Large aperture transmission type ultra-short laser radar antenna

Abstract

The application relates to a large-aperture transmission type ultra-short laser radar antenna, and belongs to the technical field of laser radar antennas.The application comprises a shell, a fixing plate is arranged on the shell, the fixing plate is used for being connected with a holder, one end of the shell is located in the holder, a mirror group is arranged in the shell, and an optical fiber is arranged at the end of the shell far from the holder.The application has the effects of solving the problem of gravity center deviation and reducing the difficulty of holder debugging and leveling.

Description

Technical Field

[0001] This application relates to the field of lidar antenna technology, and in particular to a large-aperture transmission-type ultrashort lidar antenna. Background Technology

[0002] As an advanced remote sensing technology, lidar has been widely used in meteorological observation in recent years. Lidar wind measurement technology, with its high precision, high spatiotemporal resolution, and all-weather operation capability, has become one of the important means of measuring atmospheric wind speed and direction.

[0003] Larger aperture lidar antennas have played an important role in technological development. However, existing large aperture lidar antennas have multiple lenses concentrated at the front end, causing the center of gravity of the lidar antenna to be biased towards the front. When the lidar antenna is working, the center of gravity shifts, which increases the difficulty of gimbal adjustment and balancing. Moreover, the structure of the lidar antenna cannot flexibly adapt to the position of the center of gravity, resulting in a lack of stability during antenna operation and affecting the accuracy of detection. Utility Model Content

[0004] To address the issue of center of gravity shift and reduce the difficulty of gimbal adjustment and balancing, this application provides a large-aperture transmission-type ultrashort lidar antenna.

[0005] This application provides a large-aperture transmission-type ultrashort lidar antenna. The technical solution adopted is as follows: A large-aperture transmission-type ultrashort lidar antenna includes a housing, a fixing plate on the housing for connecting to a gimbal, such that one end of the housing is located inside the gimbal, a mirror assembly is disposed inside the housing, and an optical fiber is disposed at the end of the housing away from the gimbal.

[0006] By adopting the above technical solution, the fixing plate is set on the housing, and the fixing plate forms a stable connection with the gimbal. This allows part of the housing and part of the mirror assembly inside the housing to be installed inside the gimbal. One end of the housing extends into the gimbal, making the overall center of gravity closer to the rotation axis of the gimbal. The weight of the part of the housing located outside the gimbal is reduced, preventing the entire housing and mirror assembly from being located outside the gimbal. This prevents the center of gravity from shifting due to the concentrated weight at the end when the lidar antenna is working. By setting part of the housing and part of the mirror assembly inside the gimbal, the center of gravity position of the lidar is readjusted, which significantly reduces the difficulty of gimbal debugging and balancing, ensures the stability of the antenna during operation, and improves the detection accuracy of the lidar antenna.

[0007] Optionally, the housing includes a front lens barrel, and a stepped platform is provided at one end of the front lens barrel near the fixing plate. The fixing plate is located on the stepped platform and is fixedly connected to the stepped platform.

[0008] By adopting the above technical solution, the fixing plate is set on the stepped platform. One side of the stepped platform provides a circumferential platform support structure for the fixing plate, and the other side of the stepped platform provides a fixing contact surface for the fixing plate. This helps to increase the contact area between the fixing plate and the front lens barrel, ensuring that the fixing plate is stably connected to the front lens barrel, improving the stability of the connection between the two, and preventing the fixing plate from shaking due to external forces such as vibration when the lidar antenna is working, thus avoiding affecting the detection accuracy of the lidar antenna.

[0009] Optionally, a first limiting protrusion is fixedly provided on the stepped platform, the housing includes a middle lens barrel, and a second limiting protrusion is fixedly provided at one end of the middle lens barrel near the fixed plate, the second limiting protrusion abutting against the stepped platform.

[0010] By adopting the above technical solution, the second limiting protrusion abuts against one end of the stepped platform, the stepped platform restricts excessive advancement during the installation of the middle lens barrel, the first limiting protrusion further limits the middle lens barrel, effectively preventing the middle lens barrel from colliding with the lens during installation, avoiding the collision that causes the lens position to move, and preventing the middle lens barrel from colliding with the lens and causing scratches. At the same time, the second limiting protrusion abuts against the stepped platform, ensuring that the stepped platform provides stable support for the fixing plate.

[0011] Optionally, the lens assembly includes a first lens and a second lens. A first pressure ring is provided on the side of the first lens away from the fixed plate, and a second pressure ring is provided on the side of the second lens away from the fixed plate. A third lens is attached to the second lens. A lens mount is provided inside the middle lens barrel, and a fourth lens is provided on the lens mount.

[0012] By adopting the above technical solution, the four lenses in the lens assembly cooperate with each other to ensure the transmission and measurement accuracy of the wind measurement laser. The second and third lenses are directly attached to each other to reduce stray light interference. The fourth lens is fixed in the middle lens barrel by a lens mount, which can accurately ensure the installation accuracy. The first and second pressure rings respectively press the first and second lenses to form an axial rigid constraint, preventing the lenses from axial displacement or loosening in the vibration environment of outdoor wind measurement, thus avoiding affecting the accuracy of the measurement. Each lens is installed independently through pressure rings and lens mounts and can be replaced individually, avoiding mutual interference during overall assembly. When the lens needs to be cleaned or is worn or scratched, it can be replaced by cleaning and inspecting the lens separately before reassembly, or by removing the corresponding pressure ring or lens mount, without disassembling the entire lens assembly. This makes maintenance and disassembly convenient, improves maintenance efficiency, and avoids scratches caused by friction between the lens edges and the shell during assembly or use.

[0013] Optionally, the housing includes a rear lens barrel, on which an adjusting handwheel assembly is provided. The adjusting handwheel assembly is used to fix the rear lens barrel to the middle lens barrel, and the optical fiber is located at the end of the rear lens barrel away from the middle lens barrel.

[0014] By adopting the above technical solution, the adjustment handwheel assembly can achieve fine adjustment of the rear and middle lens barrels through rotation, which can accurately calibrate the coaxiality of the rear and middle lens barrels, ensure that the optical axes of the lenses in the rear and middle lens barrels are completely aligned, avoid connection deviations, and improve the pointing accuracy of the wind measurement laser. The adjustment handwheel assembly improves the precise locking force, avoids stress concentration caused by traditional bolt tightening, prevents lens barrel deformation, and helps the adjustment handwheel assembly to achieve quick disassembly and installation of the rear and middle lens barrels.

[0015] Optionally, the fixing plate has connecting holes, through which bolts are passed to connect to the gimbal; An elastic abutment is provided at the end of the front lens barrel away from the fixed plate, and the elastic abutment is tightly abutted against the gimbal.

[0016] By adopting the above technical solution, the bolts pass through the connecting holes of the fixing plate and are directly fixed to the gimbal, forming a dual constraint of axial and radial directions. The elastic abutment at the front end of the lens barrel is pressed against the gimbal, generating a continuous preload force. This prevents the lens assembly from rotating circumferentially or moving axially under external vibrations such as gimbal rotation and wind impact, enhancing the stability of the gimbal, housing, and fixing plate, and ensuring measurement accuracy. The preload force of the elastic abutment, combined with the positioning effect of the bolts, makes the center of gravity of the lens assembly closer to the gimbal rotation axis, further reducing the difficulty of gimbal balancing and avoiding disturbance to the optical axis during balancing. At the same time, the bolt connection installation method, combined with the guiding and pressing effect of the elastic abutment, allows for precise positioning of the lens assembly without complex tooling, enabling rapid positioning and installation and improving assembly and disassembly efficiency. After the elastic abutment is pressed against the gimbal, a sealing barrier is formed between the lens assembly and the gimbal, preventing outdoor wind, sand, dust, and other pollutants from entering the connection gap and contaminating the lens surface.

[0017] Optionally, the fixing plate is provided with a plurality of first heat dissipation holes, which are located on the inner side of the connecting hole near the front lens barrel; The front lens barrel is provided with a plurality of second heat dissipation holes, which are arranged through the connection between the front lens barrel and the second lens and the third lens.

[0018] By adopting the above technical solution, the first heat dissipation hole connects the shell inside the gimbal with the external air, providing a heat conduction path and accelerating the air circulation around the first heat dissipation hole. The second heat dissipation hole connects the front lens barrel with the second and third lenses, forming a convection heat dissipation channel to directly dissipate heat from the laser transmission heat-generating area. The second heat dissipation hole quickly dissipates the heat from the lens, improving heat dissipation efficiency, avoiding changes in refractive index between lenses due to temperature differences, and ensuring stable measurement accuracy.

[0019] Optionally, a heat dissipation channel is provided on the front lens barrel, a heat dissipation fin is provided on the heat dissipation channel, the heat dissipation fin covers the heat dissipation channel, and a sealing strip is provided between the heat dissipation channel and the heat dissipation fin.

[0020] By adopting the above technical solution, the heat sink and sealing strip covering the channel form a sealing layer to seal the heat dissipation channel and the tiny gap between the heat sink and the housing, effectively blocking the intrusion of impurities such as wind, sand, and dust, preventing external humid air from entering the lens barrel, avoiding the formation of water droplets on the lens surface, and ensuring stable optical transmittance; the heat dissipation channel in the front lens barrel directly guides the heat generated by the lens to the heat sink and quickly dissipates it from the heat sink, forming a rapid heat conduction path. While blocking the entry of contaminants, the heat sink and sealing strip ensure efficient heat conduction of the heat dissipation channel, achieving a dual guarantee of heat dissipation efficiency and sealing performance.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. A fixing plate is mounted on the housing, forming a stable connection with the gimbal. This allows part of the housing and some of the internal mirror assemblies to be installed inside the gimbal. One end of the housing extends into the gimbal, bringing the overall center of gravity closer to the gimbal's rotation axis. The weight of the housing portion located outside the gimbal is reduced, preventing the entire housing and mirror assemblies from being positioned outside the gimbal. This prevents the center of gravity from shifting due to concentrated weight at the ends during lidar antenna operation. By placing part of the housing and mirror assemblies inside the gimbal, the center of gravity of the lidar is readjusted, significantly reducing the difficulty of gimbal adjustment and balancing, ensuring antenna stability during operation, and improving the accuracy of lidar antenna detection. Bolts pass through the connecting holes of the fixing plate and are directly fixed to the gimbal, forming a double constraint in both axial and radial directions. The elastic abutment at the front mirror barrel end abuts against the gimbal. The tightness generates a continuous preload, preventing the lens assembly from rotating circumferentially or moving axially under external vibrations such as gimbal rotation and wind impact. This enhances the stability of the gimbal, housing, and mounting plate, ensuring measurement accuracy. The preload of the elastic abutment, combined with the positioning effect of the bolts, brings the lens assembly's center of gravity closer to the gimbal's rotation axis, further reducing the difficulty of gimbal balancing and preventing disturbance to the optical axis during balancing. Simultaneously, the bolt connection installation method, combined with the guiding and tightening effect of the elastic abutment, allows for precise positioning of the lens assembly without complex tooling, enabling rapid positioning and installation and improving assembly and disassembly efficiency. After the elastic abutment is tightened against the gimbal, it forms a sealed barrier between the lens assembly and the gimbal, preventing outdoor wind, sand, dust, and other contaminants from entering the connection gap and contaminating the lens surface.

[0022] 2. The fixing plate is set on the stepped platform. One side of the stepped platform provides a circumferential platform support structure for the fixing plate, and the other side of the stepped platform provides a fixing contact surface for the fixing plate. This helps to increase the contact area between the fixing plate and the front lens barrel, ensuring that the fixing plate is stably connected to the front lens barrel, improving the stability of the connection between the two, and preventing the fixing plate from shaking due to vibrations or other external forces when the lidar antenna is working, thus avoiding affecting the detection accuracy of the lidar antenna. The second limiting protrusion abuts against one end of the stepped platform. The stepped platform restricts excessive advancement during the installation of the middle lens barrel, and the first limiting protrusion further limits the middle lens barrel, effectively preventing the middle lens barrel from colliding with the lens during installation, avoiding collisions that could cause the lens to move, and preventing the middle lens barrel from colliding with the lens and causing scratches. At the same time, the second limiting protrusion abuts against the stepped platform, ensuring that the stepped platform provides stable support for the fixing plate.

[0023] 3. The four lenses in the lens assembly work together to ensure the transmission and measurement accuracy of the wind measurement laser. The second and third lenses are directly bonded to reduce stray light interference. The fourth lens is fixed inside the central lens barrel by a lens mount, which precisely ensures the installation accuracy. The first and second pressure rings respectively press the first and second lenses, forming an axial rigid constraint to prevent axial displacement or loosening of the lenses in the vibration environment of outdoor wind measurement, thus avoiding affecting the accuracy of the measurement. Each lens is installed independently through pressure rings and lens mounts, and can be replaced individually, avoiding mutual interference during overall assembly. When the lenses need cleaning or show wear or scratches, only the individual lenses need cleaning. After cleaning and inspection, the lens can be reassembled or replaced by removing the corresponding pressure ring or lens mount without disassembling the entire lens assembly. This makes maintenance and disassembly convenient and improves maintenance efficiency. It also avoids scratches caused by friction between the lens edge and the housing during assembly or use. The adjustment handwheel assembly allows for fine-tuning of the rear and middle lens barrels through rotation. It can accurately calibrate the coaxiality of the rear and middle lens barrels, ensuring that the optical axes of the lenses in the rear and middle lens barrels are completely aligned, avoiding connection deviations and improving the pointing accuracy of the wind measurement laser. The adjustment handwheel assembly improves the precise locking force, avoiding stress concentration caused by traditional bolt tightening, preventing lens barrel deformation, and also facilitates the quick disassembly and installation of the rear and middle lens barrels.

[0024] 4. The first heat dissipation hole connects the housing inside the gimbal with the external air, providing a heat conduction path and accelerating air circulation around the first heat dissipation hole. The second heat dissipation hole connects the front lens barrel with the second and third lenses, forming a convection heat dissipation channel to directly dissipate heat from the laser transmission heat-generating area. The second heat dissipation hole quickly dissipates heat from the lenses, improving heat dissipation efficiency and preventing changes in refractive index between lenses due to temperature differences, ensuring stable measurement accuracy. The heat sink and sealing strip covering the channel form a sealing layer to seal the heat dissipation channel and the tiny gap between the heat sink and the housing, effectively blocking the intrusion of impurities such as wind, sand, and dust, preventing external humid air from entering the lens barrel, avoiding water droplets on the lens surface, and ensuring stable optical transmittance. The heat dissipation channel inside the front lens barrel directly guides the heat generated by the lenses to the heat sink and quickly dissipates it from the heat sink, forming a rapid heat conduction path. The heat sink and sealing strip, while blocking contaminants from entering, ensure efficient heat conduction of the heat dissipation channel, achieving dual protection of heat dissipation efficiency and sealing performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0026] Figure 2 This is a cross-sectional structural diagram of the lens assembly used in an embodiment of this application.

[0027] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0028] Figure 4 yes Figure 2 Enlarged schematic diagram of part B.

[0029] Figure 5 This is a schematic diagram illustrating the structure of the fixing plate in an embodiment of this application.

[0030] Figure 6 yes Figure 2 An enlarged schematic diagram of section C.

[0031] Figure 7 yes Figure 2 An enlarged schematic diagram of part D in the middle.

[0032] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Front lens barrel; 111. Stepped platform; 112. First limiting protrusion; 113. Elastic abutment; 114. Second heat dissipation hole; 115. Heat dissipation channel; 116. Heat sink; 117. Sealing strip; 118. Locking platform; 12. Middle lens barrel; 121. Second limiting protrusion; 13. Rear lens barrel; 2. Fixing plate; 21. Connecting hole; 22. First heat dissipation hole; 23. Bolt hole; 3. Lens assembly; 31. First lens; 32. First pressure ring; 33. Second lens; 34. Second pressure ring; 35. Third lens; 36. Fourth lens; 37. Lens mount; 4. Optical fiber; 5. Adjustment handwheel assembly; 51. Adjustment seat; 52. Threaded knob; 521. Abutment protrusion; 53. Support seat; 531. Abutment groove; 54. Spring; 55. Mounting seat. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0034] This application discloses a large-aperture transmission-type ultrashort lidar antenna.

[0035] like Figure 1 The large-aperture transmission-type ultrashort lidar antenna includes a housing 1, which includes a front lens tube 11, a middle lens tube 12, and a rear lens tube 13. The front lens tube 11 is located at the end of the housing 1, and the middle part of the front lens tube 11 is a horn-shaped cylindrical structure, while the two ends of the front lens tube 11 are cylindrical structures. The middle lens tube 12 is located between the front lens tube 11 and the rear lens tube 13. The end of the middle lens tube 12 near the front lens tube 11 is a horn-shaped cylindrical structure, and the end of the middle lens tube 12 near the rear lens tube 13 is a cylindrical structure. A fixing plate 2 is provided between the front lens tube 11 and the middle lens tube 12. The fixing plate 2 is a ring structure and is sleeved at the connection between the front lens tube 11 and the middle lens tube 12. The fixing plate 2 is connected to a gimbal so that the front lens tube 11 is located inside the gimbal. The rear lens tube 13 is located at the end of the housing 1 away from the front lens tube 11, and an optical fiber 4 is installed at the end of the rear lens tube 13 away from the middle lens tube 12.

[0036] like Figure 2 and Figure 3 The front lens barrel 11 is provided with a lens group 3, which includes a first lens 31. The first lens 31 is located on the cylinder with a larger diameter of the front lens barrel 11. A mounting plate 118 is provided at the connection between the cylinder with a larger diameter and the flared cylinder of the front lens barrel 11. The first lens 31 is abutted on the mounting plate 118. The first lens 31 has a circular structure. The peripheral side of the first lens 31 is abutted and fitted with the front lens barrel 11. A first pressure ring 32 is provided on the side of the first lens 31 away from the flared cylinder structure of the front lens barrel 11. The first pressure ring 32 has a circular structure and is located inside the front lens barrel 11 and fitted with the front lens barrel 11. An elastic abutment 113 is fixedly installed on the outer wall of the cylinder at the larger diameter part of the front lens barrel 11. The elastic abutment 113 has a ring structure and an arc structure. The elastic abutment 113 is integrally formed with the front lens barrel 11. The elastic abutment 113 is set towards the middle lens barrel 12 and is pressed against the gimbal. The front lens barrel 11 has a funnel-shaped cylindrical structure with a heat dissipation channel 115. The heat dissipation channel 115 has a trapezoidal structure and a heat dissipation fin 116 is provided on the heat dissipation channel 115. The heat dissipation fin 116 has a trapezoidal structure and covers the heat dissipation channel 115. A sealing strip 117 is provided at the connection between the heat dissipation fin 116 and the heat dissipation channel 115. The sealing strip 117 has a trapezoidal annular structure and is tightly fitted to the edge of the heat dissipation fin 116 and the edge of the heat dissipation channel 115.

[0037] like Figure 2 and Figure 4 A stepped platform 111 is provided at the end of the front lens barrel 11 away from the elastic abutment member 113. A third lens 35 is provided inside the stepped platform 111. The third lens 35 has a circular structure, and its edge abuts against the vertical surface of the stepped platform 111. The side of the third lens 35 is attached to the front lens barrel 11. A second lens 33 is provided on the side of the third lens 35 near the first lens 31. The second lens 33 has a circular structure and its side is attached to the edge of the third lens 35. The second lens 33 is provided with a second pressure ring 34 on the side of the second lens 33 near the first lens 31. The second lens 33 and the third lens 35 are located between the second pressure ring 34 and the stepped platform 111. The second pressure ring 34 has a circular structure and is located inside the front lens barrel 11 and fits against the front lens barrel 11. The front lens barrel 11 has several second heat dissipation holes 114. The second heat dissipation holes 114 are arranged around the side wall of the front lens barrel 11 and pass through the connection between the front lens barrel 11 and the second lens 33 and the third lens 35. The fixing plate 2 is located outside the stepped platform 111. The inner circumferential wall of the fixing plate 2 is located on the horizontal plane of the stepped platform 111. The side wall of the fixing plate 2 abuts against the vertical plane of the stepped platform 111. The fixing plate 2 is fixedly connected to the stepped platform 111. A first limiting protrusion 112 is fixedly provided on the stepped platform 111. The first limiting protrusion 112 is located inside the front lens barrel 11. The first limiting protrusion 112 has a circular structure and is integrally formed with the stepped platform 111. 2 is fitted to the third lens 35. The horizontal surface of the stepped platform 111 is placed on the end of the middle lens barrel 12 and abuts against it. The stepped platform 111 is fixedly connected to the middle lens barrel 12. A second limiting protrusion 121 is provided at one end of the middle lens barrel 12 near the fixing plate 2. The second limiting protrusion 121 is located outside the middle lens barrel 12 and has a circular structure. The second limiting protrusion 121 is integrally formed with the middle lens barrel 12. The end of the stepped platform 111 abuts against the second limiting protrusion 121.

[0038] like Figure 4 and Figure 5 The fixing plate 2 has a circular structure. In this embodiment, the fixing plate 2 has a flange structure. The fixing plate 2 has several bolt holes 23. The bolt holes 23 are evenly distributed along the circumference of the fixing plate 2. The bolts pass through the bolt holes 23 and are fixedly connected to the front lens barrel 11. The fixing plate 2 has several connecting holes 21. The connecting holes 21 are evenly distributed along the circumference of the fixing plate 2. The connecting holes 21 are located on the side of the circumference of the fixing plate 2. The bolts pass through the connecting holes 21 and are connected to the gimbal. The fixing plate 2 has several first heat dissipation holes 22. The first heat dissipation holes 22 are evenly distributed along the circumference of the fixing plate 2. The first heat dissipation holes 22 are located between the connecting holes 21 and the bolt holes 23 on the circumference of the fixing plate 2.

[0039] like Figure 2 and Figure 6 The middle lens barrel 12 is a cylindrical structure with a lens mount 37 inside one end. The lens mount 37 is a ring-shaped structure and a fourth lens 36 is mounted on the lens mount 37. The lens mount 37 holds the fourth lens 36 inside the middle lens barrel 12. The fourth lens 36 is a circular structure and its peripheral sidewall is fitted to the lens mount 37. The middle lens barrel 12 and the rear lens barrel 13 are fixedly connected by bolts.

[0040] like Figure 2 and Figure 7An adjustment handwheel assembly 5 is provided on the rear lens barrel 13. The adjustment handwheel assembly 5 includes an adjustment seat 51, which is a cylindrical structure. The adjustment seat 51 is threadedly connected to the end of the rear lens barrel 13 away from the middle lens barrel 12. A threaded knob 52 is fixedly provided at the end of the adjustment seat 51 away from the middle lens barrel 12. The threaded knob 52 is located on the outside of the adjustment seat 51. An abutment protrusion 521 is provided at the end of the threaded knob 52 away from the rear lens barrel 13. The abutment protrusion 521 is an annular structure and is integrally formed with the threaded knob 52. The adjustment seat 51... A support seat 53 is slidably provided inside. The support seat 53 is a cylindrical structure. An abutment groove 531 is provided at one end of the support seat 53 near the rear lens barrel 13. A spring 54 is fixedly provided at one end of the rear lens barrel 13 near the adjustment seat 51. One end of the spring 54 is fixedly connected to the rear lens barrel 13, and the other end of the spring 54 abuts against the abutment groove 531 on the support seat 53. The support seat 53 is located between the spring 54 and the abutment protrusion 521. A mounting seat 55 is fixedly provided at the end of the support seat 53 away from the spring 54. The optical fiber 4 is mounted on the mounting seat 55.

[0041] In other embodiments, the housing 1 may include only the front lens barrel 11 and the rear lens barrel 13, or it may include other lens barrels. The front lens barrel 11 may include only the first lens 31, or it may include the first lens 31 and the second lens 33, or it may include the first lens 31, the second lens 33, the third lens 35 and the fourth lens 36. The fixing plate 2 may also be disposed between the middle lens barrel 12 and the rear lens, or the fixing plate 2 may be fixedly disposed in the middle position of the middle lens barrel 12. The heat dissipation channel 115 may be annular, the heat dissipation fin 116 may be an annular cylindrical structure, and the fixing plate 2 may be a rounded square structure or other shapes.

[0042] The implementation principle of this application embodiment is as follows: The fixing plate 2 is set on the housing 1, and the fixing plate 2 forms a stable connection with the gimbal, so that part of the housing 1 and part of the mirror group 3 inside the housing 1 are installed inside the gimbal. One end of the housing 1 extends into the gimbal, so that the overall center of gravity is close to the rotation axis of the gimbal. The weight of the part of the housing 1 located outside the gimbal is reduced, avoiding the entire housing 1 and mirror group 3 being located outside the gimbal, preventing the center of gravity from shifting due to the weight concentration at the end when the lidar antenna is working. Setting part of the housing 1 and part of the mirror group 3 inside the gimbal, the center of gravity position of the lidar is readjusted, which significantly reduces the difficulty of gimbal debugging and balancing, ensures the stability of the antenna during operation, and improves the detection accuracy of the lidar antenna; the bolt passes through the connecting hole 21 of the fixing plate 2 and is directly fixed to the gimbal, forming a double constraint of axial and radial direction. The elastic abutment part at the end of the front mirror barrel 11 The elastic abutment 113, when pressed against the gimbal, generates a continuous preload, preventing the lens assembly 3 from rotating circumferentially or moving axially under external vibrations such as gimbal rotation and wind impact. This enhances the stability of the gimbal, housing 1, and fixing plate 2, ensuring measurement accuracy. The preload of the elastic abutment 113, combined with the positioning effect of the bolts, brings the center of gravity of the lens assembly 3 closer to the gimbal rotation axis, further reducing the difficulty of gimbal balancing and preventing disturbance to the optical axis during balancing. Simultaneously, the bolt connection installation method, combined with the guiding and abutting effect of the elastic abutment 113, allows for precise positioning of the lens assembly 3 without complex tooling, enabling rapid positioning and installation and improving assembly and disassembly efficiency. After the elastic abutment 113 is pressed against the gimbal, it forms a sealed barrier between the lens assembly 3 and the gimbal, preventing outdoor wind, sand, dust, and other pollutants from entering the connection gap and contaminating the lens surface inside the lens assembly 3.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-aperture transmission-type ultrashort lidar antenna, characterized in that: Includes a housing (1), on which a fixing plate (2) is provided, the fixing plate (2) is used to connect with a gimbal, so that one end of the housing (1) is located inside the gimbal, a lens assembly (3) is provided inside the housing (1), and an optical fiber (4) is provided at the end of the housing (1) away from the gimbal.

2. The large-aperture transmission-type ultrashort lidar antenna according to claim 1, characterized in that: The housing (1) includes a front lens barrel (11), and a stepped platform (111) is provided at one end of the front lens barrel (11) near the fixed plate (2). The fixed plate (2) is located on the stepped platform (111), and the fixed plate (2) is fixedly connected to the stepped platform (111).

3. The large-aperture transmission-type ultrashort lidar antenna according to claim 2, characterized in that: A first limiting protrusion (112) is fixedly provided on the stepped platform (111). The housing (1) includes a middle lens tube (12). A second limiting protrusion (121) is fixedly provided at one end of the middle lens tube (12) near the fixing plate (2). The second limiting protrusion (121) abuts against the stepped platform (111).

4. The large-aperture transmission-type ultrashort lidar antenna according to claim 3, characterized in that: The lens assembly (3) includes a first lens (31) and a second lens (33). A first pressure ring (32) is provided on the side of the first lens (31) away from the fixed plate (2). A second pressure ring (34) is provided on the side of the second lens (33) away from the fixed plate (2). A third lens (35) is attached to the second lens (33). A lens mount (37) is provided inside the middle lens barrel (12). A fourth lens (36) is provided on the lens mount (37).

5. The large-aperture transmission-type ultrashort lidar antenna according to claim 3, characterized in that: The housing (1) includes a rear lens barrel (13), and an adjustment handwheel assembly (5) is provided on the rear lens barrel (13). The adjustment handwheel assembly (5) is used to fix the rear lens barrel (13) to the middle lens barrel (12). The optical fiber (4) is located at the end of the rear lens barrel (13) away from the middle lens barrel (12).

6. The large-aperture transmission-type ultrashort lidar antenna according to claim 4, characterized in that: The fixing plate (2) has a connecting hole (21), and the bolt passes through the connecting hole (21) to connect with the gimbal; The front lens barrel (11) is provided with an elastic abutment (113) at one end away from the fixed plate (2), and the elastic abutment (113) is abutted against the gimbal.

7. The large-aperture transmission-type ultrashort lidar antenna according to claim 6, characterized in that: The fixing plate (2) is provided with a plurality of first heat dissipation holes (22), and the first heat dissipation holes (22) are located on the inner side of the connecting hole (21) near the front lens barrel (11); The front lens barrel (11) is provided with a plurality of second heat dissipation holes (114), which are provided through the connection between the front lens barrel (11) and the second lens (33) and the third lens (35).

8. The large-aperture transmission-type ultrashort lidar antenna according to claim 2, characterized in that: A heat dissipation channel (115) is provided on the front lens barrel (11), and a heat dissipation fin (116) is provided on the heat dissipation channel (115). The heat dissipation fin (116) covers the heat dissipation channel (115), and a sealing strip (117) is provided between the heat dissipation channel (115) and the heat dissipation fin (116).

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