Portable Ground-based Lidar Wind Profiler

Abstract

The present invention provides a portable ground-based lidar wind profiler. It includes a frame. On the front and rear sides of the frame, there are respectively a first installation chamber and a second installation chamber for installing electronic components. At the upper end of the frame, there is an upper cover with a radar scanning port. Maintenance covers are provided on both the first installation chamber and the second installation chamber. In the middle of the frame, there is a heat dissipation air duct. Heat dissipation slots are provided on both sides of the heat dissipation air duct. At the lower end of the heat dissipation air duct, there is a heat dissipation fan. A radar lens module is arranged in the heat dissipation air duct. Ventilation gaps are provided on the front and rear sides at the upper end of the frame. The ventilation gaps cooperate with the upper cover to form a ventilation slot. When conducting detection work, the heat dissipation fan ventilates the heat dissipation air duct, and blows the hot air out from the ventilation slot. The present invention relates to the field of lidar wind profilers.

Description

Technical Field

[0001] The present invention relates to the field of lidar for wind measurement, and particularly to a portable ground-based lidar for wind measurement. Background Art

[0002] As a core device for monitoring the atmospheric wind field, ground-based lidar for wind measurement realizes three-dimensional wind field inversion through the backscattering effect of laser pulses and atmospheric particles, and has now been widely used in meteorological monitoring, environmental assessment, and wind power generation fields. The high-power laser and precision electronic components of this device generate significant thermal loads during continuous operation, which poses strict requirements for system thermal management. More critically, the electromagnetic radiation generated by its internal high-frequency circuits is likely to cause co-frequency interference to sensitive frequency bands such as satellite communication and aviation navigation, and may cause major safety hazards in military facilities, airport air traffic control, and areas with dense electronics. Therefore, it must meet the military electromagnetic compatibility standard GJB151B-2013.

[0003] Currently, mainstream lidar products for wind measurement generally adopt an integrated cavity design, integrating the signal processing module and the laser transmitting telescope in the same enclosed space. Although such a structure meets the basic IP67 protection requirements, it has two technical defects: Firstly, the laser emission window becomes the main channel for electromagnetic leakage, and the electromagnetic far exceeds the standard limit of item RS105 in GJB151B; Secondly, the centralized heat dissipation system results in an easy cross of the heat flow path. When encountering extreme environments, such as a high-temperature weather with a ground ambient temperature of 60°C, the temperature rise of key components is too large, affecting the signal inversion accuracy.

[0004] Therefore, it is very necessary to develop a portable ground-based lidar for wind measurement with good heat dissipation, low electromagnetic radiation, and the ability to adapt to relatively harsh environments. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention proposes a portable ground-based lidar for wind measurement, aiming to solve the heat dissipation problem and the problem of electromagnetic signal radiation interference of traditional lidar for wind measurement.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: a portable ground-based lidar, which includes a frame. On the front and rear sides of the frame, there are respectively a first installation chamber and a second installation chamber for installing electronic components. At the upper end of the frame, there is an upper cover with a radar scanning port. Maintenance covers are provided on both the first installation chamber and the second installation chamber. In the middle of the frame, there is a heat dissipation air duct. On both sides of the heat dissipation air duct, there are heat dissipation slots. At the lower end of the heat dissipation air duct, there is a heat dissipation fan. A radar lens module is arranged in the heat dissipation air duct. Ventilation gaps are provided on the front and rear sides at the upper end of the frame. The ventilation gaps cooperate with the upper cover to form a ventilation slot. When performing detection work, the heat dissipation fan ventilates the heat dissipation air duct, and the hot air is blown out from the ventilation slot.

[0007] Based on the above, when the electronic components are operating, they will generate relatively strong radiation signals, thus interfering with the surrounding electronic devices. The present invention is provided with a first installation chamber and a second installation chamber for installing electronic components, which isolate the electromagnetic radiation signals and prevent the electromagnetic radiation signals from being emitted through the radar scanning port, greatly reducing the impact of the electromagnetic radiation signals on the surrounding environment. When a fault occurs, only by opening the maintenance cover can the parts in the first installation chamber or the second installation chamber be detected and repaired. In addition, the radar lens module is arranged on the heat dissipation air duct. When performing detection work, the heat dissipation fan ventilates the heat dissipation air duct, and the hot air is blown out from the ventilation slot. Through the heat dissipation air duct, the electronic components in the first installation chamber and the second installation chamber and the radar lens module in the heat dissipation air duct can be cooled simultaneously, greatly improving the heat dissipation effect.

[0008] Further, a filter window piece is arranged on the radar scanning port. On one side of the filter window piece, there is a wiper. One end of the wiper is provided with a wiper motor. The wiper motor is arranged inside the upper cover. A drainage groove is arranged around the periphery of the filter window piece. The drainage groove is communicated with a drainage pipe. The drainage pipe passes through the heat dissipation air duct and leads directly to the lower end of the frame.

[0009] Based on the above, in rainy weather or when the filter window piece needs to be cleaned, the wiper can sweep away the water quality or foreign objects on the filter window piece, and the liquid swept will flow into the drainage pipe through the drainage groove and be discharged. This enables the present invention to perform detection work even in rainy weather.

[0010] Further, the radar lens module includes a telescope module and a wedge mirror module disposed above the telescope module. The wedge mirror module includes a wedge mirror and a wedge mirror driving device. The wedge mirror driving device includes a synchronous pulley coaxially engaged with the wedge mirror. The synchronous pulley is connected to the output shaft of the stepping motor through a synchronous belt. Both the telescope module and the wedge mirror module are provided with metal casings for encapsulation.

[0011] Based on the above, the stepping motor drives the synchronous pulley to rotate through the synchronous belt, and the wedge mirror rotates under the drive of the synchronous pulley. The transmission between the synchronous belt and the synchronous pulley makes the rotation angle of the wedge mirror more accurate. Both the telescope module and the wedge mirror module are provided with metal casings for independent encapsulation, which can protect the radar lens module and, at the same time, largely isolate external interference.

[0012] Further, the frame includes a first frame plate and a second frame plate. Both the first frame plate and the second frame plate are provided with threaded mounting holes and wire passing holes. The first frame plate and the second frame plate are fixedly fitted through screws with the threaded mounting holes. The wire passing holes are used for the connection of lines between the first installation chamber and the second installation chamber.

[0013] Based on the above, the frame is composed of the first frame plate and the second frame plate, making disassembly, installation, and maintenance more convenient. The first installation chamber and the second installation chamber are electrically connected through the wire passing holes, enabling the electronic components in the first installation chamber and the second installation chamber to be electrically connected.

[0014] Further, a data acquisition card, a control board, and an industrial computer are arranged in the first installation chamber. A serial port server is arranged on the data acquisition card, and a power supply board is arranged at the lower end of the control board. A polarization-maintaining fiber acousto-optic modulator, a communication module, a seed source, an optical module, and a balanced detector are arranged in the second installation chamber.

[0015] Further, a protective cover is arranged below the cooling fan, and the ventilation holes of the protective cover are arranged on the side surface of the protective cover.

[0016] Based on the above, the ventilation holes are arranged on the side surface of the protective cover, allowing air to enter the heat dissipation air duct from all around the protective cover and preventing the cooling fan from directly sucking dust on the ground.

[0017] Further, a conductive sealing ring is arranged at the mating part of the maintenance cover and the frame, and support angle seats are arranged below the maintenance cover.

[0018] Based on the above, arranging a conductive sealing ring at the mating part of the maintenance cover and the frame enhances the overall sealing performance of the present invention.

[0019] Further, one side of the first frame plate is provided with an antenna, a power interface and a network cable interface.

[0020] Based on the above, the antenna is used for receiving and transmitting signals, and the power interface and the network cable interface are used for connecting to external devices.

[0021] Further, the output rotating shaft of the wiper motor is fixedly matched with the wiper, a stroke groove is arranged on the wiper motor, and a stroke limit post matched with the stroke groove is arranged on the wiper.

[0022] Based on the above, the wiper motor drives the wiper to swing on the filter window sheet, so as to achieve a cleaning effect. The cooperation between the stroke groove and the stroke limit post can limit the swing amplitude of the wiper.

[0023] Further, a spirit level is also arranged on the upper cover.

[0024] Based on the above, when detecting the atmospheric wind field, the placement state of the present invention can be adjusted through the spirit level, and the detection accuracy can be improved.

[0025] In order to more clearly elaborate the above features of the present invention and the purposes to be achieved, the following further describes the present invention in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 : is a right view of the overall structure of the present invention in an exploded state;

[0028] Figure 3 : is a structural schematic diagram of the first installation chamber of the present invention;

[0029] Figure 4 : is a structural schematic diagram of the second installation chamber of the present invention;

[0030] Figure 5 : is a structural schematic diagram of the frame of the present invention;

[0031] Figure 6 : is a left view of the present invention;

[0032] Figure 7 : is Figure 6 a sectional structural schematic diagram of the A-A cutting line in

[0033] Figure 8 : is a right view of the radar lens module of the present invention;

[0034] Figure 9 : is Figure 8 the schematic cross-sectional structure diagram of the B-B cutting line in

[0035] Figure 10 : the schematic structural diagram of the wedge mirror driving device of the present invention;

[0036] Figure 11 : the schematic structural diagram of the wiper and the wiper motor of the present invention;

[0037] Figure 12 : is Figure 11 the enlarged schematic structural diagram of part A in

[0038] Figure 13 : the schematic diagram of the internal wind flow field of the present invention.

[0039] Explanation of the reference numerals in the drawings: 1 frame; 2 first installation chamber; 3 second installation chamber; 4 radar scanning port; 5 upper cover; 6 maintenance cover; 7 heat dissipation air duct; 8 heat dissipation slot; 9 heat dissipation fan; 10 radar lens module; 11 ventilation notch; 13 filter window piece; 14 wiper; 15 wiper motor; 16 drain trough; 17 drain pipe; 18 telescope module; 19 wedge mirror module; 20 wedge mirror; 21 synchronous pulley; 22 synchronous belt; 23 stepper motor; 24 metal shell; 25 first frame plate; 26 second frame plate; 27 threaded mounting hole; 28 wire passing hole; 29 serial server; 30 control board; 31 industrial control computer; 32 polarization-maintaining fiber acousto-optic modulator; 33 communication module; 34 seed source; 35 optical module; 36 protective cover; 37 ventilation hole; 38 conductive sealing ring; 39 support angle seat; 40 antenna; 41 power interface; 42 network cable interface; 43 travel slot; 44 travel limit post; 45 level gauge; 46 data acquisition card; 47 power board; 48 balance detector. Detailed implementation manners

[0040] As Figures 1 to 13 shown, a portable ground-based lidar includes a frame 1. The front and rear sides of the frame 1 are respectively provided with a first installation chamber 2 and a second installation chamber 3 for installing electronic components. The upper end of the frame 1 is provided with an upper cover 5 with a radar scanning port 4. The first installation chamber 2 and the second installation chamber 3 are both provided with maintenance covers 6. The frame 1 and the maintenance covers 6 are all made of all-metal materials, which can effectively isolate electromagnetic radiation. The middle part of the frame 1 is provided with a through heat dissipation air duct 7. The two sides of the heat dissipation air duct 7 are provided with heat dissipation slots 8. The lower end of the heat dissipation air duct 7 is provided with a heat dissipation fan 9. A radar lens module 10 is arranged in the heat dissipation air duct 7. The front and rear sides of the upper end of the frame 1 are provided with ventilation notches 11. A handle is arranged below the ventilation notches 11. The ventilation notches 11 and the lower surface of the upper cover 5 cooperate to form a ventilation slot.

[0041] When the electronic component is operating, it will generate relatively strong radiation signals, which will interfere with the surrounding electronic devices. The present invention is provided with a first installation chamber 2 and a second installation chamber 3 for installing the electronic component, isolating the electromagnetic radiation signal and preventing the electromagnetic radiation signal from being emitted through the radar scanning port 4, greatly reducing the impact of the electromagnetic radiation signal on the surrounding environment. When a failure occurs, the parts in the first installation chamber 2 or the second installation chamber 3 can be detected and repaired as long as the maintenance cover 6 is opened.

[0042] In addition, the radar lens module 10 is arranged on the heat dissipation air duct 7. When the detection work is carried out, the heat dissipation fan 9 ventilates the heat dissipation air duct 7, and the hot air blows out from the ventilation slot. Through the heat dissipation air duct 7, the electronic components in the first installation chamber 2 and the second installation chamber 3 and the radar lens module 10 of the heat dissipation air duct 7 can be cooled at the same time. It is known from the experimental data that even when the ambient temperature reaches 60 °C, the CPU temperature rise of the highest heat source industrial control motherboard of the present invention is 17 degrees Celsius, that is, 77 °C, while the CPU of a general industrial-grade industrial control computer can operate normally at about 85 degrees Celsius, greatly improving the heat dissipation effect and at the same time being able to adapt to a more severe detection environment. As Figure 13 shown, it is a schematic diagram of the air flow field when the heat dissipation fan 9 is working. The present invention seals the radar lens module 10 and the electrical components separately, not only realizing heat source separation (temperature difference control ≤ 5 °C) and directional heat dissipation (heat flow efficiency increased by 40%), but also attenuating the electromagnetic leakage to less than 28 dBμV / m through the waveguide cutoff filtering technology. While ensuring the IP67 protection level, the device passes all electromagnetic compatibility test items of GJB151B-2013.

[0043] Preferably, a filter window piece 13 is arranged on the radar scanning port 4, and the filter window piece 13 can protect the wedge mirror 20. A wiper 14 is arranged on one side of the filter window piece 13, and a wiper motor 15 is arranged at one end of the wiper 14. The wiper motor 15 is arranged inside the upper cover 5. A drain groove 16 is arranged around the periphery of the filter window piece 13, and the drain groove 16 is communicated with a drain pipe 17. The drain pipe 17 passes through the heat dissipation air duct 7 and leads directly to the lower end of the frame 1. In rainy weather or when the filter window piece 13 needs to be cleaned, the wiper 14 can sweep away the water quality or foreign matters on the filter window piece 13, and the liquid swept away will flow into the drain pipe 17 through the drain groove 16 and be discharged. So that the present invention can also carry out detection work in rainy weather.

[0044] Preferably, the radar lens module 10 includes a telescope module 18 and a wedge prism module 19 disposed above the telescope module 18. The wedge prism module 19 includes a wedge prism 20 and a wedge prism driving device. The wedge prism driving device includes a synchronous pulley 21 coaxially engaged with the wedge prism 20. A bearing is coaxially engaged with the lower end of the synchronous pulley 21. The synchronous pulley 21 is connected to the output shaft of a stepping motor 23 through a synchronous belt 22. A placement groove for placing the stepping motor 23 is provided on the frame 1. The telescope module 18 and the wedge prism module 19 are both encapsulated with a metal shell 24. During detection work, the stepping motor 23 drives the synchronous pulley 21 to rotate through the synchronous belt 22, and the wedge prism 20 rotates under the drive of the synchronous pulley 21. The synchronous belt 22 is used to drive the synchronous pulley 21 for transmission, making the rotation angle of the wedge prism 20 more accurate, thereby improving the detection effect. The telescope module 18 and the wedge prism module 19 are both encapsulated with a metal shell 24 independently. When the cooling fan 9 ventilates the cooling air duct 7, it avoids moisture and dust in the air from contaminating the telescope module 18 and the wedge prism module 19, thus playing a protective role.

[0045] Preferably, the frame 1 includes a first frame plate 25 and a second frame plate 26. Threaded mounting holes 27 and wire passing holes 28 are provided on both the first frame plate 25 and the second frame plate 26. The first frame plate 25 and the second frame plate 26 are fixedly fitted through screws cooperating with the threaded mounting holes 27. The wire passing holes 28 are used for the line connection between the first installation chamber 2 and the second installation chamber 3. During fitting and installation, sealing rings are provided at the outer edges of the threaded mounting holes 27 and the wire passing holes 28, thereby improving the overall sealing performance of the device and preventing water flow from entering the first installation chamber 2 or the second installation chamber 3. The frame 1 is composed of the first frame plate 25 and the second frame plate 26, making disassembly, assembly, and maintenance more convenient. The first installation chamber 2 and the second installation chamber 3 are electrically connected through the wire passing holes 28, enabling the electronic components in the first installation chamber 2 and the second installation chamber 3 to achieve electrical connection.

[0046] Preferably, a data acquisition card 46, a control board 30, and an industrial computer 31 are provided in the first installation chamber 2. A serial port server 29 is provided on the data acquisition card 46. A power supply board 47 is provided at the lower end of the control board 30. A polarization-maintaining fiber acousto-optic modulator 32, a communication module 33, a seed source 34, an optical module 35, and a balanced detector 48 are provided in the second installation chamber 3.

[0047] Preferably, a protective cover 36 is provided below the cooling fan 9, and the ventilation holes 37 of the protective cover 36 are arranged on the side surface of the protective cover 36. The ventilation holes 37 are arranged on the side surface of the protective cover 36, so that the wind enters the cooling air duct 7 from the periphery of the protective cover 36, preventing the cooling fan 9 from directly adsorbing the dust on the ground.

[0048] Preferably, a conductive sealing ring 38 is provided at the mating part of the maintenance cover 6 and the frame 1, and a support angle seat 39 is provided below the maintenance cover 6. When performing atmospheric wind field detection, sudden weather changes need to be faced, such as rainy days. The conductive sealing ring 38 provided at the mating part of the maintenance cover 6 and the frame 1 can enhance the overall sealing performance of the present invention and prevent liquid from entering the machine body.

[0049] Preferably, an antenna 40, a power supply interface 41 and a network cable interface 42 are provided on one side of the first frame plate 25. The antenna 40 is used for receiving and transmitting signals, and the power supply interface 41 and the network cable interface 42 are used for connecting with external devices.

[0050] Preferably, the output rotating shaft of the wiper motor 15 is fixedly matched with the wiper 14, a travel groove 43 is provided on the wiper motor 15, and a travel limit post 44 matched with the travel groove 43 is provided on the wiper 14. The wiper motor 15 drives the wiper 14 to swing on the filter window sheet 13, so as to achieve the cleaning effect. The cooperation of the travel groove 43 and the travel limit post 44 can limit the swing amplitude of the wiper 14.

[0051] Preferably, a spirit level 45 is further provided on the upper cover 5. When detecting the atmospheric wind field, the placement state of the present invention can be adjusted through the spirit level 45, improving the detection accuracy.

[0052] The above are only the optimal solution embodiments of the present invention and are not used to limit the present invention. Various modifications or substitutions made by those skilled in the art without departing from the essence and protection scope of the present invention should also be within the protection scope of the present invention.

Claims

1. A portable ground-based lidar for wind measurement, comprising a frame (1), characterized in that: On the front and back sides of the frame (1), a first installation chamber (2) and a second installation chamber (3) for installing electronic components are respectively arranged. On the upper end of the frame (1), an upper cover (5) with a radar scanning port (4) is provided. Maintenance covers (6) are arranged on both the first installation chamber (2) and the second installation chamber (3). A heat dissipation air duct (7) is arranged in the middle of the frame (1). Heat dissipation slots (8) are arranged on both sides of the heat dissipation air duct (7). A heat dissipation fan (9) is arranged at the lower end of the heat dissipation air duct (7). A radar lens module (10) is arranged in the heat dissipation air duct (7). Ventilation notches (11) are arranged on the front and back sides at the upper end of the frame (1). The ventilation notches (11) and the upper cover (5) cooperate to form a ventilation slot. When conducting detection work, the heat dissipation fan (9) ventilates the heat dissipation air duct (7), and blows the hot air out from the ventilation slot; The frame (1) includes a first frame plate (25) and a second frame plate (26). Threaded mounting holes (27) and wire passing holes (28) are arranged on both the first frame plate (25) and the second frame plate (26). The first frame plate (25) and the second frame plate (26) are fixedly fitted by screws with the threaded mounting holes (27). The wire passing holes (28) are used for the line connection between the first installation chamber (2) and the second installation chamber (3).

2. The portable ground-based lidar for wind measurement according to claim 1, characterized in that: A filter window sheet (13) is arranged on the radar scanning port (4). A wiper (14) is arranged on one side of the filter window sheet (13). A wiper motor (15) is arranged at one end of the wiper (14). The wiper motor (15) is arranged inside the upper cover (5). A drainage groove (16) is arranged around the periphery of the filter window sheet (13). A drain pipe (17) is communicated with the drainage groove (16). The drain pipe (17) passes through the heat dissipation air duct (7) and leads directly to the lower end of the frame (1).

3. The portable ground-based lidar for wind measurement according to claim 1, wherein: The radar lens module (10) includes a telescope module (18) and a wedge mirror module (19) arranged above the telescope module (18). The wedge mirror module (19) includes a wedge mirror (20) and a wedge mirror driving device. The wedge mirror driving device includes a synchronous pulley (21) coaxially fitted with the wedge mirror (20). The synchronous pulley (21) is connected to the output shaft of a stepping motor (23) through a synchronous belt (22). Both the telescope module (18) and the wedge mirror module (19) are encapsulated with a metal shell (24).

4. The portable ground-based lidar for wind measurement according to claim 1, characterized in that: A data acquisition card (46), a control board (30) and an industrial computer (31) are arranged in the first installation chamber (2). A serial port server (29) is arranged on the data acquisition card (46). A power supply board (47) is arranged at the lower end of the control board (30). A polarization-maintaining fiber acousto-optic modulator (32), a communication module (33), a seed source (34), an optical module (35) and a balanced detector (48) are arranged in the second installation chamber (3).

5. The portable ground-based lidar for wind measurement according to claim 1, wherein: A protective cover (36) is provided below the cooling fan (9), and the ventilation holes (37) of the protective cover (36) are arranged on the side surface of the protective cover (36).

6. The portable ground-based lidar for wind measurement according to claim 1, wherein: A conductive sealing ring (38) is provided at the mating part of the maintenance cover (6) and the frame (1), and a support angle seat (39) is provided below the maintenance cover (6).

7. The portable ground-based lidar for wind measurement according to claim 1, wherein: An antenna (40), a power supply interface (41) and a network cable interface (42) are arranged on one side of the first frame plate (25).

8. The portable ground-based lidar for wind measurement according to claim 2, wherein: The output rotating shaft of the wiper motor (15) is fixedly matched with the wiper (14). A travel groove (43) is provided on the wiper motor (15), and a travel limit post (44) matched with the travel groove (43) is provided on the wiper (14).

9. The portable ground-based lidar for wind measurement according to claim 1, wherein: A level gauge (45) is further provided on the upper cover (5).

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