Infrared gas cloud imager for VOC gas monitoring

Abstract

The invention belongs to the technical field of hazardous chemical gas leakage monitoring, and discloses an infrared gas cloud imager for VOC gas monitoring, the infrared gas cloud imager comprises a shell, the front end is connected with an optical window, and a spectral imaging module, a light splitting module, a power supply module, an information acquisition and processing module and a TEC refrigeration module are arranged in the shell; the spectral imaging module is located between the optical window and the light splitting module, target gas penetrates through the optical window, is imaged through the spectral imaging module and then irradiates the light splitting module, and the light splitting module is provided with a plurality of light filtering units with different wave bands; the information acquiring and processing module is used for transmitting data acquired from the spectral imaging module to an external computer; the TEC refrigeration module is in contact with the spectral imaging module and is used for reducing background radiation; and the power module is used for providing power. The VOC gas leakage monitoring system is high in integration level, strong in anti-interference capability, high in sensitivity, good in environmental adaptability, low in cost and capable of monitoring VOC gas leakage.

Description

Technical Field

[0001] This invention belongs to the field of hazardous chemical gas leak monitoring technology, and particularly relates to an infrared gas cloud imager for VOC gas monitoring. Background Technology

[0002] In recent years, explosions and poisonings caused by VOC gas leaks have occurred frequently, seriously threatening human life and environmental safety. The core needs of gas leak detection technology research and development focus on: rapid leak detection, accurate assessment of gas spatial distribution and diffusion trends, and accurate location of leak sources in order to take timely emergency measures.

[0003] With the development of thermal infrared passive imaging technology, infrared imaging detection technology for hazardous gas leaks has become the mainstream technology due to its advantages such as "high efficiency, long distance, large range, and dynamic intuitiveness." This type of technology is mainly divided into two categories: active imaging (based on laser light source radiation absorption) and passive imaging (based on background radiation absorption). Among them, passive spectral imaging technology is more suitable for dynamic leak monitoring due to its advantages of "rapid imaging and traceable diffusion patterns," but existing technologies still have significant shortcomings: Lack of dedicated systems: Existing gas leak imaging mostly uses general infrared detectors, combined with basic image processing to improve detection capabilities, but cooled detectors can only detect a single gas form and cannot perform concentration analysis; Multi-element detection is difficult: gas monitoring requires the simultaneous acquisition of "type, form, and concentration", which is difficult to achieve with existing technologies, especially in detecting multiple gases with infrared characteristic absorption peaks that are far apart. Insufficient sensitivity: Passive spectral imaging technology has lower sensitivity than active laser methods, and needs to be improved through optical optimization and algorithm improvement; Poor image processing targeting: Existing algorithms treat gas infrared images as ordinary infrared images, only performing noise suppression and target detection, without combining gas cloud features (shape, concentration distribution, diffusion motion) for optimization.

[0004] In summary, existing VOC gas monitoring methods cannot meet the "multi-factor, high stability, and low cost" requirements of high-risk scenarios.

[0005] Therefore, there is an urgent need for an infrared gas cloud imager for VOC gas monitoring to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an infrared gas cloud imager for VOC gas monitoring, so as to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides an infrared gas cloud imager for VOC gas monitoring, comprising: The housing has an optical window sealed at the front end, and the housing contains a spectral imaging module, a beam splitting module, a power supply module, an information acquisition and processing module, and a TEC cooling module. The spectral imaging module is located between the optical window and the beam splitting module. The target gas passes through the optical window, is imaged by the spectral imaging module, and then illuminates the beam splitting module. The beam splitting module is provided with multiple filter units of different wavelengths. The information acquisition and processing module is used to transmit the data acquired from the spectral imaging module to an external computer. The TEC cooling module is positioned in contact with the spectral imaging module to reduce background radiation; The power supply module is used to provide power to the spectral imaging module, the spectroscopic module, the information acquisition and processing module, and the TEC cooling module.

[0008] The present invention provides an infrared gas cloud imager for VOC gas monitoring. The optical window includes a window cover, which is fixedly connected to the front end of the housing. A protective window is installed inside the window cover by a window pressure ring. A window sealing gasket is provided between the window cover and the housing, and the window sealing gasket is fixedly connected to the window cover.

[0009] The present invention provides an infrared gas cloud imager for VOC gas monitoring. The spectral imaging module includes a fixed base plate fixedly connected to the housing. A copper sheet is fixedly connected to the front end of the fixed base plate through a heat insulation column. A fixing plate is fixedly connected to the rear end of the fixed base plate. An infrared lens is mounted on the copper sheet. An infrared detector is mounted on the fixing plate. The infrared lens is located between the infrared detector and the optical window.

[0010] The present invention provides an infrared gas cloud imager for VOC gas monitoring. The beam splitting module includes a filter wheel assembly and a motor assembly. The motor assembly is fixedly connected to the top of the fixed base plate, and the filter wheel assembly is fixedly connected to the rotation shaft of the motor assembly. The filter wheel assembly is located between the infrared detector and the infrared lens, and the motor assembly is used to drive the filter wheel assembly to rotate.

[0011] The present invention provides an infrared gas cloud imager for VOC gas monitoring. The filter wheel assembly includes a filter wheel with multiple mounting holes evenly spaced along the circumference. The filter unit includes a filter, which is mounted in the mounting hole by a filter retainer ring. The transmission bands of the multiple filters are all different.

[0012] The present invention provides an infrared gas cloud imager for VOC gas monitoring. The motor assembly includes a power drive module, the power drive module includes a support, which is fixedly connected to the top of the fixed base plate. A gearbox is fixedly connected to the top of the support. A stepper motor is mounted on the gearbox. A position measurement module and a position indication module are mounted on the stepper motor.

[0013] This invention provides an infrared gas cloud imager for VOC gas monitoring. The TEC cooling module includes a heat sink plate fixedly connected to the bottom of the housing. A heat-conducting block is fixedly connected to the top of the heat sink plate via a heat-conducting block bracket. A TEC cooler is fixedly connected to the top of the heat-conducting block bracket. A TEC mounting plate is fixedly connected to the fixed base plate. The TEC cooler is fixedly connected to the fixed base plate via the TEC mounting plate and is in contact with the infrared lens. A bottom sealing gasket is provided between the heat sink plate and the housing, and the bottom sealing gasket is fixedly connected to the heat sink plate.

[0014] The present invention provides an infrared gas cloud imager for VOC gas monitoring. The power module includes a DC-DC module and a filter. A power supply port and a power button are provided at the rear end of the housing. The power supply port and the power button are respectively connected to the filter. The filter is used to filter the ripple noise generated by the DC-DC module. The spectral imaging module, the spectroscopic module, and the information acquisition and processing module are all connected to the DC-DC module.

[0015] This invention provides an infrared gas cloud imager for VOC gas monitoring. The information acquisition and processing module includes an FPGA module, a detector driver module, a data cache and storage module, a communication and data transmission module, and a temperature measurement module. A gigabit network transmission port is provided at the rear end of the housing. The beam splitting module, the TEC cooling module, the detector driver module, the data cache and storage module, the communication and data transmission module, the temperature measurement module, and the gigabit network transmission port are respectively connected to the FPGA module. The detector driver module is connected to the infrared detector.

[0016] The present invention provides an infrared gas cloud imager for VOC gas monitoring, wherein the housing is filled with nitrogen gas.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: This invention provides an infrared gas cloud imager for VOC gas monitoring. In use, the target gas within the monitoring field of view passes through an optical window, is imaged by a spectral imaging module, and then illuminates the filter unit of a spectroscopic module. Under pulse triggering, the spectral imaging module acquires spectral data for each spectral channel corresponding to different filter units. An information acquisition and processing module buffers and transmits the spectral data to an external data processor. An external computer uses monitoring algorithms, combined with multi-channel spectral data, to achieve target imaging monitoring of the gas, including gas type identification, concentration calculation, and leak point location. This invention, through multiple band filter units and real-time temperature correction, can invert gas composition, concentration, leak point location, and diffusion trend, solving the pain point of single-detection, suppressing background radiation, and eliminating the need for frequent black plate correction. This invention features high integration, strong anti-interference capability, high sensitivity, good environmental adaptability, and low cost, enabling rapid, intuitive, and visual monitoring of VOC gas leaks. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the front end face of the housing of the present invention; Figure 2 This is a schematic diagram of the rear end face of the housing of the present invention; Figure 3 This is an exploded view of the shell structure of the present invention; Figure 4 This is a schematic diagram of the optical window structure of the present invention; Figure 5 This is a schematic diagram of the spectral imaging module structure of the present invention; Figure 6 This is a schematic diagram of the beam splitting module structure of the present invention; Figure 7 This is a schematic diagram of the filter wheel assembly structure of the present invention; Figure 8 This is a schematic diagram of the motor assembly structure of the present invention; Figure 9 This is a schematic diagram of the TEC refrigeration module structure of the present invention; Figure 10 This is a schematic diagram showing the connection of the information acquisition and processing module of the present invention; The components include: 1. Optical window; 11. Window sealing gasket; 12. Window cover; 13. Protective window; 14. Window retaining ring; 2. Housing; 3. Spectral imaging module; 31. Fixing base plate; 32. Infrared lens; 33. Copper sheet; 34. Infrared detector; 35. Fixing plate; 36. Heat insulation column; 37. TEC mounting plate; 4. Spectrometer module; 41. Filter wheel assembly; 411. Filter wheel; 412. Filter; 413. Filter retaining ring; 42. Motor assembly; 421. Position measurement module; 4211. Photoelectric switch; 4212. Encoder. 422 Power drive module; 4221 Stepper motor; 4222 Gearbox; 4223 Support; 423 Position indicator module; 5 Power supply module; 6 Information acquisition and processing module; 61 FPGA module; 62 Detector drive module; 63 Data buffer and storage module; 64 Communication and data transmission module; 7 TEC cooling module; 71 TEC cooler; 72 Heat conduction block; 73 Heat conduction block bracket; 74 Bottom sealing gasket; 75 Heat sink; 8 Gigabit Ethernet transmission port; 9 Power supply port; 10 Power button. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figures 1-10 This invention provides an infrared gas cloud imager for VOC gas monitoring, comprising: The housing 2 has an optical window 1 sealed at the front end. Inside the housing 2 are a spectral imaging module 3, a beam splitting module 4, a power supply module 5, an information acquisition and processing module 6, and a TEC cooling module 7. The spectral imaging module 3 is located between the optical window 1 and the beam splitting module 4. The target gas passes through the optical window 1 and is imaged by the spectral imaging module 3 before being irradiated onto the beam splitting module 4. The beam splitting module 4 is equipped with multiple filter units of different wavelengths. The information acquisition and processing module 6 is used to transmit the data acquired from the spectral imaging module 3 to an external computer; The TEC cooling module 7 is positioned in contact with the spectral imaging module 3 to reduce background radiation; Power module 5 is used to provide power to spectral imaging module 3, spectroscopic module 4, information acquisition and processing module 6 and TEC cooling module 7.

[0023] In one embodiment of the present invention, during use, the target gas within the monitoring field of view passes through the optical window 1, is imaged by the spectral imaging module 3, and then illuminates the filter unit of the beam splitting module 4. Under pulse triggering, the spectral imaging module 3 acquires the spectral data of each spectral channel corresponding to different filter units. The information acquisition and processing module 6 caches and transmits the spectral data to an external data processor. The external computer uses monitoring algorithms, combined with multi-channel spectral data, to realize target imaging monitoring of the gas, including gas type identification, concentration calculation, and leak point location.

[0024] In one embodiment of the present invention, the housing 2 is made of aluminum alloy, which is lightweight and has good heat dissipation, making it suitable for harsh outdoor and factory environments.

[0025] As an optional implementation, the optical window 1 includes a window cover 12, which is fixedly connected to the front end of the housing 2. A protective window 13 is installed inside the window cover 12 through a window pressure ring 14. A window sealing gasket 11 is provided between the window cover 12 and the housing 2, and the window sealing gasket 11 is fixedly connected to the window cover 12.

[0026] In one embodiment of the present invention, the protective window 13 is an optical window that can transmit long-wave infrared radiation, preferably with a transmission band range of 7.0-14μm.

[0027] As an optional implementation, the spectral imaging module 3 includes a fixed base plate 31, which is fixedly connected inside the housing 2. A copper sheet 33 is fixedly connected to the front end of the fixed base plate 31 through a heat insulation column 36, and a fixed buckle plate 35 is fixedly connected to the rear end of the fixed base plate 31. An infrared lens 32 is installed on the copper sheet 33, and an infrared detector 34 is installed on the fixed buckle plate 35. The infrared lens 32 is located between the infrared detector 34 and the optical window 1.

[0028] In one embodiment of the present invention, the infrared lens 32 and the infrared detector 34 are optically calibrated and then mounted together on the fixed base plate 31, wherein: the infrared lens 32 is a long-wave infrared lens with an F number of 1; the infrared detector 34 is an uncooled long-wave infrared array detector; the copper sheet 33 is used to assist in heat conduction, and the heat insulation column 36 is used to reduce the transfer of external heat.

[0029] As an optional implementation, the beam splitting module 4 includes a filter wheel assembly 41 and a motor assembly 42. The motor assembly 42 is fixedly connected to the top of the fixed base plate 31, and the filter wheel assembly 41 is fixedly connected to the rotation shaft of the motor assembly 42. The filter wheel assembly 41 is located between the infrared detector 34 and the infrared lens 32, and the motor assembly 42 is used to drive the filter wheel assembly 41 to rotate.

[0030] In one embodiment of the present invention, the filter wheel assembly 41 is fixedly connected to the rotating shaft of the motor assembly 42, and the motor assembly 42 drives the filter wheel assembly 41 to rotate at a constant speed to achieve multi-band spectrum switching.

[0031] As an optional implementation, the filter wheel assembly 41 includes a filter wheel 411, on which a plurality of mounting holes are equally spaced along the circumference. The filter unit includes a filter 412, which is mounted in the mounting hole through a filter retaining ring 413. The transmission bands of the plurality of filters 412 are all different.

[0032] In one embodiment of the present invention, the filter 412 can be configured with different gas absorption bands as required, preferably with 5 different transmission bands. Referring to Table 1, the filter retaining ring 413 is used to fix the filter 412 to prevent displacement from affecting the light transmission accuracy.

[0033] Table 1 Wavelength settings for each channel filter As an optional implementation, the motor assembly 42 includes a power drive module 422, which includes a support 4223 fixedly connected to the top of the fixed base plate 31. A gearbox 4222 is fixedly connected to the top of the support 4223. A stepper motor 4221 is mounted on the gearbox 4222. A position measurement module 421 and a position indication module 423 are mounted on the stepper motor 4221.

[0034] In one embodiment of the present invention, a stepper motor 4221 is used to control the rotation of the filter wheel assembly 41. The position measurement module 421 consists of a photoelectric switch 4211 and an encoder 4212. The photoelectric switch 4211 outputs a position identification signal of the first filter 412, and the encoder 4212 outputs the rotation angle of the filter wheel 411. The position indication module 423 outputs the drive signal required to drive the stepper motor 4221, and provides a real-time position indication of different filters 412 based on the angle output by the encoder 4212.

[0035] As an optional implementation, the TEC cooling module 7 includes a heat sink 75, which is fixedly connected to the bottom of the housing 2. A heat conduction block 72 is fixedly connected to the top of the heat sink 75 via a heat conduction block bracket 73. A TEC cooler 71 is fixedly connected to the top of the heat conduction block bracket 73. A TEC mounting plate 37 is fixedly connected to the base plate 31. The TEC cooler 71 is fixedly connected to the base plate 31 via the TEC mounting plate 37 and is in contact with the infrared lens 32. A bottom sealing gasket 74 is provided between the heat sink 75 and the housing 2, and the bottom sealing gasket 74 is fixedly connected to the heat sink 75.

[0036] In one embodiment of the present invention, the TEC cooler 71 is in close contact with the infrared lens 32 and is set to a temperature lower than the ambient temperature during operation to reduce background radiation introduced by the lens. Preferably, the temperature is set 5-10°C lower than the current ambient temperature. The heat conduction block 72 is used to conduct the heat from the TEC cooler 71 to the heat sink 75. The heat conduction block bracket 73 fixes the heat conduction block 72. The bottom sealing gasket 74 prevents external dust from entering. The specific temperature control stability is better than 0.2K / 30min. The heat sink 75 adopts an aluminum fin structure, combined with natural heat dissipation, to adapt to outdoor fanless scenarios.

[0037] As an optional implementation, the power module 5 includes a DC-DC module and a filter. The rear end of the housing 2 is provided with a power supply port 9 and a power button 10. The power supply port 9 and the power button 10 are respectively connected to the filter. The filter is used to filter the ripple noise generated by the DC-DC module. The spectral imaging module 3, the spectroscopic module 4, and the information acquisition and processing module 6 are connected to the DC-DC module.

[0038] In one embodiment of the present invention, the power supply module consists of a DC-DC module (not shown in the figure) and a filter (not shown in the figure). The filter is connected to the power button 10 and the power supply port 9 and is used to filter the ripple noise generated by the DC-DC module. The DC-DC module is connected to the spectral imaging module 3, the beam splitting module 4 and the information acquisition and processing module 6, and can output different voltages (such as 5V, 12V, 24V) to power the internal circuits of the spectral imaging module 3, the beam splitting module 4 and the information acquisition and processing module 6.

[0039] As an optional implementation, the information acquisition and processing module 6 includes an FPGA module 61, a detector driver module 62, a data cache and storage module 63, a communication and data transmission module 64, and a temperature measurement module. A gigabit network transmission port 8 is provided at the rear end of the housing 2. The beam splitting module 4, the TEC cooling module 7, the detector driver module 62, the data cache and storage module 63, the communication and data transmission module 64, the temperature measurement module, and the gigabit network transmission port 8 are respectively connected to the FPGA module 61, and the detector driver module 62 is connected to the infrared detector 34.

[0040] In one embodiment of the present invention, the FPGA module 61 is the main control module, providing the correct working timing for the operation of the gas cloud imager, and processing and transmitting the acquired image data; the detector drive module 62 is connected to the infrared detector 34 and the FPGA module 61, and acquires the spectral image data of the infrared detector 34 and transmits it to the FPGA module 61 according to the timing instructions of the FPGA module 61; the data buffer and storage module 63 is connected to the FPGA module 61, and buffers the spectral image data according to the instructions to prevent data loss; the communication and data transmission module 64 is connected to the FPGA module 61 and the gigabit network transmission port 8 on the rear side of the housing 2, and transmits the spectral data to an external working computer according to the instructions; the temperature measurement module (not shown in the figure) consists of temperature sensors installed on the infrared lens 32 and the fixed base plate 31 respectively and connected to the FPGA module 61, acquiring, storing and transmitting temperature signals in real time.

[0041] In one embodiment of the present invention, the FPGA module 61 adopts the Xilinx Kintex-7 series, which has a fast computing speed and supports real-time timing control and data processing; the temperature measurement module adopts the DS18B20 sensor with an accuracy of ±0.5℃ and supports real-time temperature correction.

[0042] As an optional implementation, the housing 2 is filled with nitrogen gas.

[0043] In one embodiment of the present invention, the entire housing 2 is filled with dry nitrogen to expel the internal air, thereby preventing water vapor in the air from condensing when the TEC cooling module 7 cools the optical components infrared lens 32 and filter 412.

[0044] In one embodiment of the present invention, taking VOC leakage monitoring in a petrochemical plant as an example, the working process is as follows: Preheating: Press the power button 10 on the back of the housing 2, the power module 5 starts, the TEC cooling module 7 starts working, and the temperature of the infrared lens 32 drops to 0℃. The temperature measurement module monitors the temperature in real time. After the temperature stabilizes and the temperature fluctuation is ≤0.2K / 30min, the device enters standby mode. Spectral acquisition: The motor assembly 42 drives the filter wheel 411 to rotate at a constant speed of 10 revolutions per minute. When a filter 412 is aligned with the optical path, the photoelectric switch 4211 outputs a trigger pulse, and the infrared detector 34 acquires the spectral data of that band. For example, DN1 corresponds to the 7.5μm band. The data acquisition of 5 bands is completed in sequence. Data processing and transmission: The FPGA module 61 of the information acquisition and processing module 6 receives spectral data of 5 bands, performs preprocessing in combination with the temperature signal of the temperature measurement module to eliminate the influence of temperature drift, and after data buffering, transmits it to the external computer of the plant monitoring center through the gigabit network transmission port 8. Gas monitoring and analysis: An external computer runs a monitoring algorithm to compare multi-band spectral data with a standard VOC gas absorption spectrum library to identify the type of leaked gas, such as toluene. The concentration is inverted through spectral intensity, such as 200 ppm. The leak point is located by combining the imaging location and the diffusion trend is simulated through time-series data, such as diffusion to a range of 50 meters after 1 hour. Abnormal alarm: When the concentration exceeds the threshold such as 500ppm or the leak point is close to a densely populated area, the system will automatically trigger an audible and visual alarm to remind staff to take emergency measures.

[0045] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An infrared gas cloud imager for VOC gas monitoring, characterized in that, include: The housing (2) has an optical window (1) sealed at the front end. The housing (2) contains a spectral imaging module (3), a beam splitting module (4), a power supply module (5), an information acquisition and processing module (6), and a TEC cooling module (7). The spectral imaging module (3) is located between the optical window (1) and the beam splitting module (4). The target gas passes through the optical window (1), is imaged by the spectral imaging module (3), and then irradiates the beam splitting module (4). The beam splitting module (4) is provided with multiple filter units of different wavelengths. The information acquisition and processing module (6) is used to transmit the data acquired from the spectral imaging module (3) to an external computer; The TEC cooling module (7) is positioned in contact with the spectral imaging module (3) to reduce background radiation; The power supply module (5) is used to provide power to the spectral imaging module (3), the spectroscopic module (4), the information acquisition and processing module (6), and the TEC cooling module (7).

2. An infrared gas cloud imager for VOC gas monitoring according to claim 1, characterized in that: The optical window (1) includes a window cover (12) which is fixedly connected to the front end of the housing (2). A protective window (13) is installed inside the window cover (12) through a window pressure ring (14). A window sealing gasket (11) is provided between the window cover (12) and the housing (2). The window sealing gasket (11) is fixedly connected to the window cover (12).

3. An infrared gas cloud imager for VOC gas monitoring according to claim 1, characterized in that: The spectral imaging module (3) includes a fixed base plate (31) which is fixedly connected inside the housing (2). A copper sheet (33) is fixedly connected to the front end of the fixed base plate (31) through a heat insulation column (36). A fixed buckle plate (35) is fixedly connected to the rear end of the fixed base plate (31). An infrared lens (32) is installed on the copper sheet (33). An infrared detector (34) is installed on the fixed buckle plate (35). The infrared lens (32) is located between the infrared detector (34) and the optical window (1).

4. An infrared gas cloud imager for VOC gas monitoring according to claim 3, characterized in that: The beam splitting module (4) includes a filter wheel assembly (41) and a motor assembly (42). The motor assembly (42) is fixedly connected to the top of the fixed base plate (31). The filter wheel assembly (41) is fixedly connected to the rotating shaft of the motor assembly (42). The filter wheel assembly (41) is located between the infrared detector (34) and the infrared lens (32). The motor assembly (42) is used to drive the filter wheel assembly (41) to rotate.

5. An infrared gas cloud imager for VOC gas monitoring according to claim 4, characterized in that: The filter wheel assembly (41) includes a filter wheel (411), and a plurality of mounting holes are equally spaced along the circumference of the filter wheel (411). The filter unit includes a filter (412), and the filter (412) is installed in the mounting hole through a filter retainer (413). The transmission bands of the plurality of filters (412) are all different.

6. An infrared gas cloud imager for VOC gas monitoring according to claim 4, characterized in that: The motor assembly (42) includes a power drive module (422), which includes a support (4223) fixedly connected to the top of the fixed base plate (31). A gearbox (4222) is fixedly connected to the top of the support (4223). A stepper motor (4221) is mounted on the gearbox (4222). A position measurement module (421) and a position indication module (423) are mounted on the stepper motor (4221).

7. An infrared gas cloud imager for VOC gas monitoring according to claim 3, characterized in that: The TEC cooling module (7) includes a heat sink (75) fixedly connected to the bottom of the housing (2). A heat-conducting block (72) is fixedly connected to the top of the heat sink (75) through a heat-conducting block bracket (73). A TEC cooler (71) is fixedly connected to the top of the heat-conducting block bracket (73). A TEC mounting plate (37) is fixedly connected to the fixed base plate (31). The TEC cooler (71) is fixedly connected to the fixed base plate (31) through the TEC mounting plate (37) and is in contact with the infrared lens (32). A bottom sealing gasket (74) is provided between the heat sink (75) and the housing (2). The bottom sealing gasket (74) is fixedly connected to the heat sink (75).

8. An infrared gas cloud imager for VOC gas monitoring according to claim 1, characterized in that: The power module (5) includes a DC-DC module and a filter. The rear end of the housing (2) is provided with a power supply port (9) and a power button (10). The power supply port (9) and the power button (10) are respectively connected to the filter. The filter is used to filter the ripple noise generated by the DC-DC module. The spectral imaging module (3), the spectroscopic module (4) and the information acquisition and processing module (6) are connected to the DC-DC module.

9. An infrared gas cloud imager for VOC gas monitoring according to claim 3, characterized in that: The information acquisition and processing module (6) includes an FPGA module (61), a detector driver module (62), a data cache and storage module (63), a communication and data transmission module (64), and a temperature measurement module. A gigabit network transmission port (8) is provided at the rear end of the housing (2). The beam splitting module (4), the TEC cooling module (7), the detector driver module (62), the data cache and storage module (63), the communication and data transmission module (64), the temperature measurement module, and the gigabit network transmission port (8) are respectively connected to the FPGA module (61). The detector driver module (62) is connected to the infrared detector (34).

10. An infrared gas cloud imager for VOC gas monitoring according to claim 1, characterized in that: The shell (2) is filled with nitrogen gas.

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