A device for monitoring wildfires and a method of using the same

Abstract

The invention discloses a device for monitoring wildfires and a method for using the device. A monitoring mechanism is realized by adopting a housing, a visible light imaging module, a visible light window, an ultraviolet lens, an ultraviolet unit detector, a signal acquisition circuit and a main control circuit. The ultraviolet lens can pass ultraviolet light with a wavelength below 280nm. The ultraviolet unit detector is connected to the signal acquisition circuit. The visible light imaging module, the signal acquisition circuit and a first rotating mechanism are respectively connected to the main control circuit. A first opening and a second opening are opened on the housing. The visible light window is installed at the first opening to close the first opening. The visible light window is directly opposite to the visible light imaging module. The ultraviolet lens is embedded in the second opening. The optical axis of the visible light imaging module is parallel to the optical axis of the ultraviolet lens. The ultraviolet unit detector is located at the focus of the ultraviolet lens. The advantage is that the wildfire can be accurately located and monitored on the basis of relatively low cost.

Description

Technical Field

[0001] The present invention relates to a mountain fire monitoring technology, and in particular to a device for monitoring mountain fires and a method of using the device. Background Art

[0002] The transmission lines used in my country's power grid are located in areas with complex terrain. The unique topography and climatic conditions in these areas are very likely to cause wildfires. The occurrence of wildfires will affect the safety of the transmission lines. If effective preventive measures are not taken to ensure the safe operation of the transmission lines, it will bring great hidden dangers to the safe operation of the power grid. Infrared imagers are often used to monitor wildfires in the prior art. However, in the actual wildfire detection process, cars driving normally on the road, smoke from villagers cooking, and normal production operations in factories may be mistaken for fire heat sources, thereby generating false wildfire alarms, causing serious false alarms and increasing operating costs. In addition, the infrared rays in sunlight are relatively strong, and infrared imagers are also easily interfered by the infrared rays of sunlight and generate false wildfire alarms. In addition, due to the high cost of infrared imagers, it is not easy to promote the use of infrared imagers for wildfire monitoring. Therefore, how to achieve wildfire monitoring at a lower cost and with higher detection accuracy to avoid false alarms has become a problem that needs to be solved urgently.

[0003] In order to solve the problem of false alarms, the Chinese patent No. 201520719704.4 discloses an integrated ultraviolet mountain fire detection machine, including a control host, the control host is electrically connected with a power supply device, a power storage device, a 360-degree pan-tilt, an ultraviolet flame detector, a camera and a wireless communication module, and the ultraviolet flame detector and the camera are installed on the 360-degree pan-tilt and driven to rotate by the 360-degree pan-tilt. The above-mentioned integrated ultraviolet mountain fire detection machine uses an ultraviolet flame detector instead of a traditional infrared imager, solving the defect of high cost of infrared imagers. However, the ultraviolet wildfire detection integrated machine does not clearly explain the ultraviolet band that the ultraviolet flame detector can detect. Once the ultraviolet light detected by the ultraviolet flame detector is interfered by other light in the same band as the ultraviolet light, it will directly lead to low final monitoring accuracy. For example, ultraviolet light in the 280-380nm band is easily interfered by sunlight because the sunlight on the surface is very strong in this band. In addition, the fields of view of the ultraviolet light path constructed by the ultraviolet flame detector and the visible light path constructed by the camera are independent of each other, resulting in the ultraviolet signal in the wildfire obtained by the ultraviolet flame detector and the visible light image obtained by the camera having no correlation, which in turn causes the ultraviolet signal in the wildfire to be separated from the visible light background, making it impossible to accurately locate the location of the wildfire. Summary of the invention

[0004] One of the technical problems to be solved by the present invention is to provide a device for monitoring wildfires which can accurately locate and monitor wildfires at a relatively low cost.

[0005] The technical solution adopted by the present invention to solve one of the above technical problems is: a device for monitoring wildfires, including a pan-tilt, a monitoring mechanism installed on the pan-tilt, and a first rotating mechanism for driving the pan-tilt to achieve 360° circular rotation, the monitoring mechanism including a shell, a visible light imaging module, a visible light window, an ultraviolet lens, an ultraviolet unit detector, a signal acquisition circuit and a main control circuit, the ultraviolet lens can pass ultraviolet light with a wavelength below 280nm, the visible light imaging module, the ultraviolet unit detector, the signal acquisition circuit and the main control circuit are respectively arranged in the shell, the ultraviolet unit detector and The signal acquisition circuit is connected, the visible light imaging module, the signal acquisition circuit and the first rotating mechanism are respectively connected to the main control circuit, the main control circuit communicates with the terminal device in the monitoring room through a wireless network, the shell is provided with a first opening and a second opening, the visible light window is installed at the first opening to close the first opening, the visible light window is opposite to the visible light imaging module, the ultraviolet lens is embedded in the second opening, the optical axis of the visible light imaging module is parallel to the optical axis of the ultraviolet lens, and the ultraviolet unit detector is located at the focus of the ultraviolet lens.

[0006] The first rotating mechanism is realized by a first motor. The visible light imaging module includes a visible light lens, a visible light imaging device, a driving circuit for driving the visible light imaging device to work, and a second motor for zooming or focusing the visible light lens. The visible light lens is connected to the second motor. The main control circuit includes a CPU, an image processing module, a 4G module, a first motor control module and a second motor control module. The CPU is respectively connected to the image processing module, the 4G module, the first motor control module and the second motor control module. The image processing module is respectively connected to the 4G module and the driving circuit. The 4G module communicates with the terminal device through a wireless network, and the terminal device can communicate with the CPU through the 4G module. The CPU is connected to the signal acquisition circuit. The first motor control module is connected to the first motor. The first motor control module is used to drive the first motor to rotate under the control of the CPU so that the pan / tilt rotates synchronously. The second motor control module is connected to the second motor. The second motor control module is used to drive the second motor to rotate under the control of the CPU to zoom or focus the visible light lens.

[0007] The ultraviolet lens described above is a converging lens. Denote the focal length of the ultraviolet lens as f, where 20 mm < f < 400 mm. Denote the field of view angle of the ultraviolet lens as β, and the field of view angle of the visible light lens as γ, where 60° ≥ γ > 5°, 2° < β ≤ 60°, and γ ≥ β. Denote the distance between the optical axis of the visible light lens and the optical axis of the ultraviolet lens as L, where 20 mm < L < 500 mm. In this structure, when the field of view angle of the visible light lens is greater than or equal to that of the ultraviolet lens, it is convenient to judge the relative position of the wildfire in the background target.

[0008] The ultraviolet unit detector described above is any one of GaN (gallium nitride) ultraviolet detectors and SiC (silicon carbide) ultraviolet detectors, and the response band is below 280 nm.

[0009] The power supply mode of the wildfire monitoring device adopts solar power supply or wind power generation or complementary power generation of the two.

[0010] Compared with the prior art, the device of the present invention has the advantage that a monitoring mechanism is formed by a housing, a visible light imaging module, a visible light window, an ultraviolet lens, an ultraviolet unit detector, a signal acquisition circuit and a main control circuit. The ultraviolet lens can pass ultraviolet light with a wavelength below 280nm. The visible light imaging module, the ultraviolet unit detector, the signal acquisition circuit and the main control circuit are respectively arranged in the housing, the ultraviolet unit detector is connected to the signal acquisition circuit, the visible light imaging module, the signal acquisition circuit and the first rotating mechanism are respectively connected to the main control circuit, the main control circuit communicates with the terminal device in the monitoring room through a wireless network, the housing is provided with a first opening and a second opening, and the visible light window is installed in the first opening. The first opening is closed at the mouth, the visible light window is opposite to the visible light imaging module, the ultraviolet lens is embedded in the second opening, the optical axis of the visible light imaging module is parallel to the optical axis of the ultraviolet lens, and the ultraviolet unit detector is located at the focus of the ultraviolet lens. When the staff generates a work instruction at the terminal device and sends it to the main control circuit, the device for monitoring wildfires enters the working state. At this time, the main control circuit controls the first rotating mechanism to rotate once in the same direction at a set time interval, and the rotation angle is α, which is equal to the field of view of the ultraviolet lens. The pan-tilt head rotates synchronously by α under the drive of the first rotating mechanism. The light generated by the target in the monitoring area is respectively irradiated on the visible light imaging module and the ultraviolet lens, and the signal acquisition circuit controls the ultraviolet unit. The output signal of the detector is collected in real time and a sampling signal is generated and sent to the main control circuit. The main control circuit determines in real time whether ultraviolet light exists based on the sampling signal output by the signal collection circuit. When the light generated by the target does not include ultraviolet light, no ultraviolet light passes through the ultraviolet lens, and the ultraviolet unit detector cannot detect ultraviolet light. The main control circuit determines that there is no ultraviolet light at present, and the current working state of the first rotating mechanism remains unchanged. When the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens and converges on the ultraviolet unit detector. The ultraviolet unit detector detects ultraviolet light, and the main control circuit determines that there is ultraviolet light at present. At this time, the main control circuit controls the first rotating mechanism to stop rotating, and the main control circuit The road controls the visible light imaging module to generate clear mountain fire visible light and its background image. The main control circuit obtains the mountain fire visible light and its background image and performs image processing to obtain the processed image and send it to the terminal device to realize mountain fire monitoring. The present invention adopts a monitoring mechanism to replace the traditional expensive infrared imager, which reduces the detection cost and is convenient for promotion at the grassroots level. The optical axis of the visible light imaging module is parallel to the optical axis of the ultraviolet lens, which realizes accurate detection of the target and detects ultraviolet light with a wavelength below 280nm, avoiding the interference of sunlight and fluorescent lamps in this band, and the false alarm rate is low. Therefore, the present invention can accurately locate and monitor mountain fires on the basis of low cost.

[0011] The second technical problem to be solved by the present invention is to provide a method for using a device for monitoring wildfires that can accurately locate and monitor wildfires at a relatively low cost.

[0012] The technical solution adopted by the present invention to solve the second technical problem is: a method for using a device for monitoring wildfires, comprising the following steps:

[0013] (1) A staff member generates a work instruction at the terminal device, and the work instruction is sent to the main control circuit via a wireless network. At this time, the device for monitoring wildfires enters a working state;

[0014] (2) The main control circuit controls the first rotating mechanism to rotate once in the same direction at a set time interval, and the rotation angle is α, where α is equal to the field of view of the ultraviolet lens. The pan / tilt head rotates synchronously by α under the drive of the first rotating mechanism, and the light generated by the target in the monitoring area is respectively irradiated onto the visible light imaging module and the ultraviolet lens. The signal acquisition circuit collects the output signal of the ultraviolet unit detector in real time and generates a sampling signal to be sent to the main control circuit;

[0015] (3) The main control circuit determines in real time whether ultraviolet light exists based on the sampling signal output by the signal acquisition circuit. When the light generated by the target does not include ultraviolet light, no ultraviolet light passes through the ultraviolet lens, and the ultraviolet unit detector cannot detect ultraviolet light. The main control circuit determines that ultraviolet light does not exist at present, and the current working state of the first rotating mechanism remains unchanged. When the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens and converges on the ultraviolet unit detector. The ultraviolet unit detector detects ultraviolet light, and the main control circuit determines that ultraviolet light exists at present. At this time, the main control circuit controls the first rotating mechanism to stop rotating, and the main control circuit controls the visible light imaging module to generate clear mountain fire visible light and its background image. The main control circuit obtains the mountain fire visible light and its background image, performs image processing, and obtains the processed image and sends it to the terminal device to realize mountain fire monitoring.

[0016] The first rotating mechanism is realized by a first motor. The visible light imaging module includes a visible light lens, a visible light imaging device, a driving circuit for driving the visible light imaging device to work, and a second motor for zooming or focusing the visible light lens. The visible light lens is connected to the second motor. The main control circuit includes a CPU, an image processing module, a 4G module, a first motor control module and a second motor control module. The CPU is respectively connected to the image processing module, the 4G module, the first motor control module and the second motor control module. The image processing module is respectively connected to the 4G module and the driving circuit. The 4G module communicates with the terminal device through a wireless network, and the terminal device can communicate with the CPU through the 4G module. The CPU is connected to the signal acquisition circuit. The first motor control module is connected to the first motor. The first motor control module is used to drive the first motor to rotate under the control of the CPU so that the pan / tilt rotates synchronously. The second motor control module is connected to the second motor. The block is used to drive the second motor to rotate under the control of the CPU to zoom or focus the visible light lens; in the step (1), when the work instruction generated by the staff at the terminal device is sent to the CPU through the 4G module, the device for monitoring wildfires enters the working state; in the step (2), the CPU controls the first motor control module to drive the first motor to rotate once in the same direction at a set interval, and the rotation angle is α. The pan / tilt rotates synchronously by α under the drive of the first motor. The light generated by the target in the monitoring area is respectively irradiated onto the visible light lens and the ultraviolet lens. The signal acquisition circuit collects the output signal of the ultraviolet unit detector in real time and generates a sampling signal to send to the CPU; in the step (3), the CPU determines in real time whether ultraviolet light exists based on the sampling signal output by the signal acquisition circuit. When the light generated by the target does not include ultraviolet light, no ultraviolet light is transmitted through the ultraviolet lens, and the ultraviolet unit detector cannot detect ultraviolet light. The CPU determines that ultraviolet light does not exist at present, and the current working state of the first motor control module remains unchanged.When the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens and converges on the ultraviolet unit detector. The ultraviolet unit detector detects the ultraviolet light, and the CPU determines that there is ultraviolet light present at this time. At this time, the CPU controls the first motor to stop rotating through the first motor control module, and controls the second motor to rotate through the second motor control module to zoom or focus the visible light lens. After the visible light lens completes zooming or focusing, the CPU controls the second motor to stop rotating through the second motor control module. The CPU controls the drive module to drive the visible light imaging device to generate visible light and its background image in the wildfire. The image processing module obtains a clear visible light and its background image in the wildfire from the visible light imaging device through the drive module for image processing to obtain a processed image, and sends it to the terminal device through the 4G module to achieve wildfire monitoring.;

[0017] The ultraviolet lens is a converging lens. Denote the focal length of the ultraviolet lens as f, where 20mm < f < 400mm. Denote the field of view angle of the ultraviolet lens as β, and the field of view angle of the visible light lens as γ, where 60° ≥ γ > 5°, 2° < β ≤ 60°, and γ ≥ β. Denote the distance between the optical axis of the visible light lens and the optical axis of the ultraviolet lens as L, where 20mm < L < 500mm.

[0018] The ultraviolet unit detector is any one of a GaN (gallium nitride) ultraviolet detector and a SiC (silicon carbide) ultraviolet detector, and the response band is below 280nm.

[0019] The power supply mode of the wildfire monitoring device adopts solar power supply, wind power generation, or complementary power generation of the two.

[0020] Compared with the prior art, the advantage of the method of use of the present invention is that a monitoring mechanism consisting of a housing, a visible light imaging module, a visible light window, an ultraviolet lens, an ultraviolet unit detector, a signal acquisition circuit and a main control circuit is used to monitor wildfires. The staff generates a work instruction at the terminal device, and the work instruction is sent to the main control circuit through a wireless network. At this time, the device for monitoring wildfires enters a working state. The main control circuit controls the first rotating mechanism to rotate once in the same direction at a set interval, and the rotation angle is α, α is equal to the field of view angle of the ultraviolet lens. The pan-tilt head rotates synchronously by α under the drive of the first rotating mechanism. The light generated by the target in the monitoring area is respectively irradiated on the visible light imaging module and the ultraviolet lens. The signal acquisition circuit collects the output signal of the ultraviolet unit detector in real time and generates a sampling signal to send to the main control circuit. The main control circuit determines in real time whether ultraviolet light exists based on the sampling signal output by the signal acquisition circuit. When the light generated by the target does not include ultraviolet light, no ultraviolet light is transmitted through the ultraviolet lens, and the ultraviolet unit detector cannot detect the ultraviolet light. The main control circuit The main control circuit determines that there is no ultraviolet light at present, and the current working state of the first rotating mechanism remains unchanged; when the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens and converges on the ultraviolet unit detector. The ultraviolet unit detector detects the ultraviolet light, and the main control circuit determines that there is ultraviolet light at present. At this time, the main control circuit controls the first rotating mechanism to stop rotating, and the main control circuit controls the visible light imaging module to generate clear mountain fire visible light and its background image. The main control circuit obtains the mountain fire visible light and its background image and performs image processing to obtain the processed image and sends it to the terminal device to realize mountain fire monitoring. The present invention adopts a monitoring mechanism to replace the traditional expensive infrared imager, reduces the detection cost, and is convenient for promotion at the grassroots level. The optical axis of the visible light imaging module is parallel to the optical axis of the ultraviolet lens, thereby realizing accurate detection of the target, detecting ultraviolet light with a wavelength below 280nm, avoiding the interference of sunlight and fluorescent lamps in this band, and having a low false alarm rate. Therefore, the present invention can accurately locate and monitor mountain fires on the basis of low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural diagram of a device for monitoring mountain fires according to the present invention;

[0022] Figure 2 The figure is a structural block diagram of the main control circuit of the device for monitoring wildfires of the present invention. DETAILED DESCRIPTION

[0023] The present invention discloses a device for monitoring wildfires. The device for monitoring wildfires of the present invention is further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0024] Example: Figure 1 and Figure 2As shown in the figure, a device for monitoring wildfires includes a pan-tilt 1, a monitoring mechanism mounted on the pan-tilt 1, and a first rotating mechanism for driving the pan-tilt 1 to rotate 360° cyclically. The monitoring mechanism includes a housing 2, a visible light imaging module 3, a visible light window 4, an ultraviolet lens 5, an ultraviolet unit detector 6, a signal acquisition circuit 7, and a main control circuit 8. The ultraviolet lens 5 can pass ultraviolet light with a wavelength below 280 nm. The visible light imaging module 3, the ultraviolet unit detector 6, the signal acquisition circuit 7, and the main control circuit 8 are respectively arranged inside the housing. The ultraviolet unit detector 6 is connected to the signal acquisition circuit 7. The visible light imaging module 3, the signal acquisition circuit 7, and the first rotating mechanism are respectively connected to the main control circuit 8. The main control circuit 8 communicates with a terminal device in the monitoring room through a wireless network. The housing 2 is provided with a first opening and a second opening. The visible light window 4 is installed at the first opening to close the first opening. The visible light window 4 faces the visible light imaging module 3. The ultraviolet lens 5 is embedded at the second opening. The optical axes of the visible light imaging module 3 and the ultraviolet lens 5 are parallel. The ultraviolet unit detector 6 is located at the focal point of the ultraviolet lens 5.

[0025] In this embodiment, the first rotating mechanism is implemented by a first motor 9. The visible light imaging module 3 includes a visible light lens, a visible light imaging device, a driving circuit for driving the visible light imaging device to work, and a second motor 10 for zooming or focusing the visible light lens. The visible light lens is connected to the second motor 10. The main control circuit 8 includes a CPU, an image processing module, a 4G module, a first motor control module, and a second motor control module. The CPU is respectively connected to the image processing module, the 4G module, the first motor control module, and the second motor control module. The image processing module is respectively connected to the 4G module and the driving circuit. The 4G module communicates with the terminal device through a wireless network. The terminal device can communicate with the CPU through the 4G module; the CPU is connected to the signal acquisition circuit 7. The first motor control module is connected to the first motor 9. The first motor control module is used to drive the first motor 9 to rotate under the control of the CPU to make the pan-tilt 1 rotate synchronously. The second motor control module is connected to the second motor 10. The second motor control module is used to drive the second motor 10 to rotate under the control of the CPU to zoom or focus the visible light lens.

[0026] In this embodiment, the ultraviolet lens 5 is a converging lens. Denote the focal length of the ultraviolet lens 5 as f, where 20 mm < f < 400 mm. Denote the field of view angle of the ultraviolet lens 5 as β, and the field of view angle of the visible light lens as γ, where 60° ≥ γ > 5°, 2° < β ≤ 60°, and γ ≥ β. Denote the distance between the optical axes of the visible light lens and the ultraviolet lens 5 as L, where 20 mm < L < 500 mm;

[0027] In this embodiment, the ultraviolet unit detector 6 is any one of a GaN ultraviolet detector, a SiC ultraviolet detector, and an ultraviolet photomultiplier tube, and the response band is below 280nm. The CPU, the image processing module, the 4G module, the first motor control module, and the second motor control module are all implemented using mature products in their technical fields, and the CPU is any one of an ARM, a single-chip microcomputer, a DSP, and an FPGA chip.

[0028] In this embodiment, the wildfire monitoring device is powered by solar power or wind power or a combination of the two.

[0029] The present invention further discloses a method for using the device for monitoring wildfires. The method for using the device for monitoring wildfires of the present invention is further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0030] Embodiment: A method for using a device for monitoring wildfires, comprising the following steps:

[0031] (1) The device for monitoring wildfires is set in the wildfire monitoring area, and the staff generates a work instruction at the terminal device, and the work instruction is sent to the main control circuit 8 through the wireless network. At this time, the device for monitoring wildfires enters the working state;

[0032] (2) The main control circuit 8 controls the first rotating mechanism to rotate once in the same direction at a set time interval, and the rotation angle is α, where α is equal to the field of view angle of the ultraviolet lens 5. The pan / tilt 1 rotates synchronously by α under the drive of the first rotating mechanism, and the light generated by the target in the monitoring area is respectively irradiated onto the visible light imaging module 3 and the ultraviolet lens 5. The signal acquisition circuit 7 collects the output signal of the ultraviolet unit detector 6 in real time and generates a sampling signal to be sent to the main control circuit 8;

[0033] (3) The main control circuit 8 determines in real time whether there is ultraviolet light based on the sampling signal output by the signal acquisition circuit 7. When the light generated by the target does not include ultraviolet light, no ultraviolet light passes through the ultraviolet lens 5, and the ultraviolet unit detector 6 cannot detect the ultraviolet light. The main control circuit 8 determines that there is no ultraviolet light at present, and the current working state of the first rotating mechanism remains unchanged; when the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens 5 and converges on the ultraviolet unit detector 6. The ultraviolet unit detector 6 detects the ultraviolet light, and the main control circuit determines that there is ultraviolet light at present. At this time, the main control circuit 8 controls the first rotating mechanism to stop rotating, and the main control circuit 8 controls the visible light imaging module 3 to generate clear mountain fire visible light and its background image. The main control circuit 8 obtains the mountain fire visible light and its background image, performs image processing, and obtains the processed image and sends it to the terminal device to realize mountain fire monitoring.

[0034] In this embodiment, the first rotating mechanism is implemented by a first motor 9, the visible light imaging module 3 includes a visible light lens, a visible light imaging device, a driving circuit for driving the visible light imaging device to work, and a second motor 10 for zooming or focusing the visible light lens, the visible light lens is connected to the second motor 10, the main control circuit 8 includes a CPU, an image processing module, a 4G module, a first motor control module and a second motor control module, the CPU is respectively connected to the image processing module, the 4G module, the first motor control module and the second motor control module, the image processing module is respectively connected to the 4G module and the driving circuit, the 4G module communicates with the terminal device through a wireless network, and the terminal device can communicate with the CPU through the 4G module The CPU is connected to the signal acquisition circuit 7, the first motor control module is connected to the first motor 9, the first motor control module is used to drive the first motor 9 to rotate under the control of the CPU so that the pan-tilt head 1 rotates synchronously, the second motor control module is connected to the second motor 10, the second motor control module is used to drive the second motor 10 to rotate under the control of the CPU to zoom or focus the visible light lens; in step (1), when the work instruction generated by the staff at the terminal device is sent to the CPU through the 4G module, the device for monitoring wildfires enters the working state; in step (2), the CPU controls the first motor control module to drive the first motor 9 to rotate once in the same direction at a set interval, and the rotation angle is α, and the pan-tilt head 1 Driven by the first motor 9, the first motor 9 rotates synchronously by α, and the light generated by the target in the monitoring area is irradiated onto the visible light lens and the ultraviolet lens 5 respectively. The signal acquisition circuit 7 collects the output signal of the ultraviolet unit detector 6 in real time and generates a sampling signal to send to the CPU; in step (3), the CPU determines in real time whether there is ultraviolet light based on the sampling signal output by the signal acquisition circuit 7. When the light generated by the target does not include ultraviolet light, no ultraviolet light passes through the ultraviolet lens 5, and the ultraviolet unit detector 6 cannot detect ultraviolet light. The CPU determines that there is no ultraviolet light at present, and the current working state of the first motor control module remains unchanged. When the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens 5 and converges on the ultraviolet unit detector 6. 6, the ultraviolet unit detector 6 detects ultraviolet light, and the CPU determines that ultraviolet light is currently present. At this time, the CPU controls the first motor 9 to stop rotating through the first motor control module, and controls the second motor 10 to rotate through the second motor control module, and zooms or focuses the visible light lens. When the zoom or focus of the visible light lens is completed, the CPU controls the second motor 10 to stop rotating through the second motor control module, and the CPU controls the driving module to drive the visible light imaging device to generate visible light and its background image in the wildfire. The image processing module obtains clear visible light and its background image in the wildfire from the visible light imaging device through the driving module, performs image processing to obtain a processed image, and sends it to the terminal device through the 4G module to realize wildfire monitoring.

[0035] In this embodiment, the ultraviolet lens 5 is a converging lens. Denote the focal length of the ultraviolet lens 5 as f, where 20 mm < f < 400 mm. Denote the field of view angle of the ultraviolet lens 5 as β, and the field of view angle of the visible light lens as γ, where 60° ≥ γ > 5°, 2° < β ≤ 60°, and γ ≥ β. Denote the distance between the optical axis of the visible light lens and the optical axis of the ultraviolet lens 5 as L, where 20 mm < L < 500 mm.

[0036] In this embodiment, the ultraviolet unit detector 6 is any one of a GaN ultraviolet detector, a SiC ultraviolet detector, and an ultraviolet photomultiplier tube, and the response band is below 280 nm. The CPU, the image processing module, the 4G module, the first motor control module, and the second motor control module are all implemented using mature products in their technical fields. The CPU is any one of an ARM, a single-chip microcomputer, a DSP, and an FPGA chip.

[0037] In this embodiment, the power supply mode of the wildfire monitoring device is solar power supply, wind power generation, or a combination of the two for complementary power generation.

Claims

1. A device for monitoring wildfires, comprising a pan-tilt platform, a monitoring mechanism mounted on the pan-tilt platform, and a first rotating mechanism for driving the pan-tilt platform to achieve 360° circular rotation, characterized in that The described monitoring mechanism includes a housing, a visible light imaging module, a visible light window, an ultraviolet lens, an ultraviolet unit detector, a signal acquisition circuit, and a main control circuit. The ultraviolet lens can transmit ultraviolet light with a wavelength below 280 nm. The visible light imaging module, the ultraviolet unit detector, the signal acquisition circuit, and the main control circuit are respectively arranged inside the housing. The ultraviolet unit detector is connected to the signal acquisition circuit. The visible light imaging module, the signal acquisition circuit, and the first rotation mechanism are respectively connected to the main control circuit. The main control circuit communicates with a terminal device in the monitoring room through a wireless network. The housing is provided with a first opening and a second opening. The visible light window is installed at the first opening to close the first opening. The visible light window faces the visible light imaging module. The ultraviolet lens is embedded at the second opening. The optical axis of the visible light imaging module is parallel to the optical axis of the ultraviolet lens. The ultraviolet unit detector is located at the focal point of the ultraviolet lens; The first rotation mechanism is implemented by a first motor. The visible light imaging module includes a visible light lens, a visible light imaging device, a driving circuit for driving the visible light imaging device to work, and a second motor for zooming or focusing the visible light lens. The visible light lens is connected to the second motor. The main control circuit includes a CPU, an image processing module, a 4G module, a first motor control module, and a second motor control module. The CPU is respectively connected to the image processing module, the 4G module, the first motor control module, and the second motor control module. The image processing module is respectively connected to the 4G module and the driving circuit. The 4G module communicates with the terminal device through a wireless network. The terminal device can communicate with the CPU through the 4G module; the CPU is connected to the signal acquisition circuit. The first motor control module is connected to the first motor. The first motor control module is used to drive the first motor to rotate under the control of the CPU to make the pan-tilt rotate synchronously. The second motor control module is connected to the second motor. The second motor control module is used to drive the second motor to rotate under the control of the CPU to zoom or focus the visible light lens; The ultraviolet lens is a converging lens. Denote the focal length of the ultraviolet lens as f, where 20 mm < f < 400 mm. Denote the field of view angle of the ultraviolet lens as β. Denote the field of view angle of the visible light lens as γ, where 60° ≥ γ > 5°, 2° < β ≤ 60°, and γ ≥ β. Denote the distance between the optical axis of the visible light lens and the optical axis of the ultraviolet lens as L, where 20 mm < L < 500 mm.

2. A device for monitoring wildfires according to claim 1, characterized in that The ultraviolet unit detector is any one of a GaN (gallium nitride) ultraviolet detector and a SiC (silicon carbide) ultraviolet detector, and the response band is below 280nm.

3. A device for monitoring wildfires according to claim 1, characterized in that The power supply mode of the mountain fire monitoring device adopts solar power supply or wind power generation or the complementary power generation of the two.

4. A method for using the device for monitoring wildfires according to claim 1, characterized in that The following steps are involved: (1) A staff member generates a work instruction at the terminal device, and the work instruction is sent to the main control circuit via a wireless network. At this time, the device for monitoring wildfires enters a working state; (2) The main control circuit controls the first rotating mechanism to rotate once in the same direction at a set time interval, and the rotation angle is α, where α is equal to the field of view of the ultraviolet lens. The pan / tilt head rotates synchronously by α under the drive of the first rotating mechanism, and the light generated by the target in the monitoring area is respectively irradiated onto the visible light imaging module and the ultraviolet lens. The signal acquisition circuit collects the output signal of the ultraviolet unit detector in real time and generates a sampling signal to be sent to the main control circuit; (3) The main control circuit determines in real time whether ultraviolet light exists based on the sampling signal output by the signal acquisition circuit. When the light generated by the target does not include ultraviolet light, no ultraviolet light passes through the ultraviolet lens, and the ultraviolet unit detector cannot detect ultraviolet light. The main control circuit determines that ultraviolet light does not exist at present, and the current working state of the first rotating mechanism remains unchanged. When the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens and converges on the ultraviolet unit detector. The ultraviolet unit detector detects ultraviolet light, and the main control circuit determines that ultraviolet light exists at present. At this time, the main control circuit controls the first rotating mechanism to stop rotating, and the main control circuit controls the visible light imaging module to generate clear images of visible light of wildfire and its background. The main control circuit obtains the visible light of wildfire and its background image, performs image processing, and obtains the processed image and sends it to the terminal device to realize wildfire monitoring. The first rotating mechanism is realized by a first motor. The visible light imaging module includes a visible light lens, a visible light imaging device, a driving circuit for driving the visible light imaging device to work, and a second motor for zooming or focusing the visible light lens. The visible light lens is connected to the second motor. The main control circuit includes a CPU, an image processing module, a 4G module, a first motor control module and a second motor control module. The CPU is respectively connected to the image processing module, the 4G module, the first motor control module and the second motor control module. The image processing module is respectively connected to the 4G module and the driving circuit. The 4G module communicates with the terminal device through a wireless network, and the terminal device can communicate with the CPU through the 4G module. The CPU is connected to the signal acquisition circuit. The first motor control module is connected to the first motor. The first motor control module is used to drive the first motor to rotate under the control of the CPU so that the pan / tilt rotates synchronously. The second motor control module is connected to the second motor. The second motor control module is used to drive the second motor to rotate under the control of the CPU to zoom or focus the visible light lens. In step (1), when the work instruction generated by the staff at the terminal device is sent to the CPU through the 4G module, the device for monitoring wildfires enters the working state. In step (2), the CPU controls the first motor control module to drive the first motor to rotate in the same direction once every set time, and the rotation angle is α. The pan-tilt rotates synchronously by α under the drive of the first motor. The light generated by the target in the monitoring area irradiates the visible light lens and the ultraviolet lens respectively. The signal acquisition circuit collects the output signal of the ultraviolet unit detector in real time and generates a sampling signal and sends it to the CPU. In step (3), the CPU determines in real time whether there is ultraviolet light based on the sampling signal output by the signal acquisition circuit. When the light generated by the target does not include ultraviolet light, no ultraviolet light passes through the ultraviolet lens, and the ultraviolet unit detector cannot detect ultraviolet light. The CPU determines that there is no ultraviolet light currently, and the current working state of the first motor control module remains unchanged. When the light generated by the target includes ultraviolet light, the ultraviolet light passes through the ultraviolet lens and converges on the ultraviolet unit detector. The ultraviolet unit detector detects ultraviolet light. The CPU determines that there is ultraviolet light currently. At this time, the CPU controls the first motor to stop rotating through the first motor control module, and controls the second motor to rotate through the second motor control module to zoom or focus the visible light lens. When the zooming or focusing of the visible light lens is completed, the CPU controls the second motor to stop rotating through the second motor control module. The CPU controls the drive module to drive the visible light imaging device to generate the visible light and its background image in the wildfire. The image processing module obtains the clear visible light and its background image in the wildfire from the visible light imaging device through the drive module for image processing to obtain a processed image, and sends it to the terminal device through the 4G module to achieve wildfire monitoring. The ultraviolet lens is a converging lens. Denote the focal length of the ultraviolet lens as f, where 20 mm < f < 400 mm. Denote the field of view angle of the ultraviolet lens as β, and the field of view angle of the visible light lens as γ, where 60° ≥ γ > 5°, 2° < β ≤ 60°, and γ ≥ β. Denote the distance between the optical axis of the visible light lens and the optical axis of the ultraviolet lens as L, where 20 mm < L < 500 mm.

5. The method for using the device for monitoring wildfires according to claim 4, characterized in that The ultraviolet unit detector is any one of GaN (gallium nitride) ultraviolet detectors and SiC (silicon carbide) ultraviolet detectors, and the response band is below 280 nm.

6. The method for using the device for monitoring wildfires according to claim 4, characterized in that The power supply mode of the wildfire monitoring device adopts solar power supply or wind power generation or a combination of both for complementary power generation.

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