optical cavity 101 on the optical base 1, the optical base 1 is provided with a ventilation hole 102 communicating with the optical cavity 101, the ventilation hole 102 is arranged at the front end port of the shell 2, the optical cavity 101 is communicated with the outside through the ventilation hole 102, and the target gas enters the optical cavity 101 from the front end port of the shell 2 through the ventilation hole 102.

[0046] The material of the optical base 1 can be high-strength engineering plastic with stable size at high and low temperatures, which is beneficial to reduce cost and improve durability.

[0047] In order to stably fix the optical base 1 in the shell 2, the shell 2 is provided with a fixing seat 5, and the optical base 1 is fixedly arranged between the fixing seat 5 and the front end of the shell 2. Preferably, the fixing seat 5 is provided with a fixing cavity 501, and the optical base 1 is embedded in the fixing cavity 501. The optical base 1 is also clamped and fixed by the fixing seat 5 and the shell 2, so that the optical base 1 can be stably arranged in the shell 2.

[0048] The fixing seat 5 is provided with a laser hole 502 and a detector hole 503 communicating with the optical cavity 101, and the laser 3 and the detector 4 are respectively directed to the optical cavity 101 through the laser hole 502 and the detector hole 503. The laser beam of the laser 3 enters the optical cavity 101 and is redirected and converged by the first off-axis parabolic mirror 11, and is finally redirected and converged to the detection surface of the detector 4 by the second off-axis parabolic mirror 15.

[0049] Embodiment 5

[0050] Based on Embodiment 4, as a preferred embodiment, the laser hole 502 and the detector hole 503 are respectively arranged at opposite sides of the optical base 1 relative to the front end port of the shell 2, the laser hole 502 and the detector hole 503 are communicated with the optical cavity 101 from one side of the optical base 1, and the ventilation hole 102 is communicated with the optical cavity 102 from the opposite side of the optical base 1.

[0051] In this embodiment, the laser through hole 502 and the detector through hole 503 are vertically oriented to the front end port of the shell 2, and the laser 3 and the detector 4 are respectively vertically oriented to the front end port of the shell 2 through the laser through hole 502 and the detector through hole 503; at the same time, the first off-axis parabolic mirror 11 vertically redirects the laser beam of the laser 3 into the optical cavity 101, and the second off-axis parabolic mirror 15 vertically redirects the laser beam in the optical cavity 101 to the detection surface of the detector 4, so that the laser beam propagates in the optical cavity 101 in a direction parallel to the front end port of the shell 2, such as the M-shaped light path in embodiment 3, which is parallel to the front end port of the shell 2. Thus, the length between the two end ports of the shell 2 can be effectively controlled, the width space between the two end ports of the shell 2 can be effectively utilized, and the overall volume of the sensor can be greatly reduced under the premise of ensuring the volume ratio of the optical path.

[0052] Embodiment 6

[0053] Based on embodiment 4, an explosion-proof sheet 6 is arranged at the front end port of the shell 2, an insulating explosion-proof sealant is arranged at the rear end port of the shell 2, and the shell 2 and other related components are arranged as explosion-proof components, so that the overall sensor meets strict industrial explosion-proof standards, effectively avoiding the explosion risk of the equipment in industrial places, and ensuring the safe use of the equipment in dangerous environments.

[0054] The shell 2 includes a front shell 21 and a rear shell 22, and the shell 2 is arranged in a cylindrical shape. The front shell 21 and the rear shell 22 are threadedly connected. Preferably, the front shell 21 and the rear shell 22 are connected and fastened by a threaded explosion-proof joint surface, and are made of aluminum alloy or stainless steel, so that the shell 2 has good protection performance and effectively reduces cost and improves durability. The fixing seat 5 is threadedly connected with the front shell 21, so that the fixing seat 5 can be stably arranged in the shell 2.

[0055] The explosion-proof sheet 6 is fixedly arranged at the front end port of the shell 2 (i.e. the port of the front shell 21), and the air hole 102 is communicated with the outside through the explosion-proof sheet 6. The explosion-proof sheet 6 can be fixedly arranged at the front end port of the shell 2 by interference fit, such as being pressed into the shell 2, to ensure that there is no gap between the explosion-proof sheet 6 and the front end port of the shell 2. The explosion-proof sheet 6 can also be clamped at the front end port by the fixing seat 5 and the shell 2 to ensure the stable fixation of the explosion-proof sheet 6. The explosion-proof sheet 6 is used to block possible explosions and combustion, and forms an explosion-proof barrier.

[0056] The signal processing module 7 is fixedly arranged on the fixed seat 5, and is used for processing the laser signal received by the detector 4, converting the laser signal into identifiable gas concentration data, and outputting a signal to the outside; the signal processing module 7 can be fixedly arranged on the fixed seat 5 by using a screw, the laser 3 and the detector 4 are electrically connected with the signal processing module 7, and the end portions of the laser 3 and the detector 4 can be fixedly arranged on the signal processing module 7; the signal processing module 7 is provided with a cable 71, the cable 71 passes through the rear end port of the shell 2, the rear end port of the shell 2 (namely, the port of the rear shell 22) is filled with insulating explosion-proof sealant 8, and the cable 71 is arranged in the insulating explosion-proof sealant 8; the insulating explosion-proof sealant 8 can adopt rubber sealant or resin sealant, such as epoxy resin sealant, and effectively completes insulation, fixation and protection while having relatively low cost. The insulating explosion-proof sealant 8 ensures the airtightness and protection performance of the inside of the optical sensor, and prevents the influence of external environmental factors on the sensor.

[0057] The laser gas sensor suitable for an industrial site has the gradually converging effect of the light path device, and can be free of auxiliary devices such as a shaping lens and a collimation device, and also does not need an external laser, thereby being beneficial to reducing the overall volume of the sensor; the redirecting effect of the off-axis parabolic mirror ensures the position flexibility among the laser 3, the detector 4 and the optical cavity 101, so that the laser beam can be more flexibly redirected in the detector, without needing to propagate between the front end and the rear end of the sensor, thereby providing a basis for miniaturization of the optical cavity 101, and enabling the overall size of the sensor to be designed to be compact; the redirecting effect of the off-axis parabolic mirror and the spherical mirror enables the laser detection light path in the optical cavity 101 to form an M-shaped light path, effectively increases the light path length, significantly improves the light path volume ratio of the optical cavity 101, and also realizes miniaturization of the optical cavity 101; the overall structure of the sensor uses a simplified modular design, has compact and small size, adopts high-performance-price ratio components, and has relatively low cost and relatively high durability; and through adoption of explosion-proof measures such as the explosion-proof shell 2, the explosion-proof sheet 6 and the insulating explosion-proof sealant 8, the sensor meets strict industrial explosion-proof standards, effectively avoids the explosion risk of the equipment in the industrial site, and ensures safe use of the sensor in a dangerous environment.

[0058] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application rather than limit them; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed.

Claims

1. A laser gas sensor suitable for use in an industrial setting, characterized in that, The application relates to a laser detector, which comprises a shell (2), a laser (3) and a detector (4) arranged in the shell (2), an optical cavity (101) arranged in the shell (2), and an optical path device arranged in the optical cavity (101) and used for redirecting and gradually converging a laser beam of the laser (3); the optical path device comprises a first off-axis parabolic mirror (11) and a second off-axis parabolic mirror (15), the first off-axis parabolic mirror (11) is used for redirecting and converging the laser beam of the laser (3) into the optical cavity (101), and the second off-axis parabolic mirror (15) is used for redirecting and converging the laser beam in the optical cavity (101) to the detector (4).

2. The laser gas sensor suitable for use in an industrial site according to claim 1, characterized in that, The optical path device further comprises a spherical mirror used for redirecting and further gradually converging the laser beam in the optical cavity (101).

3. The laser gas sensor suitable for use in an industrial site according to claim 2, characterized in that, The spherical mirror comprises a first spherical mirror (12), a second spherical mirror (13) and a third spherical mirror (14); the first off-axis parabolic mirror (11), the first spherical mirror (12), the second spherical mirror (13), the third spherical mirror (14) and the second off-axis parabolic mirror (15) are sequentially used for redirecting and gradually converging the laser beam of the laser (3).

4. The laser gas sensor suitable for use in an industrial site according to claim 3, characterized in that, The second spherical mirror (13) is arranged between the first off-axis parabolic mirror (11) and the second off-axis parabolic mirror (15), the first spherical mirror (12) is arranged opposite to the first off-axis parabolic mirror (11), the third spherical mirror (14) is arranged opposite to the second off-axis parabolic mirror (15), and the optical path device is used for forming an M-shaped light path of the laser beam in the optical cavity (101).

5. Laser gas sensor suitable for use in an industrial site according to any one of claims 1-4, characterized in that, An optical base (1) is fixedly arranged in the shell (2), an inner cavity of the optical base (1) forms the optical cavity (101), the optical base (1) is provided with a ventilation hole (102) communicating with the optical cavity (101), the ventilation hole (102) is arranged at a front end port of the shell (2), and the optical cavity (101) is communicated with the outside through the ventilation hole (102).

6. The laser gas sensor suitable for use in an industrial site according to claim 5, characterized in that, A fixing seat (5) is arranged in the shell (2), the optical base (1) is fixedly arranged between the fixing seat (5) and the shell (2), and the fixing seat (5) is provided with a laser hole (502) and a detector hole (503) communicating with the optical cavity (101).

7. The laser gas sensor suitable for use in an industrial site according to claim 6, characterized in that, The laser (3) and the detector (4) are vertically directed to the front end port of the shell (2) through the laser hole (502) and the detector hole (503) respectively, and the first off-axis parabolic mirror (11) and the second off-axis parabolic mirror (15) are used for vertically redirecting the laser beam.

8. The laser gas sensor suitable for use in an industrial site according to claim 6, characterized in that, The fixed seat (5) is provided with a signal processing module (7), the laser (3) and the detector (4) are electrically connected with the signal processing module (7), the signal processing module (7) is provided with a cable (71), the cable (71) passes through the rear end port of the shell (2), the rear end port of the shell (2) is filled with insulating explosion-proof sealant (8), and the cable (71) is arranged in the insulating explosion-proof sealant (8).

9. The laser gas sensor suitable for use in an industrial site according to claim 6, characterized in that, The shell (2) comprises a front shell (21) and a rear shell (22), the front shell (21) and the rear shell (22) are threadedly connected, and the fixed seat (5) and the front shell (21) are threadedly connected.

10. The laser gas sensor suitable for use in an industrial site according to claim 5, characterized in that, An explosion-proof sheet (6) is fixedly arranged at the front end port of the shell (2), and the ventilation hole (102) is communicated with the outside through the explosion-proof sheet (6).

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