Optical axis monitoring and adaptive correction device for coherent wind lidar

Abstract

The application discloses a kind of coherent wind measurement laser radar optical axis monitoring and self-adaptive correction device, by introducing additional monitoring light and detection light common optical path, not only can utilize all echo signals, improve system detection efficiency, and can simultaneously monitor the deviation existing between emission optical axis and receiving optical axis, by separating, adjusting the polarization state of monitoring light, respectively construct emission optical axis and receiving optical axis, utilize area array camera real-time imaging emission spot and receiving spot, real-time monitoring, monitoring result is fed back to beam adjustment mirror controller, to realize the function of real-time correction optical axis, increase system coupling efficiency.

Description

Technical Field

[0001] This invention belongs to the field of lidar, specifically relating to a coherent wind-measuring lidar optical axis monitoring and adaptive correction device. Background Technology

[0002] Atmospheric wind fields play a crucial role in military defense, meteorological forecasting and research, and wind power generation. Since the 1960s, foreign scholars have been researching coherent detection laser Doppler wind radar. Although China's development started relatively late, ground-based, shipborne, vehicle-mounted, and airborne coherent detection laser Doppler wind radars have achieved relatively mature development. With the rapid development of China's aerospace industry in the new era, future spaceborne coherent detection laser Doppler wind radars are currently in the pre-research stage. The rapid development of the aerospace industry places increasingly higher demands on radar systems. For radar systems based on a coaxial design, maintaining high coaxiality between the transmitting and receiving optical axes is a crucial prerequisite for achieving high-precision and high-efficiency detection. However, during system operation, complex external environments, system vibrations, mechanical shocks, and gravitational release can cause deviations in the transmitting and receiving optical axes, thus reducing the system's detection capability, especially noticeable in spaceborne radars. Specifically, the divergence angle of a laser is typically in the range of hundreds of microradians. Changes in the optical axis reaching tens of microradians will lead to the loss of the echo signal or even make the echo signal undetectable. Therefore, real-time monitoring of the optical axis and adaptive correction are crucial and essential.

[0003] To monitor whether the relative positions of the transmitting and receiving optical axes coincide, the alignment is typically determined by the relative positions of their images on the camera. Patent 201921931090.0 proposes an optical alignment device for monitoring the optical axis of a polarization-splitting reflective telescope. The drawback of this approach is the use of an auxiliary large-aperture plane mirror. Firstly, large-aperture plane mirrors are difficult to manufacture, require high surface precision, and are costly. Secondly, this approach necessitates a manual adjustment mechanism to ensure the centroids of the transmitting and receiving light spots are aligned, and the adjustment range is typically on the order of microradians, which is extremely difficult in practice. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a coherent wind-measuring lidar optical axis monitoring and adaptive correction device. This device eliminates the need for an auxiliary large-aperture plane mirror, introduces additional monitoring light and probe light sharing a common optical path, effectively utilizes all echo signals, improves system detection efficiency, and can simultaneously monitor the deviation between the transmitted and received optical axes. By separating and adjusting the polarization state of the monitoring light, the transmitted and received optical axes are constructed separately. A planar array camera is used to image the transmitted and received light spots in real time, enabling real-time monitoring. The monitoring results are fed back to the beam adjustment mirror controller, solving the problems of optical axis monitoring and adaptive correction and increasing system coupling efficiency.

[0005] This invention utilizes a transmission film coated with the wavelength of the detection light source and a reflection film coated with the monitoring light source to monitor the optical axis without losing the echo signal. A polarizing beam splitter and a quarter-wave plate are used to split the monitoring laser into two beams: linearly polarized S-beams and linearly polarized P-beams, which are then used to construct the emission and reception optical axes, respectively. Specifically, the laser emitted from the monitoring light source is incident on the 45° splitting surface of the polarizing beam splitter. The linearly polarized S-beams exit at a 90° angle to the original optical axis. This portion of the light passes through a quarter-wave plate and a total reflection mirror, changing its beam direction by 180° before passing through another quarter-wave plate and finally becoming linearly polarized P-beams. After passing through a series of optical systems, it is imaged on a camera, thus establishing the radar emission optical axis. The linearly polarized P-beams pass through the polarizing beam splitter without changing their beam direction. This portion of the light becomes circularly polarized after passing through a quarter-wave plate and is then reflected by a telescope. Due to the weak backscattered signal intensity, it cannot be imaged on the camera. Therefore, a small-aperture plane mirror for the radar receiving optical axis is introduced into the radar system and vertically mounted on the secondary mirror support structure of the radar receiving telescope. The deflection direction of the plane mirror represents the change in the radar receiving optical axis. After the monitoring light is incident on the plane mirror, it is reflected back along the original path and passes through a quarter-wave plate again, eventually becoming linearly polarized S-light. After passing through a series of optical systems, it is finally imaged on the camera, thus establishing the radar receiving optical axis.

[0006] By performing image processing to calculate the relative positions of the emitted and received light spots on the camera, the deviation between the emitted and received optical axes is calculated in real time. Then, the beam adjustment mirror controller adjusts the angle of the beam adjustment mirror based on the calculated deviation, ensuring that the deviation between the emitted and received optical axes is zero, thus guaranteeing maximum coupling efficiency.

[0007] The technical solution of the present invention is as follows:

[0008] A coherent wind-measuring lidar optical axis monitoring and adaptive correction device, characterized in that it includes:

[0009] The light source module is used to actively emit laser light of a suitable wavelength;

[0010] Transmission and reflection modules are used to transmit probe light and reflect monitoring light.

[0011] The reflection module is used to reflect the wavelength of the monitoring light.

[0012] A filter module is used to absorb the wavelength of the probe light while transmitting the wavelength of the monitoring light;

[0013] The polarization beam splitter module is used to split the laser into two beams, namely linearly polarized S-beam and linearly polarized P-beam;

[0014] The polarization conversion module is used to change the polarization direction of a light beam by 90° after the beam passes through the module twice.

[0015] The collimation module is used to compress the divergence angle of the probe light and the monitoring light, so that the emitted light is parallel light;

[0016] The telescope module is used to further compress the divergence angle of the probe light and transmit it into the atmosphere and receive atmospheric echo signals.

[0017] The fiber optic module is used to couple the echo signal of the probe light.

[0018] Furthermore, it also includes:

[0019] The beam adjustment module is used to adjust the deviation between the transmitting and receiving optical axes in real time.

[0020] Or, it may also include:

[0021] The focusing and photoelectric detection module is used to focus the emitted and received light spots and transmit them to the photoelectric detection module for imaging. After data acquisition and processing, it generates the input signal for the beam adjustment mirror controller.

[0022] Preferably, the polarization beam splitter module is a polarization beam splitter prism.

[0023] Preferably, the reflection module is a high-reflectivity mirror with a reflectivity of at least 99%.

[0024] Preferably, the transmissive and reflective module is a plane mirror with a transmittance of at least 99% and a reflectance of at least 1%.

[0025] Compared with existing technologies, the beneficial effects of the invention are as follows:

[0026] (1) By introducing additional monitoring light and detection light to share the same optical path, not only can all echo signals be utilized to improve the system detection efficiency, but also the deviation between the transmitting optical axis and the receiving optical axis can be monitored at the same time.

[0027] (2) By separating and adjusting the polarization state of the monitoring light, the emission optical axis and the receiving optical axis are constructed respectively. The emission spot and the receiving spot are imaged in real time by the area array camera, and the monitoring is carried out in real time. The monitoring results are fed back to the beam adjustment mirror controller, thereby realizing the function of real-time correction of the optical axis and increasing the system coupling efficiency.

[0028] (3) The device has a simple structure, low cost, and is easy to operate. It is suitable for various platforms such as ground-based, ship-based, vehicle-based, airborne, and space-based. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of Embodiment 1 of the coherent wind-measuring lidar optical axis monitoring and adaptive correction device of the present invention.

[0030] In the diagram: 1. Detection light source, 2. Monitoring light source, 3a. First plane mirror, 3b. Second plane mirror, 3c. Third plane mirror, 4. Collimating lens, 5a. First quarter-wave plate, 5b. Second quarter-wave plate, 5c. Third quarter-wave plate, 6. Polarizing beam splitter, 7. Filter, 8. High-reflection mirror, 9. Beam adjustment mirror, 10a. First focusing lens, 10b. Second focusing lens, 11. Area array camera, 12. Computer, 13. Beam adjustment mirror controller, 14. Telescope primary mirror, 15. Telescope secondary mirror, 16. Single-mode fiber. Detailed Implementation

[0031] The present invention will be further described below with reference to examples and accompanying drawings, but this should not be construed as limiting the scope of protection of the present invention.

[0032] Example 1

[0033] See Figure 1 , Figure 1 This is a schematic diagram of Embodiment 1 of the coherent wind-measuring lidar optical axis monitoring and adaptive correction device of the present invention. As shown in the figure, a coherent wind-measuring lidar optical axis monitoring and adaptive correction device includes a detection light source 1, a monitoring light source 2, a first plane mirror 3a, a second plane mirror 3b, a third plane mirror 3c, a collimating lens 4, a first quarter-wave plate 5a, a second quarter-wave plate 5b, a third quarter-wave plate 5c, a polarizing beam splitter prism 6, a filter 7, a high-reflection mirror 8, a beam adjustment mirror 9, a first focusing lens 10a, a second focusing lens 10b, an area array camera 11, a computer 12, a beam adjustment mirror controller 13, a telescope primary mirror 14, a telescope secondary mirror 15, and a single-mode optical fiber 16.

[0034] The detection light source 1 emits laser light, which passes through the first plane mirror 3a (coated with a transmission film for the detection light source wavelength and a reflection film for the monitoring light source), collimating lens 4, and first quarter-wave plate 5a before reaching the polarizing beam splitter 6. Rotating the first quarter-wave plate 5a splits the detection light source 1 into a very small portion of linearly polarized S-light and a large portion of linearly polarized P-light. The small portion of the linearly polarized S-light is emitted at a 90° angle to the original optical axis and is absorbed after passing through the filter 7 of that wavelength; while the large portion of the linearly polarized P-light passes along the original optical axis and becomes circularly polarized after passing through the third quarter-wave plate 5c. Then, after being reflected by the secondary mirror 15 and the primary mirror 14 of the telescope, it passes through the third plane mirror 3c (coated with a transmission film for the detection light source wavelength and a reflection film for the monitoring light source) before entering the atmosphere. The atmospheric echo signal returns along the original path, passes through the third quarter-wave plate 5c again to become linearly polarized S-light, and is completely reflected after being incident on the 45° beam-splitting surface of the polarizing beam-splitting prism and entering the receiving optical path. It is then reflected by the beam adjustment mirror 9 and transmitted through the second plane mirror 3b (coated with a transmission film for detecting the wavelength of the light source and a reflection film for monitoring the light source), and then enters the single-mode fiber 16 through the second focusing lens 10b, thus obtaining the echo signal.

[0035] The monitoring light source 2 emits a laser beam that is incident on the first plane mirror 3a. The beam propagation direction forms a 45° angle with the normal of the first plane mirror 3a, and its incident position coincides with the incident position of the detection light source 1 on the first plane mirror 3a. After being reflected by the first plane mirror 3a, the monitoring light and the detection light share the same optical path, so the optical axis of the monitoring light can characterize the optical axis of the detection light. Then, the monitoring light passes through the collimating lens 4 to emit parallel light, and after passing through the first quarter-wave plate 5a, it reaches the polarizing beam splitter prism 6, where the monitoring light is split into two beams: linearly polarized S-beams and linearly polarized P-beams. One of the linearly polarized S-beams exits at a 90° angle to the original optical axis. After passing through the filter 7 and the second quarter-wave plate 5b, it becomes circularly polarized light. Then, after being reflected by the high-reflection mirror 8, the beam direction changes by 180°. After passing through the second quarter-wave plate 5b again, it becomes linearly polarized P-beam. After being transmitted through the polarizing beam splitter 6, it reaches the beam adjustment mirror 9 and is reflected onto the surface of the second plane mirror 4b. Then, it is completely reflected and converged by the first focusing lens 10a, finally forming an image on the area array camera 11, i.e., the imaging spot on the emission optical axis. Another linearly polarized P-beam is transmitted through the polarizing beam splitter 6, becomes circularly polarized after passing through the third quarter-wave plate 5c, and then is reflected sequentially by the secondary mirror 15 and the primary mirror 14 of the telescope before reaching the third plane mirror 4c. The reflected light returns along the same path, passes through the third quarter-wave plate 5c again, and becomes linearly polarized S-beam. It is incident on the 45° beam splitting surface of the polarizing beam splitter and is completely reflected into the receiving optical path. After passing sequentially through the beam adjustment mirror 9, the second plane mirror 4b, and the first focusing lens 10a, it is finally imaged on the area array camera 11, i.e., the imaging spot of the receiving optical axis. Without losing the echo signal, the computer 12 performs real-time data processing on the imaging spots of the transmitting and receiving optical axes on the area array camera 11 to calculate their relative positions. The calculation results are used to obtain the input signal of the beam adjustment mirror controller 13, thereby further adjusting the deflection angle of the beam adjustment mirror 9 so that the centroids of the two spots coincide. This indicates that the transmitting and receiving axes are coaxial, i.e., the coupling efficiency is maximized.

[0036] The following are the parameters of the main components used in one embodiment, and are suitable for, but not limited to, the following parameters:

[0037] The detection light source 1 uses a single-mode laser with a wavelength of 2051nm and an output energy of 100mJ.

[0038] The monitoring light source 2 uses a single-mode laser with a wavelength of 1064nm and an output power of 50mW.

[0039] The first, second, and third plane mirrors 3a, 3b, and 3c are coated with a 99% transmission film of 2051 nm and a 1% reflection film of 1064 nm.

[0040] The collimating lens 4 is a plano-convex lens of model LA6002 from Thorlabs, with a working wavelength of 200-6000nm, a focal length of 50mm, a light transmission diameter of 25.4mm, and a material of magnesium fluoride.

[0041] The first, second, and third quarter-wave plates 5a, 5b, and 5c are composed of quartz half-wave plates and are capable of producing an optical path difference of λ / 4.

[0042] The polarizing beam splitter 6 can have a side length of 25mm and is composed of two fused silica prisms, suitable for 1064nm and 2051nm.

[0043] The filter 7 is a Thorlabs FLH1064-3 hard film bandpass filter with a wavelength range of 1000-1250nm, a center wavelength of 1064nm, a transmittance of more than 90%, and a light-passing aperture of 21mm.

[0044] The high-reflectivity mirror 8 is coated with a dielectric film, and has an average reflectivity of more than 99% for a wavelength of 1064nm.

[0045] The beam adjustment mirror 9 is coated with a dielectric film, and its average reflectivity for wavelengths of 1064nm and 2051nm is greater than 99%.

[0046] The first focusing lens 10a is a plano-convex lens of Thorlabs, model LA1074-YAG, coated with a 1064nm anti-reflection film, with a focal length of 20mm, a light transmission aperture of 25mm, and made of N-BK7 material.

[0047] The second focusing lens 10b is a plano-convex lens of Thorlabs, model LA8126-E, coated with a 2-5μm anti-reflection film, with a focal length of 20mm, a light transmission aperture of 12.7mm, and made of silicon.

[0048] The area array camera 11 uses a Spiricon SP620 beam analyzer from the United States, with a working wavelength of 190nm-1100nm, a pixel size of 4.4um*4.4um, and a pixel count of 1600*1200.

[0049] The computer 12 can be any desktop or laptop computer that can be connected to an area scan camera.

[0050] The beam adjustment mirror controller 13 can control the deflection angle of the beam adjustment mirror.

[0051] The system consisting of the primary mirror 14 and the secondary mirror 15 of the telescope has a magnification of 30, an effective aperture of 400mm, and a surface accuracy better than 1 / 10λ@2051nm.

[0052] The single-mode fiber 16 is a PM1950 single-mode fiber from Coherent, Inc., with a working wavelength of 1850-2200nm, a numerical aperture of 0.2, and a core diameter of 7μm.

[0053] The specific process of using the aforementioned coherent wind-measuring lidar optical axis monitoring and adaptive correction device for detection is as follows:

[0054] The probe light source 1 emits a 2051nm laser beam, which passes sequentially through the first plane mirror 3a, the collimating lens 4, and the first quarter-wave plate 5a. Slightly rotating the first quarter-wave plate 5a causes the polarizing beam splitter 6 to split the probe light source 1 into a very small portion of linearly polarized S-beams and a large portion of linearly polarized P-beams. The linearly polarized S-beams exit at a 90° angle to the original optical axis and are absorbed by the filter 7. The linearly polarized P-beams, along the original optical axis, pass through the third quarter-wave plate 5c and become circularly polarized. They are then reflected sequentially by the secondary mirror 15 and the primary mirror 14 of the telescope, and finally pass through the third plane mirror 3c before entering the atmosphere. The atmospheric backscattered signal is received by the telescope, passes again through the third quarter-wave plate 5c to become linearly polarized S-beams, and is then completely reflected by the polarizing beam splitter prism into the receiving optical path. After being reflected sequentially by the beam adjustment mirror 9 and transmitted through the second plane mirror 3b, it is finally focused by the second focusing lens 10b and coupled into the single-mode fiber 16.

[0055] The monitoring light source 2 emits a 1064nm laser beam, which is incident on the first plane mirror 3a. The angle between its incident direction and the normal of the first plane mirror 3a is 45°. The incident position coincides with the incident position of the detection light source 1 on the first plane mirror 3a. After reflection by the first plane mirror 3a, the monitoring light shares the same optical path as the detection light, thus the optical axis of the monitoring light can characterize the optical axis of the detection light. The monitoring light then passes through the collimating lens 4 to emit parallel light, and then passes through the first quarter-wave plate 5a before reaching the polarizing beam splitter 6. The polarizing beam splitter 6 splits the monitoring light into two beams: linearly polarized S-beams and linearly polarized P-beams. One of the linearly polarized S-beams exits at a 90° angle to the original optical axis. After passing through the filter 7 and the second quarter-wave plate 5b, it becomes circularly polarized light. Then, it is reflected by the high-reflectivity mirror 8 coated with a dielectric film, changing the beam direction by 180°. It then passes through the second quarter-wave plate 5b again, becoming linearly polarized P-beam. After passing through the polarizing beam splitter 6, it reaches the beam adjustment mirror 9 and is reflected onto the surface of the second plane mirror 4b. Finally, the linearly polarized P-beam is completely reflected and converged by the first focusing lens 10a, forming an image on the area array camera 11. This is the imaging spot of the emitted optical axis. Another linearly polarized P-beam is transmitted through the polarizing beam splitter 6, becomes circularly polarized after passing through the third quarter-wave plate 5c, and then is reflected by the secondary mirror 15 and the primary mirror 14 of the telescope. It is then reflected by the third plane mirror 4c, which is coated with a 1064nm reflective film. After the light path is reversed by 180°, it passes through the telescope again, and then passes through the third quarter-wave plate 5c again to become linearly polarized S-beam. It is incident on the 45° beam splitter surface of the polarizing beam splitter and is completely reflected into the receiving light path. After passing through the beam adjustment mirror 9, the second plane mirror 4b and the first focusing lens 10a, it is finally imaged on the area array camera 11. This is the imaging spot of the receiving optical axis.

[0056] Without losing the echo signal, the computer 12 can calculate the angle between the transmitting and receiving optical axes in real time based on the relative positions of the transmitting and receiving optical axes on the imaging spot of the area array camera 11. The calculation result is input into the beam adjustment mirror controller 13 as a feedback signal, so that the deflection angle of the beam adjustment mirror 9 can be adjusted in real time to ensure that the transmitting and receiving optical axes coincide, and the system coupling efficiency is maximized at this time.

Claims

1. A coherent wind-measuring lidar optical axis monitoring and adaptive correction device, characterized in that, include: The light source module is used to actively emit laser light of a suitable wavelength, including a detection light source (1) and a monitoring light source (2); Transmission and reflection modules are used to transmit probe light and reflect monitoring light. The reflection module is used to reflect the wavelength of the monitoring light. A filter module is used to absorb the wavelength of the probe light while transmitting the wavelength of the monitoring light; The polarization beam splitter module is used to split the laser into two beams, namely linearly polarized S-beam and linearly polarized P-beam; The polarization conversion module is used to change the polarization direction of a light beam by 90° after the beam passes through the module twice. The collimation module is used to compress the divergence angle of the probe light and the monitoring light, so that the emitted light is parallel light; The telescope module is used to further compress the divergence angle of the probe light and transmit it into the atmosphere and receive atmospheric echo signals. The beam adjustment module is used to adjust the deviation between the transmitting and receiving optical axes in real time. The focusing and photoelectric detection module is used to focus and image the transmitting and receiving optical axes, and to generate the input signal for the beam adjustment mirror controller after data acquisition and processing. Fiber optic module, used to couple the echo signal of the probe light; The transmission and reflection module includes a first plane mirror (3a) with a transmittance of 99% and a reflectance of 1%, a second plane mirror (3b) and a third plane mirror (3c). The filtering module is a filter (7). The polarization beam splitting module is a polarization beam splitter (6). The polarization conversion module includes a first quarter-wave plate (5a), a second quarter-wave plate (5b) and a third quarter-wave plate (5c). The collimation module is a collimating lens (4). The focusing and photoelectric module includes a first focusing lens (10a), a second focusing lens (10b) and an area array camera (11). The telescope module includes a telescope primary mirror (14) and a telescope secondary mirror (15). The beam adjustment module includes a beam adjustment mirror (9) and a beam adjustment mirror controller (13). The fiber optic module is a single-mode fiber (16). The laser emitted by the detection light source (1) passes sequentially through the first plane mirror (3a), the collimating lens (4), and the first quarter-wave plate (5a), causing the detection light source (1) to be split into a very small portion of linearly polarized S-light and a large portion of linearly polarized P-light. The small portion of the linearly polarized S-light is reflected by the polarizing beam splitter (6) and exits at a 90° angle to the original optical axis, where it is absorbed by the filter (7) of that wavelength. The large portion of the linearly polarized P-light passes sequentially along the original optical axis through the polarizing beam splitter (6) and the third quarter-wave plate (5a). After being converted into circularly polarized light, it is reflected by the secondary mirror (15) and primary mirror (14) of the telescope in sequence, and then enters the atmosphere through the third plane mirror (3c). The atmospheric echo signal returns along the original path, and is converted into linearly polarized S-light by the third quarter-wave plate (5c). After being incident on the 45° beam splitting surface of the polarizing beam splitter, it is completely reflected into the receiving optical path. After being reflected by the beam adjustment mirror (9) and transmitted by the second plane mirror (3b) in sequence, it enters the single-mode fiber (16) through the second focusing lens (10b), thereby obtaining the echo signal. The monitoring light source (2) emits a laser beam that is incident on the first plane mirror (3a). The beam propagation direction is at a 45° angle to the normal of the first plane mirror (3a), and its incident position coincides with the incident position of the detection light source (1) on the first plane mirror (3a). The monitoring light and the detection light share the same optical path after being reflected by the first plane mirror (3a), so the optical axis of the monitoring light characterizes the optical axis of the detection light. Then, the monitoring light passes through the collimating lens (4) to emit parallel light, and after passing through the first quarter-wave plate (5a), it reaches the polarization beam splitter (6). The monitoring light is split into linearly polarized S light and linearly polarized P light. Two beams of light, one of which is linearly polarized S-beam, is reflected by the polarizing beam splitter (6) and exits at a 90° angle to the original optical axis. After passing through the filter (7) and the second quarter-wave plate (5b), it becomes circularly polarized light. Then, after being reflected by the high-reflection mirror (8), the beam direction changes by 180°. After passing through the second quarter-wave plate (5b) again, it becomes linearly polarized P-beam. After being transmitted through the polarizing beam splitter (6), it reaches the beam adjustment mirror (9) and is reflected onto the surface of the second plane mirror (3b). Then, it is completely reflected and converged by the first focusing lens (10a) to finally form an image on the area array camera. 11) The imaging spot is on the emitting optical axis; another linearly polarized P-beam is transmitted through the polarizing beam splitter (6), becomes circularly polarized after passing through the third quarter-wave plate (5c), and then is reflected by the secondary mirror (15) and primary mirror (14) of the telescope before reaching the third plane mirror (4c). The reflected light returns along the original path, passes through the third quarter-wave plate (5c) again and becomes linearly polarized S-beam. It is incident on the 45° beam splitting surface of the polarizing beam splitter and is completely reflected into the receiving optical path. After passing through the beam adjustment mirror (9), the second plane mirror (3b) and the first focusing lens (10a) in sequence, it finally... The image is formed on the area array camera (11), that is, the imaging spot of the receiving optical axis; without losing the echo signal, the computer (12) performs real-time data processing on the imaging spots of the transmitting optical axis and the receiving optical axis on the area array camera (11) to calculate the relative position of the two; the input signal of the beam adjustment mirror controller (13) is obtained through the calculation result, thereby further adjusting the deflection angle of the beam adjustment mirror (9) so that the centroids of the two spots coincide, which means that the emitting and receiving axes are coaxial, that is, the coupling efficiency is the maximum. The reflection module is a high reflective mirror (8) with a reflectivity of 99%.

2. The coherent wind-measuring lidar optical axis monitoring and adaptive correction device according to claim 1, characterized in that, The first plane mirror (3a) is coated with a transmission film for detecting the wavelength of the light source and a reflection film for monitoring the light source; the second plane mirror (3b) is coated with a transmission film for detecting the wavelength of the light source and a reflection film for monitoring the light source; and the third plane mirror (3c) is coated with a transmission film for detecting the wavelength of the light source and a reflection film for monitoring the light source.

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