Near-ground different-angle wind field laser wind measurement radar antenna and wind measurement laser radar

Abstract

The invention relates to a near-ground different-angle wind field laser wind measurement radar antenna and a wind measurement laser radar, and relates to the technical field of laser wind measurement, and the near-ground different-angle wind field laser wind measurement radar antenna comprises an optical lens, a channel seat, a flange adjusting assembly and an optical fiber connector. An objective lens group composed of a plurality of lenses is arranged in the optical lens, one end of the channel seat is connected with the optical lens, a flange seat mounting plate is arranged at the other end of the channel seat, the flange adjusting assembly comprises a middle flange assembly and a plurality of peripheral flange assemblies, and the middle flange assembly is arranged in the middle of the flange seat mounting plate. An optical fiber connector is arranged at the end part of the middle flange assembly to form a middle view field channel; the multiple peripheral flange assemblies are arranged at different positions of the lower portion of the flange base mounting plate in a scattered mode, the end of each peripheral flange assembly is provided with an optical fiber connector, multiple peripheral view field channels are formed, and the measurement effect of the near-ground wind field can be improved.

Description

Technical Field

[0001] This application relates to the technical field of laser wind measurement, and in particular, to a near-surface laser wind measurement radar antenna with different angles of wind fields. In addition, this application also relates to a wind measurement lidar. Background Art

[0002] Based on the Doppler measurement principle, a lidar emits a laser beam into the atmosphere and measures the relative movement direction and speed of atmospheric particles by using the change in the laser frequency generated after the atmospheric particles reflect the laser light, so as to measure the direction and speed of the wind field. Lidars are widely used in the field of real-time perception of atmospheric wind fields. Among them, the lidar antenna is used to transmit and receive optical signals and is one of the key components of the wind measurement lidar.

[0003] In order to obtain spatial three-dimensional wind field (horizontal wind speed, vertical wind speed, wind direction) information, it is usually necessary to emit multiple laser beams to different positions in the air, use at least four independent beam directions, and solve the wind field parameters through a vector synthesis algorithm. This requires at least four laser emission and reception channels to be set on the lidar antenna. Each channel points to a different angle in the air. Through at least four independent beam directions, the three-dimensional wind field parameters are solved by using the vector synthesis algorithm. While improving the measurement accuracy, the reliability of the wind measurement lidar is enhanced through redundant design. The multi-channel lidar antenna can use a fixed antenna to realize the transmission and reception of multiple laser beams at different angles in space, detect the real-time wind field in three-dimensional space, and does not require an antenna rotation mechanism, which simplifies the system structure and reduces the system volume, so it has been widely used.

[0004] In the existing multi-channel lidar antennas for wind measurement, multiple laser channels are usually symmetrically arranged around the optical axis of the optical lens. The included angle formed by each laser channel and the optical axis of the optical lens is the same, and the wind fields in different regions around the optical lens can be evenly measured. When the existing multi-channel lidar antenna is used to measure the near-surface wind field, at least one channel's laser beam points to the ground and cannot measure the wind field, reducing the measurement effect on the near-surface wind field. Summary of the Invention

[0005] In order to improve the measurement effect on the near-surface wind field, this application provides a near-surface laser wind measurement radar antenna with different angles of wind fields and a wind measurement lidar.

[0006] The near-surface laser wind measurement radar antenna with different angles of wind fields provided by this application adopts the following technical solutions: A near-ground wind field laser anemometer radar antenna with different angles includes an optical lens, a channel base, a flange adjustment assembly, and an optical fiber connector. An objective lens group composed of multiple lenses is arranged in the optical lens. One end of the channel base is connected to the optical lens, and a flange base mounting plate is arranged at the other end. The flange adjustment assembly includes a central flange assembly and multiple peripheral flange assemblies. The central flange assembly is arranged in the middle of the flange base mounting plate, and the optical fiber connector is arranged at the end of the central flange assembly, forming a central field of view channel. The multiple peripheral flange assemblies are dispersedly arranged at different positions below the flange base mounting plate, and the optical fiber connector is arranged at the end of each peripheral flange assembly, forming multiple peripheral fields of view channels.

[0007] By adopting the above technical solution, using the central flange assembly arranged in the middle of the flange base mounting plate and the optical fiber connector connected thereto, a central field of view channel with a smaller included angle with the optical axis of the objective lens group can be formed, which is used for measuring the wind field in the near-ground space in front of the optical lens. By using multiple peripheral flange assemblies dispersedly arranged at different positions below the flange base mounting plate, multiple peripheral fields of view channels pointing to different regions in front of and above the optical lens can be formed, which are used for measuring the wind field in the near-ground space at different angles in front of and above the optical lens, so that all the fields of view channels point to the near-ground airspace on and above the optical axis of the optical lens, improving the measurement effect of different regions of the near-ground wind field.

[0008] In a specific feasible implementation, the central flange assembly and the optical fiber connector at its end are both arranged on the optical axis of the objective lens group.

[0009] By adopting the above technical solution, using the central flange assembly arranged on the optical axis of the objective lens group and the optical fiber connector connected thereto, the central field of view channel can be arranged on the optical axis of the objective lens group. The included angle between the laser beam emitted through the central field of view channel and the object surface is zero, improving the measurement accuracy of the normal turbulence intensity and wind speed.

[0010] In a specific feasible implementation, the peripheral flange assembly includes a first side flange assembly, a second side flange assembly, and a bottom flange assembly. The first side flange assembly and the second side flange assembly are respectively arranged on both sides in the horizontal direction of the central flange assembly, and the bottom flange assembly is arranged directly below the central flange assembly. The included angles between the first side flange assembly, the second side flange assembly, and the bottom flange assembly and the central flange assembly are equal.

[0011] By adopting the above technical solution, by using the first side flange assembly and the second side flange assembly respectively arranged on both sides in the horizontal direction of the middle flange assembly, the wind fields in the near-ground spaces on the left and right sides in front of the optical lens can be measured; by using the bottom flange assembly arranged directly below the middle flange assembly, the wind field in the upper space in front of the optical lens can be measured, forming the wind field measurement of multiple different regions in the near-ground space in front of the optical lens, and further improving the measurement effect of the near-ground wind field.

[0012] In a specific feasible implementation scheme, the object surface angle of the peripheral wind measurement field-of-view channel formed by the first side flange assembly, the second side flange assembly and the bottom flange assembly is 0-15°.

[0013] By adopting the above technical solution, by using the object surface angle of 0-15° of the peripheral wind measurement field-of-view channel formed by the first side flange assembly, the second side flange assembly and the bottom flange assembly, which is matched with the object surface angle of 0° of the middle wind measurement field-of-view channel formed by the middle flange assembly, it is more suitable for measuring the wind field in the near-ground space and optimizing the measurement effect of the near-ground space wind field.

[0014] In a specific feasible implementation scheme, the objective lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence from the light-emitting port direction to the channel seat direction. The first lens and the second lens are both semi-circular convex lenses, the third lens is a semi-circular concave lens, the fourth lens is a double convex lens. The convex surface of the second lens is arranged adjacent to the concave surface of the first lens, and the convex surface of the third lens faces the second lens.

[0015] By adopting the above technical solution, by using the settings that the first lens and the second lens are both semi-circular convex lenses, the third lens is a semi-circular concave lens, the fourth lens is a double convex lens, and the convex surface of the second lens is adjacent to the concave surface of the first lens, and the convex surface of the third lens faces the second lens, on the one hand, the first lens, the second lens and the third lens can cooperate with each other to perform focusing while participating in eliminating aberration, and the fourth lens is used for focusing. In the case of the same working focal length, the length of the optical system is greatly shortened; on the other hand, by setting the different shapes of each lens, the changes in curvature and thickness caused by temperature changes of the lens itself are used to reversely compensate for the changes in the distance between lenses caused by temperature changes, improving the stability of the optical performance of the objective lens group.

[0016] In a specific feasible implementation, the optical lens further includes an objective lens barrel, which includes a light-emitting port section, a tapered section, and a channel section. The first lens is disposed within the light-emitting port section, and an objective lens retaining ring is provided on the light-emitting port side of the first lens. The second lens is disposed in the connection region between the tapered section and the light-emitting port section, and a first spacer is provided between the first lens and the second lens. The third lens and the fourth lens are disposed within the channel section, and a second retaining ring is provided on the side of the third lens adjacent to the tapered section. A second spacer is provided between the third lens and the fourth lens, and the channel section is threadedly connected to the channel seat.

[0017] By adopting the above technical solution, with the first lens disposed within the light-emitting port section, the second lens disposed in the connection region between the tapered section and the light-emitting port section, and the third lens and the fourth lens disposed within the channel section, the diameter of the first lens is made larger than that of the second lens, and the diameter of the second lens is significantly larger than those of the third lens and the fourth lens. On the one hand, the changes in the curvature and thickness of each lens at different temperatures are controlled, and on the other hand, the light-emitting aperture of the objective lens group is increased, improving the measurement resolution.

[0018] In a specific feasible implementation, the side of the second retaining ring adjacent to the third lens extends towards the center of the third lens to form a diaphragm, and the central axes of the central flange assembly and the peripheral flange assembly intersect at the center of the diaphragm.

[0019] By adopting the above technical solution, by using the diaphragm provided on the side of the second retaining ring adjacent to the third lens, the marginal aberration of the optical system can be optimized, the light-passing aperture can be constrained, and at the same time, the influence of ambient stray light on the optical system can be reduced. With the central axes of the central flange assembly and the peripheral flange assembly intersecting at the center of the diaphragm, the central field channel formed by the central flange assembly and the peripheral field channel formed by the peripheral flange assembly can both have excellent optical performance.

[0020] In a specific feasible implementation, the flange adjustment assembly includes a channel seat connecting sleeve, a flange connecting sleeve, a compression spring, and a focusing knob. The channel seat connecting sleeve is fixed on the flange seat mounting plate. One end of the flange connecting sleeve is slidably disposed within the channel seat connecting sleeve, and the other end is provided with an optical fiber connecting flange. The compression spring is disposed between the channel seat connecting sleeve and the flange connecting sleeve. The focusing knob is sleeved on the end of the flange connecting sleeve and is threadedly connected to the channel seat connecting sleeve. A flange hole is provided at the end of the focusing knob such that the optical fiber connecting flange is located within the flange hole.

[0021] By adopting the above technical solution, with one end of the flange connecting sleeve slidably arranged in the channel seat connecting sleeve and the focusing knob sleeved on the other end of the flange connecting sleeve, it is possible to conveniently adjust the length of the flange connecting sleeve nested in the channel seat connecting sleeve, thereby adjusting the position of the optical fiber light-emitting end in the optical fiber connector 4 in the channel seat connecting sleeve, and achieving individual focusing of the laser emitted through each field channel.

[0022] In a specific feasible implementation, an axially extending avoidance groove and a plurality of fixing screw holes are provided on the outer peripheral surface of the channel seat connecting sleeve. A fastening screw is threadedly connected in the fixing screw hole. An optical fiber fixing screw is threadedly connected to the flange connecting sleeve. The optical fiber fixing screw is correspondingly arranged with the avoidance groove, and an optical fiber protection pad is provided at the end of the optical fiber fixing screw.

[0023] By adopting the above technical solution, the position of the flange connecting sleeve nested in the channel seat connecting sleeve can be fixed by using the fixing screw holes provided on the outer peripheral surface of the channel seat connecting sleeve; the position of the end of the optical fiber in the optical fiber connector in the flange connecting sleeve can be fixed by using the optical fiber fixing screw in the avoidance groove of the flange connecting sleeve, thereby fixing the focusing state of the laser in the field channel and improving the stability of the laser anemometry result.

[0024] The laser anemometer provided by this application adopts the near-ground different-angle wind field laser anemometer antenna provided by this application, and also has the advantages of the near-ground different-angle wind field laser anemometer antenna of this application.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The central field channel close to the optical axis of the objective lens group can be formed by the central flange assembly provided in the middle of the flange seat mounting plate and the optical fiber connector connected to the end of the central flange assembly; the peripheral field channels at a set angle with the optical axis of the objective lens group can be formed by a plurality of peripheral flange assemblies dispersedly arranged at different positions in the lower part of the flange seat mounting plate and the optical fiber connectors connected to the ends of the peripheral flange assemblies, so that multiple field channels with two different working field angles can be formed simultaneously, meeting the laser anemometry requirements of the near-ground different-angle wind field and improving the measurement accuracy of the anemometer; 2. By specifically setting the shapes and materials of the first lens, the second lens, the third lens, and the fourth lens, the length of the optical system is greatly shortened. At the same time, the changes in curvature and thickness of the lens itself due to temperature changes are used to reversely compensate for the changes in the distance between the lenses due to temperature changes, improving the temperature stability of the optical performance of the objective lens group; 3. By setting a diaphragm on one side of the third lens, the marginal aberration of the optical system can be optimized, the light passing aperture can be constrained, and at the same time, the influence of ambient stray light on the optical system can be reduced. By setting the central axes of the central flange assembly and the peripheral flange assembly to intersect at the center position of the diaphragm, it can be ensured that both the central field of view channel formed by the central flange assembly and the peripheral field of view channel formed by the peripheral flange assembly have excellent optical performance. Brief Description of the Drawings

[0026] Figure 1 Schematic diagram of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0027] Figure 2 Schematic diagram of the distribution of multiple flange adjustment assemblies in an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0028] Figure 3 Schematic diagram of the internal structure of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0029] Figure 4 Schematic diagram of the horizontal optical path of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0030] Figure 5 Schematic diagram of the vertical optical path of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0031] Figure 6 Schematic diagram of the central field of view optical path of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0032] Figure 7 Schematic diagram of the peripheral field of view optical path of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0033] Figure 8 Schematic diagram of the central field of view pupil of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0034] Figure 9 Schematic diagram of the peripheral field of view pupil of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0035] Figure 10 Spot diagram of the central field of view of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0036] Figure 11 Spot diagram of the peripheral field of view of an embodiment of the near-surface multi-angle wind field lidar antenna of the present application.

[0037] Figure 12 It is a schematic diagram of the optical path of the middle field of view of another embodiment of the near-surface heter-angle wind field laser anemometer radar antenna of the present application.

[0038] Figure 13 It is a schematic diagram of the optical path of the peripheral field of view of another embodiment of the near-surface heter-angle wind field laser anemometer radar antenna of the present application.

[0039] Figure 14 It is a schematic diagram of the pupil of the middle field of view of another embodiment of the near-surface heter-angle wind field laser anemometer radar antenna of the present application.

[0040] Figure 15 It is a schematic diagram of the pupil of the peripheral field of view of another embodiment of the near-surface heter-angle wind field laser anemometer radar antenna of the present application.

[0041] Figure 16 It is a spot diagram of the middle field of view of another embodiment of the near-surface heter-angle wind field laser anemometer radar antenna of the present application.

[0042] Figure 17 It is a spot diagram of the peripheral field of view of an embodiment of the near-surface heter-angle wind field laser anemometer radar antenna of the present application.

[0043] Description of reference numerals: 1. Optical lens; 11. Objective lens group; 111. First lens; 112. Second lens; 113. Third lens; 114. Fourth lens; 12. Objective lens barrel; 121. Light exit port section; 122. Conical section; 123. Channel section; 13. Objective lens retaining ring; 14. First spacer ring; 15. Second retaining ring; 151. Diaphragm; 16. Second spacer ring; 2. Channel seat; 21. Flange seat mounting plate; 3. Flange adjustment assembly; 301. Channel seat connecting sleeve; 302. Flange connecting sleeve; 303. Compression spring; 304. Focus adjustment knob; 305. Avoidance groove; 306. Fastening screw; 307. Optical fiber fixing screw; 31. Middle flange assembly; 32. Peripheral flange assembly; 321. First side flange assembly; 322. Second side flange assembly; 323. Bottom flange assembly; 4. Optical fiber connector. Detailed Description of the Invention

[0044] The following will describe in detail the specific embodiments of the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present application, and are not intended to limit the present application.

[0045] In the present application, unless otherwise stated, the orientation terms such as "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship of the near-surface heter-angle wind field laser anemometer radar antenna of the present application during actual use. The description of the orientation and positional relationship of each component in the present application is the same as this.

[0046] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0047] In this specification, the terms "first", "second", "third", and "fourth" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the said features.

[0048] An embodiment of the near-surface non-uniform angle wind field lidar antenna of the present application, as Figure 1 and Figure 2 shown, includes an optical lens 1, a channel base 2, a flange adjustment assembly 3, and an optical fiber connector 4.

[0049] The optical lens 1 is used to focus the laser beam and emit it into the atmosphere, and receive and focus the laser light reflected by atmospheric particles. An objective lens group 11 composed of multiple lenses is arranged in the optical lens 1, and the multiple lenses in the objective lens group 11 are used to focus the laser light and suppress the deformation and dispersion generated during the focusing process.

[0050] The channel base 2 is connected between the optical lens 1 and multiple flange adjustment assemblies 3, and is used to introduce the laser beams from different flange adjustment assemblies 3 into the optical lens 1. The channel base 2 can not only define the installation positions and angles of the multiple flange adjustment assemblies 3, but also has a significant impact on the optical path length of the laser beam entering the optical lens 1 from the flange adjustment assembly 3. One end of the channel base 2 is open, and the other end is provided with a flange seat mounting plate 21. A plurality of mounting holes are provided on the flange seat mounting plate 21, including a central mounting hole provided in the middle position of the flange seat mounting plate 21, and several peripheral mounting holes scattered on both sides and below the central mounting hole on the flange seat mounting plate 21. The open end of the channel base 2 is connected to the optical lens 1, such as by a threaded connection.

[0051] The flange adjustment assembly 3 is an optical fiber plug installation and positioning mechanism capable of adjusting the position of the flange for connecting the optical fiber joint 4. One end of the flange adjustment assembly 3 is installed in the installation hole on the flange seat mounting plate 21, and the other end is connected to the optical fiber joint 4 through the flange. There are multiple flange adjustment assemblies 3, including a central flange assembly 31 and multiple peripheral flange assemblies 32. Among them, one end of the central flange assembly 31 is installed in the central installation hole, and the other end is connected to an optical fiber joint 4, capable of introducing a laser beam from the optical fiber joint 4 to form the central field of view channel of the lidar antenna; one end of each peripheral flange assembly 32 is installed in a peripheral installation hole respectively, and the other end is connected to an optical fiber joint 4 respectively, capable of introducing a laser beam from an optical fiber joint 4 to form multiple peripheral field of view channels of the lidar antenna.

[0052] The laser beam from the central field of view channel is incident on the optical lens 1 at a very small incident angle, and after being focused by the optical lens 1, it is incident on the front position of the optical lens 1 at a smaller object plane angle for measuring the near-surface wind field in front of the optical lens 1; the laser beams from the peripheral field of view channels on the left and right sides of the central field of view channel are incident on the optical lens 1 at a larger incident angle, and after being focused by the optical lens 1, they are incident on the spatial positions on both sides in front of the optical lens 1 at a set object plane angle for measuring the near-surface wind field in a larger range on both sides in front of the optical lens 1; the laser beam from the peripheral field of view channel below the central field of view channel is incident on the optical lens 1 at a larger incident angle, and after being focused by the optical lens 1, it is incident on the higher spatial position in front of the optical lens 1 at a set object plane angle for measuring the near-surface wind field in the higher area range in front of the optical lens 1, thereby forming the measurement of multiple different object plane angle wind fields in the near-surface space in front of the optical lens 1.

[0053] For the traditional multi-channel antenna, the object surface angles at which the laser beams of each channel are emitted through the optical lens are the same. The wind-measuring lasers from different channels are evenly distributed around the optical axis of the optical lens and are centrosymmetrically distributed with respect to the optical axis of the optical lens. Taking the antenna of a common four-channel lidar for wind measurement as an example, its four channels usually point to the upper left, lower left, upper right, and lower right of the optical lens respectively, and are used to measure the wind field in the sky within a relatively large range around the optical axis of the optical lens. Since the object surface angles at which the wind-measuring lasers of each channel are emitted from the optical lens are the same, the debugging of the optical lens is more convenient. However, when using this multi-channel antenna to measure the wind field in the near-ground space, if the optical lens is directed at a very small angle to the ground towards the near-ground space, the wind-measuring lasers of the two channels pointing to the lower left and lower right will be directed towards the ground and the wind field information cannot be measured. Only the two channels pointing to the upper left and upper right can be used for wind field measurement, which seriously affects the measurement effect of the near-ground wind field. If the angle between the optical lens and the ground is increased, the wind-measuring lasers of the channels pointing to the upper left and upper right will be directed to higher spatial positions, and only the wind-measuring lasers of the channels pointing to the lower left and lower right will be directed to the near-ground space for measuring the wind field in the near-ground space. This makes the effect of using the traditional multi-channel antenna to measure the wind field in the near-ground space not good. The near-ground wind field lidar antenna with different angles in this application is provided with two field-of-view channels with different object surface angles, namely the middle field-of-view channel and the peripheral field-of-view channels. The laser of the middle field-of-view channel is used to measure the wind field in the near-ground space in front of the optical lens, and the lasers of multiple peripheral field-of-view channels are used to measure the wind fields in the near-ground spaces on both sides and above in a relatively large range in front of the optical lens, so that the lasers of multiple field-of-view channels are concentrated in the near-ground space, effectively improving the measurement results of the wind field in different angular ranges in the near-ground space.

[0054] In some embodiments of the near-ground wind field lidar antenna with different angles in this application, such as Figure 2 and Figure 3 shown, the fiber optic connector 4 installed at the end of the middle flange assembly 31 is coaxially arranged with the middle flange assembly 31, and the central axes of both are arranged on the optical axis of the objective lens group 11, so that the laser beam introduced through the fiber optic connector 4 is emitted forward along the optical axis direction of the objective lens group 11, and the object surface angle of the beam emitted from the objective lens group 11 is zero. In this way, the near-ground wind field lidar antenna of this application can be horizontally installed at a certain height from the ground to measure the near-ground wind field.

[0055] In a preferred embodiment of the near-ground wind field lidar antenna with different angles in this application, such as Figure 2 and Figure 3As shown, the peripheral flange assembly 32 includes a first-side flange assembly 321, a second-side flange assembly 322, and a bottom flange assembly 323. The first-side flange assembly 321 and the second-side flange assembly 322 are respectively disposed on two sides of the middle flange assembly 31 in the horizontal direction, such that the wind-measuring lasers emitted through the middle flange assembly 31, the first-side flange assembly 321, and the second-side flange assembly 322 are all emitted onto the same horizontal plane in front of the optical lens 1, distributed within a larger range on the same horizontal plane, and capable of measuring the wind field in a larger range of near-ground space.

[0056] The bottom flange assembly 323 is disposed directly below the middle flange assembly 31, and the wind-measuring laser emitted through the bottom flange assembly 323 is emitted to a position above the front of the optical lens 1 to measure the wind field in the near-ground space at a slightly higher position, expanding the measurement range of the wind field in the near-ground space being measured.

[0057] The angles formed between the first-side flange assembly 321, the second-side flange assembly 322, the bottom flange assembly 323 and the middle flange assembly 31 are equal, such that the object-plane angles of the wind-measuring lasers emitted through the first-side flange assembly 321, the second-side flange assembly 322, and the bottom flange assembly 323 when exiting the optical lens 1 are the same. In this way, the refraction effect of the objective lens group 11 on the wind-measuring lasers emitted through the first-side flange assembly 321, the second-side flange assembly 322, and the bottom flange assembly 323 is the same, and thus they have the same optical performance and wind-measuring effect, simplifying the design and debugging of the objective lens group 11.

[0058] As a specific implementation manner of the near-ground different-angle wind-field laser anemometer radar antenna of the present application, as Figure 4 and Figure 5 shown, the object-plane angles of the laser beams when exiting the optical lens 1 in the peripheral field-of-view channels formed by the first-side flange assembly 321, the second-side flange assembly 322, and the bottom flange assembly 323 are the same, and can be set to any angle within the range of 0 - 15°, preferably set to 9 - 10°. The object-plane angle of 9 - 10° not only provides sufficient installation space for the first-side flange assembly 321, the second-side flange assembly 322, and the bottom flange assembly 323 and the middle flange assembly 31 on the flange seat mounting plate 21, but also enables the three peripheral field-of-view channels to be distributed within a smaller range to the left and right and above the middle field-of-view channel, concentrating the measurement of the near-ground wind field within a certain range and improving the measurement effect of the near-ground wind field.

[0059] In some embodiments of the near-ground different-angle wind-field laser anemometer radar antenna of the present application, as Figures 3 to 5 shown, the objective lens group 11 includes a first lens 111, a second lens 112, a third lens 113, and a fourth lens 114.

[0060] The first lens 111 is made of H-LAK59A optical material and is arranged near the light exit of the optical lens 1. It is a semi-circular convex lens with the convex surface on the side adjacent to the light exit (outer side) and the concave surface on the side away from the light exit (inner side).

[0061] The second lens 112 is made of H-ZF7LA or H-ZF7LAGT optical material and is a semi-circular convex lens with one convex surface and the other concave surface. The second lens 112 is arranged adjacent to the first lens 111, on the side where the channel base 2 of the first lens 111 is located, and the convex surface faces the concave surface of the first lens 111.

[0062] The third lens 113 is made of H-ZLAF53B optical material and is a semi-circular concave lens with a convex spherical surface with a larger radius of curvature on one side and a concave spherical surface with a smaller radius of curvature on the other side. The third lens 113 is arranged on the side where the channel base 2 of the second lens 112 is located, and the convex surface faces the second lens 112.

[0063] The fourth lens 114 is made of H-ZPK1A optical material and is a double convex lens with both surfaces convex outward. The fourth lens 114 is arranged on the side where the channel base 2 of the third lens 113 is located, that is, on the light incident side of the optical lens 1.

[0064] By setting the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114 with different materials and shapes, and arranging the first lens 111 and the second lens 112 close to each other, through the cooperation of the first lens 111, the second lens 112, and the third lens 113, while improving the focusing effect on the laser beam, the imaging aberration of the laser beam is effectively eliminated. Then, by using the focusing effect of the fourth lens and cooperating with the first lens 111, the second lens 112, and the third lens 113, the length of the optical system is greatly shortened under the condition of the same working focal length. Combining with the optimized design of the radian of the light incident surface of the fourth lens 114, the laser light incident through the middle flange assembly 31 and the laser light incident through the peripheral flange assembly 32 can both form good focusing and imaging, ensuring that the anemometry lasers emitted at two different object surface angles can both achieve good anemometry effects.

[0065] In a preferred embodiment of the near-surface heter-angle wind field laser anemometry radar antenna of the present application, as Figures 3 to 5As shown, the optical lens 1 further includes an objective lens barrel 12, and the objective lens group 11 is fixedly installed in the objective lens barrel 12. The objective lens barrel 12 includes a light outlet section 121, a tapered section 122, and a channel section 123. The light outlet section 121 is located at the light outlet end of the optical lens 1 and has a relatively large diameter, usually greater than 30 - 40 mm. The channel section 123 is located at one end where the optical lens 1 is connected to the channel base 2 and has a relatively small diameter, usually less than 20 mm. The tapered section 122 is located between the light outlet section 121 and the channel section 123 and extends from the light outlet section 121 with a larger diameter to the channel section 123 with a smaller diameter.

[0066] The first lens 111 is arranged in the light outlet section 121, and the second lens 112 is arranged in the connection area between the tapered section 122 and the light outlet section 121. A first spacer 14 is arranged between the first lens 111 and the second lens 112. An objective lens retaining ring 13 is arranged on the light outlet side of the first lens 111. The objective lens retaining ring 13 is threadedly connected to the inner wall of the light outlet section 121, pushes the first lens 111 towards the tapered section 122, and presses the second lens 112 against the end of the tapered section 122 through the first spacer 14, forming a pressing and fixing of the first lens 111 and the second lens 112. The first spacer 14 defines the distance between the first lens 111 and the second lens 112. The diameters of the first lens 111 and the second lens 112 are relatively large, enabling the optical lens 1 to have a relatively large light outlet aperture, so as to improve the imaging resolution of the laser light emitted through the first lens 111. Among them, the diameter of the first lens 111 is larger than that of the second lens 112, adapting to the need for imaging of the different object surface angles of the laser light with a gradually expanding angle from the light incident end to the light outlet end of the optical lens 1, as well as for the middle field of view channel and different peripheral field of view channels simultaneously.

[0067] The third lens 113 and the fourth lens 114 are arranged in the channel section 123. A second retaining ring 15 is arranged on the side of the third lens 113 close to the tapered section 122. A second spacer 16 is arranged between the third lens 113 and the fourth lens 114. A lens positioning step is arranged on the inner wall of the channel section 123 on the side of the fourth lens 114 away from the third lens 113. The second retaining ring 15 is threadedly connected to the inner wall of the channel section 123, pushes the third lens 113 towards the lens positioning step, and presses the fourth lens 114 against the lens positioning step through the second spacer 16, forming a pressing and fixing of the third lens 113 and the fourth lens 114. The second spacer 16 defines the distance between the third lens 113 and the fourth lens 114.

[0068] The diameters of the third lens 113 and the fourth lens 114 are relatively small. While ensuring the focusing and imaging of the laser from the middle field of view channel and the peripheral field of view channels, the volume and weight of the wind measurement radar antenna are reduced. The objective lens barrel 12 is threadedly connected to the channel base 2 through the channel section 123.

[0069] By setting the different shapes, different diameters of the first lens 111, the second lens 112, the third lens 113 and the fourth lens 114, and the sizes of the corresponding light-emitting port section 121, the tapered section 122 and the channel section 123 on the objective lens barrel 12, the near-ground heterogeneous angle wind field lidar antenna of the present application has a smaller volume and a smaller weight. While meeting the optical performance requirements, the miniaturization, light weight and low cost of the radar antenna are realized, so that the near-ground heterogeneous angle wind field lidar antenna of the present application can be applied to vehicles and unmanned aerial vehicles for measuring the near-ground wind field, greatly expanding the applicability of the wind measurement equipment and breaking through the technical bottleneck of the miniaturization and light weight of the lidar.

[0070] By setting the different materials, different sizes, different shapes and different spacing distances between the first lens 111, the second lens 112, the third lens 113 and the fourth lens 114, it is possible to make the size of the objective lens barrel 12 change at different temperatures, causing the spacing distance between different lenses to change. At the same time, the lens itself will also have curvature and thickness changes due to temperature changes. The changes in the lens curvature and thickness are used to reversely compensate for the size changes of the objective lens barrel 12 caused by temperature changes, so that the optical lens 1 has higher temperature stability. In this way, the objective lens barrel 12 of the present application can be made of ordinary materials such as aluminum alloy, instead of using materials with low thermal expansion coefficients such as invar, reducing the manufacturing cost of the near-ground heterogeneous angle wind field lidar antenna of the present application, better ensuring the thermal stability of the near-ground heterogeneous angle wind field lidar antenna of the present application, and enabling the near-ground heterogeneous angle wind field lidar antenna of the present application to have good optical performance at temperatures from -20°C to 60°C, meeting the need for measuring the near-ground wind field in the field working temperature environment from -20°C to 60°C.

[0071] As a specific implementation manner of the near-ground heterogeneous angle wind field lidar antenna of the present application, as Figures 3 to 5 shown, the side of the second retaining ring 15 in contact with the third lens 113 extends along the outer convex spherical surface of the third lens 113 towards the lens center direction to form a diaphragm 151. By setting the diaphragm 151, the marginal aberration of the optical system can be optimized, the light-passing aperture of the laser light can be restricted, and the interference of ambient stray light entering the optical lens 1 on the imaging system can be reduced.

[0072] The central axes of the central flange assembly 31 and the multiple peripheral flange assemblies 32 intersect at the center position of the diaphragm 151, so that the laser light introduced through the central flange assembly 31 and the laser light introduced through each peripheral flange assembly 32 both have good imaging effects.

[0073] In some embodiments of the near-surface non-uniform angle wind field laser wind measurement radar antenna of the present application, as Figure 3 shown, the flange adjustment assembly 3 includes a channel seat connecting sleeve 301, a flange connecting sleeve 302, a compression spring 303, and a focusing knob 304. The channel seat connecting sleeve 301 is set as a cylindrical tube. One end of the channel seat connecting sleeve 301 is fixedly connected to the flange seat mounting plate 21, usually by screwing into the mounting hole on the flange seat mounting plate 21 through a connecting thread.

[0074] One end of the flange connecting sleeve 302 is installed inside the channel seat connecting sleeve 301, and the other end is located outside the channel seat connecting sleeve 301. The flange connecting sleeve 302 can slide inside the channel seat connecting sleeve 301, thereby changing the distance between the outer end of the flange connecting sleeve 302 and the flange seat mounting plate 21. The compression spring 303 is arranged between the channel seat connecting sleeve 301 and the flange connecting sleeve 302, and can generate a tendency to push the flange connecting sleeve 302 to move outward from the channel seat connecting sleeve 301.

[0075] The focusing knob 304 is set as a cup-shaped structure with one end open. The open end of the focusing knob 304 is sleeved on the end of the flange connecting sleeve 302 and extends outside the channel seat connecting sleeve 301, and is threadedly connected to the channel seat connecting sleeve 301. By rotating the focusing knob 304 to move the focusing knob 304 towards the middle of the channel seat connecting sleeve 301, the bottom of the focusing knob 304 can push the flange connecting sleeve 302 to enter the channel seat connecting sleeve 301 more. The compression spring 303 can push the end of the flange connecting sleeve 302 to press against the bottom of the focusing knob 304.

[0076] A fiber optic connection flange is provided at the end of the flange connecting sleeve 302 located outside the channel seat connecting sleeve 301, and the fiber optic connection flange can be connected to the fiber optic connector 4. A flange hole is provided at the bottom of the focusing knob 304. When the focusing knob 304 is screwed onto the channel seat connecting sleeve 301, the connection interface of the fiber optic connection flange is located inside the flange hole, so that the fiber optic connector 4 can be connected to or separated from the fiber optic connection flange from the outside of the focusing knob 304.

[0077] By adjusting the focusing knobs 304 on different flange adjustment assemblies 3, the distance between the fiber optic connectors 4 connected to different flange adjustment assemblies 3 and the flange seat mounting plate 21 can be adjusted, thereby adjusting the distance between the fiber optic output surface of the fiber optic connector 4 and the objective lens group 11, realizing separate focusing on the laser light introduced into different field channels, and ensuring that the laser light in each field channel has good focusing and imaging effects.

[0078] In a preferred embodiment of the near-surface non-uniform angle wind field laser wind measurement radar antenna of the present application, as Figure 3As shown, a plurality of fixing screw holes penetrating the side wall of the channel seat connecting sleeve 301 are provided on the outer peripheral surface of the channel seat connecting sleeve 301, and fastening screws 306 are screwed into the fixing screw holes. By rotating the fastening screws 306 into the interior of the fixing screw holes, the end of the fastening screw 306 can be made to abut against the flange connecting sleeve 302, fixing the flange connecting sleeve 302 at the current position in the channel seat connecting sleeve 301 and ensuring the stability of the position of the flange connecting sleeve 302 in the channel seat connecting sleeve 301.

[0079] An axially extending relief groove 305 is further provided on the outer peripheral surface of the channel seat connecting sleeve 301. A fiber optic fixing threaded hole is provided at a position on the flange connecting sleeve 302 opposite to the relief groove 305. A fiber optic fixing screw 307 is screwed into the fiber optic fixing threaded hole, and a fiber optic protection pad is provided at the end of the fiber optic fixing screw 307. By rotating the fiber optic fixing screw 307 into the interior of the flange connecting sleeve 302, the end of the fiber optic fixing screw 307 can be made to abut against the fiber optic for introducing the laser beam of the fiber optic connector 4, pressing the fiber optic against the inner wall of the flange connecting sleeve 302 and fixing the position of the light-emitting surface of the fiber optic within the flange connecting sleeve 302. The fiber optic protection pad can prevent the end of the fiber optic fixing screw 307 from damaging the fiber optic, and the relief groove 305 can avoid interference between the wall of the channel seat connecting sleeve 301 and the fiber optic fixing screw 307, ensuring the sliding of the flange connecting sleeve 302 within the channel seat connecting sleeve 301.

[0080] After adjusting the flange adjusting assembly 3 so that the laser light of the corresponding field-of-view channel forms a good imaging effect, rotate the fastening screw 306 to fix the flange connecting sleeve 302 in the channel seat connecting sleeve 301, and rotate the fiber optic fixing screw 307 to fix the fiber optic in the flange connecting sleeve 302, which can ensure that the laser light is always in a good imaging state and ensure the stability of the laser wind measurement effect.

[0081] An optical performance simulation is carried out on the near-ground multi-angle wind field laser wind measurement radar antenna of a preferred embodiment of the present application using optical design software (hereinafter referred to as simulation example 1). The parameters of each lens in the objective lens group 11 of simulation example 1 are shown in Table 1: Table 1: Parameters of each lens in simulation example 1 (data unit: mm) Lens Material Front Curvature Radius Rear Curvature Radius Thickness Diameter First Lens H-LAK59A 110.977 438.653 8 30 Second Lens H-ZF7LA 54.23 105.682 8 27 Third Lens H-ZLAF53B 548.934 37.124 5.5 15 Fourth Lens H-ZPK1A 70.616 -172.554 6 16.5 The other main parameters of the optical system in simulation example 1 are shown in Table 2: Table 2: Other parameters of the optical system in simulation example 1 The objective lens barrel 12 and the objective lens retaining ring 13, the first spacer ring 14, the second retaining ring 15 and the second spacer ring 16 inside it, and the TCE×1E-6 (thermal expansion coefficient) of the flange adjustment assembly 3 is set to 23.2 (corresponding to aluminum alloy material), and the TCE×1E-6 of the channel seat 2 is set to 16 (corresponding to austenitic stainless steel material); the object plane angle of the laser in the peripheral field of view channel is designed to be 9°. The optical path diagrams of the central field of view channel and a peripheral field of view channel obtained by simulation are respectively as Figure 6 and Figure 7 shown. It can be seen from the figure that the length of the objective lens group 11 in this simulation example is 70 mm, the total axial length of the optical system is about 140 mm, the light exit aperture is 30 mm, and the laser light rays of the central field of view channel and the peripheral field of view channel can all pass through the objective lens group 11 for imaging well. As Figure 8 and Figure 9 shown, the peak-to-valley difference and RMS (root mean square value) of the laser wavefront function of the central field of view channel and the peripheral field of view channel in this embodiment are both much smaller than the requirements of the Rayleigh criterion; as Figure 10 and Figure 11 shown, the RMS radius of the laser image point spot diagram of the central field of view channel and the peripheral field of view channel in this embodiment is much smaller than the Airy radius, proving that both the central field of view channel and the peripheral field of view channel with a 9° object plane angle in this embodiment have good optical performance.

[0082] The optical system in Simulation Example 1 is simulated under different temperature environments. The changes in the structure of the optical system under different temperature environments are shown in Table 3: Table 3: Changes in the structure of the optical system in Simulation Example 1 under different temperature environments The changes in some optical performance indicators of the optical system under different temperature environments are shown in Table 4: Table 4: Changes in the optical performance indicators of the peripheral field of view channel in Simulation Example 1 under different temperature environments Index Name 20℃ -20℃ 0℃ 60℃ Peak-to-Valley of Wavefront Function (waves) 0.0502 0.0594 0.0406 0.0751 RMS of Wavefront Function (waves) 0.0115 0.0110 0.0099 0.0195 Airy Radius of Image Spot Diagram (μm) 6.555 6.547 6.551 6.564 RMS Radius of Image Spot Diagram (μm) 1.553 1.778 1.65 1.473 As can be seen from Table 3, under different temperature environments, the surface curvature, thickness, and diameter of each lens will change due to thermal expansion. At the same time, the distance between each lens and the distance between the lens and the light-emitting surface of the laser fiber will also change. In this application, through targeted optimization design, the changes in lens curvature and thickness can be used to reversely compensate for the dimensional changes of the objective lens barrel 12 caused by temperature changes. The performance indicators of the optical system after compensation are shown in Table 4. As can be seen from Table 4, in the optical system of the near-ground multi-angle wind field laser anemometer radar antenna of this application, the optical performance indicators of the peripheral field of view channels that are easily affected by the temperature environment remain highly stable at temperatures from -20°C to 60°C, and all maintain good optical performance, which can ensure that the near-ground multi-angle wind field laser anemometer radar antenna of this application can stably detect the near-ground wind field at different object surface viewing angles in the temperature environment from -20°C to 60°C, meeting the requirements for near-ground wind field detection in different geographical environments.

[0083] Then, use optical design software to simulate a preferred embodiment of the near-ground multi-angle wind field laser anemometer radar antenna with a 10° object surface angle in a peripheral field of view channel of this application (hereinafter referred to as Simulation Example 2). The parameters of each lens in the objective lens group 11 of Simulation Example 2 are shown in Table 5: Table 5: Parameters of each lens in Simulation Example 2 (data unit: mm) The other main parameters of the optical system in Simulation Example 2 are shown in Table 6: Table 4: Other parameters of the optical system in Simulation Example 2 Front Surface Rear Surface Spacer Distance (mm) Object Surface Front Reference Surface 5.000E+04 Front Reference Surface Front Surface of the First Lens 10.000 Rear Surface of the First Lens Front Surface of the Second Lens 0.200 Rear Surface of the Second Lens Diaphragm 28.870 Diaphragm Front Surface of the Third Lens 0.010 Rear Surface of the Third Lens Front Surface of the Fourth Lens 7.920 Rear Surface of the Fourth Lens Optical Fiber Output Surface 73.063 The TCE×1E-6 (thermal expansion coefficient) of the objective lens barrel 12 and the objective lens retaining ring 13, the first spacer 14, the second retaining ring 15, and the second spacer 16 inside it, as well as the channel base 2 and the flange adjustment assembly 3, are all set to 23.2 (corresponding to aluminum alloy material). The object surface angle of the laser in the peripheral field of view channel is designed to be 10°. The optical path diagrams of the middle field of view channel and a peripheral field of view channel obtained by simulation are respectively as Figure 12 and Figure 13 shown. As can be seen from the figure, the length of the objective lens group 11 in this embodiment is 70 mm, the total axial length of the optical system is about 149 mm, the light-emitting aperture is 32 mm, and the laser light rays of the middle field of view channel and the peripheral field of view channel can all pass through the objective lens group 11 for imaging well. As Figure 14 and Figure 15 shown, the peak-valley value and RMS (root mean square value) of the laser wavefront function of the middle field of view channel and the peripheral field of view channel in this embodiment are both much smaller than the requirements of the Rayleigh criterion; as Figure 10 and Figure 11As shown, the RMS radius of the laser image point array diagram of the central field of view channel and the peripheral field of view channel in this embodiment is much smaller than the Airy radius, which proves that both the central field of view channel and the peripheral field of view channel with a 10° object surface viewing angle in this embodiment have good optical performance.

[0084] The laser wind lidar of the present application also has the above advantages because it uses the near-surface heter-angle wind field laser wind lidar antenna of any embodiment of the present application.

[0085] In the description of the present invention, the description referring to terms such as "one embodiment", "specific embodiment", "preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0086] The above are all the preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A near-ground different-angle wind field laser wind measurement radar antenna, characterized in that: It comprises an optical lens (1), a channel seat (2), a flange adjustment component (3) and an optical fiber connector (4); The optical lens (1) is provided with an objective lens group (11) composed of a plurality of lenses; one end of the channel seat (2) is connected to the optical lens (1), and the other end is provided with a flange seat mounting plate (21); the flange adjustment component (3) comprises a middle flange component (31) and a plurality of peripheral flange components (32); the middle flange component (31) is provided in the middle of the flange seat mounting plate (21); the end of the middle flange component (31) is provided with the optical fiber connector (4) to form a middle field of view channel; the plurality of peripheral flange components (32) are dispersedly provided at different positions below the flange seat mounting plate (21); the end of each peripheral flange component (32) is provided with the optical fiber connector (4) to form a plurality of peripheral field of view channels.

2. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 1 is characterized in that: The middle flange assembly (31) and the optical fiber connector (4) at its end are both arranged on the optical axis of the objective lens assembly (11).

3. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 2 is characterized in that: The peripheral flange assembly (32) comprises a first side flange assembly (321), a second side flange assembly (322) and a bottom flange assembly (323); the first side flange assembly (321) and the second side flange assembly (322) are respectively arranged on both sides of the middle flange assembly (31) in a horizontal direction; the bottom flange assembly (323) is arranged directly below the middle flange assembly (31); and the first side flange assembly (321), the second side flange assembly (322) and the bottom flange assembly (323) have equal included angles with the middle flange assembly (31).

4. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 3 is characterized in that: The object plane angle of the peripheral field of view channel formed by the first side flange assembly (321), the second side flange assembly (322) and the bottom flange assembly (323) is 0-15°.

5. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 1 is characterized in that: The objective lens group (11) comprises a first lens (111), a second lens (112), a third lens (113) and a fourth lens (114) which are arranged in sequence from the direction of the light outlet to the direction of the channel seat (2); the first lens (111) and the second lens (112) are both half-moon convex lenses, the third lens (113) is a half-moon concave lens, the fourth lens (114) is a double convex lens, the convex surface of the second lens (112) is arranged adjacent to the concave surface of the first lens (111), and the convex surface of the third lens (113) faces the second lens (112).

6. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 5 is characterized in that: The optical lens (1) further comprises an objective lens barrel (12), the objective lens barrel (12) comprising a light outlet section (121), a tapered section (122) and a channel section (123), the first lens (111) being arranged in the light outlet section (121), an objective lens pressing ring (13) being arranged on the light outlet side of the first lens (111), the second lens (112) being arranged in a connection area between the tapered section (122) and the light outlet section (121), the first lens (111) A first spacer ring (14) is arranged between the first lens (11) and the second lens (112), the third lens (113) and the fourth lens (114) are arranged in the channel section (123), a second pressing ring (15) is arranged on the side of the third lens (113) adjacent to the conical section (122), a second spacer ring (16) is arranged between the third lens (113) and the fourth lens (114), and the channel section (123) is threadedly connected to the channel seat (2).

7. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 6 is characterized by: The second pressure ring (15) extends from a side adjacent to the third lens (113) toward the center of the third lens (113) to form an aperture (151), and the central axes of the central flange assembly (31) and the peripheral flange assembly (32) intersect at the center of the aperture (151).

8. The near-ground different-angle wind field laser wind measurement radar antenna according to any one of claims 1 to 7, characterized in that: The flange adjustment assembly (3) comprises a channel seat connection sleeve (301), a flange connection sleeve (302), a compression spring (303) and a focusing knob (304); the channel seat connection sleeve (301) is fixed on the flange seat mounting plate (21); one end of the flange connection sleeve (302) is slidably arranged in the channel seat connection sleeve (301), and the other end is provided with an optical fiber connection flange; the compression spring (303) is arranged between the channel seat connection sleeve (301) and the flange connection sleeve (302); the focusing knob (304) is sleeved on the end of the flange connection sleeve (302) and is threadedly connected to the channel seat connection sleeve (301); and a flange hole is provided at the end of the focusing knob (304), so that the optical fiber connection flange is located in the flange hole.

9. The near-ground different-angle wind field laser wind measurement radar antenna according to claim 8, characterized in that: An axially extending avoidance groove (305) and a plurality of fixing screw holes are provided on the outer peripheral surface of the channel seat connection sleeve (301), a fastening screw (306) is threadedly connected to the fixing screw hole, an optical fiber fixing screw (307) is threadedly connected to the flange connection sleeve (302), the optical fiber fixing screw (307) is arranged corresponding to the avoidance groove (305), and an optical fiber protection pad is provided at the end of the optical fiber fixing screw (307).

10. A laser wind radar, characterized in that: It comprises a near-ground different-angle wind field laser wind measurement radar antenna according to any one of claims 1-9.

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