Laser continuous zoom system and its installation and adjustment method

Abstract

The present invention relates to a laser continuous zoom system and its assembly and adjustment method. The laser continuous zoom system comprises, in order along the optical path, a first fixed lens, a first variable magnification lens, a second variable magnification lens, a compensation lens group, and a second fixed lens. The laser continuous zoom system also includes a Leica camera and a micrometer collimator telescope. The Leica camera and the micrometer collimator telescope are aligned at the same height. The Leica camera can adjust its focal length and record the imaging position. The light emitted by the Leica camera passes through the center of the lens, and adjusting the focal length of the Leica camera can converge on the target surface of the micrometer collimator telescope. The laser continuous zoom system and its assembly and adjustment method of the present invention, by simulating the characteristics of laser imaging, can detect the imaging point of the continuous zoom system in real time, ensuring that the system's output optical path remains unchanged at a fixed point during the zoom process, thereby achieving optimal laser emission accuracy of the laser ranging telescope.

Description

Technical Field

[0001] The invention relates to a laser zoom system, in particular to a laser continuous zoom system and an assembly and adjustment method thereof. Background Art

[0002] Space target laser ranging technology can effectively improve the accuracy of space debris monitoring data and is of great significance for in-orbit space debris early warning. For laser emission systems, the laser generated by the laser must be transmitted through a telescope. Typically, the laser spot diameter emitted by the laser is about 20mm, with a divergence angle of 0.4mrad, while the telescope aperture is 700mm to 1000mm. In order to enhance the concentration of laser emission energy, improve the laser return rate at different orbital altitudes, and simultaneously perform laser beam expansion, it is necessary to continuously change the magnification of the output laser to increase the laser emission aperture and compress the divergence angle.

[0003] As a beam expansion method, a continuous zoom system should adhere to the following principles during zooming: 1. The laser beam maintains optical axis consistency before and after zooming; 2. The laser optical axis must not waver during zooming, meaning it must not "circle." Otherwise, the emitted laser will deflect from the telescope's pointing direction, reducing ranging accuracy or even making high-precision laser ranging impossible. Therefore, to achieve these principles, the zoom system's lenses must be aligned to ensure the system's optical axis does not shift.

[0004] There are many existing methods for adjusting zoom systems. Most of these methods are debugged through specific processing and measurement methods, including centering turning and centering adjustment. These methods are suitable for the adjustment of fixed-magnification lens barrels. Although the accuracy is relatively high, for continuous zoom systems, due to the presence of moving links, turning and milling during the adjustment process can easily damage the moving joints. For debugging the zoom process, the current method is to use a micrometer collimator telescope to measure the mechanical end faces of each lens barrel to ensure the imaging consistency of each lens barrel mechanical end face. This method is based on the assumption that the optical axis of the lens and the mechanical axis of the lens mount are consistent. If there is a deviation between the two, the adjustment cannot meet the accuracy requirements. Summary of the Invention

[0005] The present invention aims to solve the technical problems in the prior art and provides a laser continuous zoom system and an assembly and adjustment method thereof.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0007] A laser continuous zoom system comprises, in order along the optical path, a first fixed lens, a first zoom lens, a second zoom lens, a compensation lens group, and a second fixed lens; continuous zoom can be achieved by adjusting the intervals between the first zoom lens, the second zoom lens, and the compensation lens group;

[0008] The laser continuous zoom system is further provided with a Leica camera and a micro-collimation telescope at the incident laser and the exit laser positions respectively; the Leica camera and the micro-collimation telescope are aligned at the same height; the Leica camera can adjust the focal length and record the imaging position;

[0009] The light emitted by the Leica camera passes through the center of the lens, and the focus of the Leica camera can be adjusted to converge on the target surface of the micrometer collimating telescope.

[0010] In the above technical solution, the aperture of the incident laser is: less than or equal to 20 mm.

[0011] In the above technical solution, the maximum beam expansion ratio is 3.

[0012] A method for assembling and adjusting the laser continuous zoom system described in the above technical solution comprises the following steps:

[0013] Step 1: Align the Leica camera and the micro-collimation telescope at the same height;

[0014] Adjust the focal length of the Leica camera so that the focus converges on the center of the crosshairs on the target surface of the micrometer collimator telescope and record the imaging position;

[0015] Step 2: Install the first fixed lens;

[0016] Make the light emitted by the Leica camera pass through the center of the lens, adjust the focal length of the Leica camera so that the focus is on the target surface of the micro-collimation telescope, calculate the deviations Δx and Δy between the imaging point and the reference point, and adjust the two-dimensional tilt of the first fixed lens so that Δx and Δy are 0. The second step of adjustment is completed;

[0017] Step 3: Install the first zoom lens;

[0018] Make the light emitted by the Leica camera pass through the center of the lens, adjust the focal length of the Leica camera so that the focus is concentrated on the target surface of the micrometer collimator telescope, rotate the cam structure, make the first zoom lens reciprocate along the guide structure within the entire stroke range, and record the maximum deviation Δx between the imaging point and the reference point max , Δy max , adjust the two-dimensional tilt of the first zoom lens according to the offset, and reciprocate the first zoom lens again to make Δ smaller, and repeat the above process until Δ=0, then the adjustment of the first zoom lens is completed;

[0019] Step 4: Install and adjust the second zoom lens according to the method in step 3;

[0020] Step 5: Install the compensation lens assembly according to the method in step 3;

[0021] Step 6: Install the second fixed lens according to the method in step 2.

[0022] In the above technical solution, the installation method further includes the steps of adjusting the positions of the first zoom lens, the second zoom lens and the compensation lens group, and confirming that the imaging point position of the entire system remains fixed during the zoom process.

[0023] The beneficial effects of the present invention are:

[0024] The laser continuous zoom system and its assembly and adjustment method of the present invention can detect the imaging point of the continuous zoom system in real time by simulating the characteristics of laser imaging, ensuring that the system's output light path remains unchanged at one point during the zoom process, thereby achieving the optimal laser emission accuracy of the laser ranging telescope. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 It is a structural schematic diagram of the laser continuous zoom system of the present invention.

[0027] Figure 2 This is an optical schematic diagram of the laser continuous zoom system of the present invention.

[0028] Figure 3 The figure is a schematic diagram of the implementation process of the method for assembling and adjusting the laser continuous zoom system of the present invention.

[0029] Figure 4 The figure is a schematic diagram of the adjustment process of the laser continuous zoom system according to the present invention.

[0030] The reference numerals in the figures indicate:

[0031] 1-first fixed lens; 2-first variable magnification lens; 3-second variable magnification lens; 4-compensating lens group; 5-second fixed lens; 6-cam; 7-guide rod; 8-guide groove. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of the laser continuous zoom system of the present invention. The system comprises, in order along the optical path, a first fixed lens 1, a zoom lens group, a compensating lens group 4, and a second fixed lens 5. The zoom lens group comprises, in order along the optical path, a first zoom lens 2 and a second zoom lens 3. Furthermore, the laser continuous zoom system of the present invention includes a cam 6, a guide rod 7, and a guide slot 8. The specific operating principle is that as the cam 6 rotates, the zoom lens group and the compensating lens group 4 simultaneously move linearly along the guide rod 7 within the guide slot 8. The cam 6 then adjusts the gap between the zoom lens group and the compensating lens group 4 using a curve, achieving continuous zoom.

[0034] Figure 2 This is an optical schematic diagram of the laser continuous zoom system of the present invention. The incident laser with a diameter of 20mm is expanded to 60mm by the continuous zoom system, with a maximum expansion ratio of 3. When the lens group is tilted, there is an angle θ between the output optical axis and the theoretical optical axis. During the zoom process, θ changes in real time and does not have a fixed value, which affects the ranging angle. Figure 2 As shown, the present invention places a Leica camera and a micrometer collimator telescope at the incident laser and exit laser positions respectively, uses the Leica camera to simulate the incident laser, adjusts the focal length of the Leica camera to converge the exit light into an image, and uses the micrometer collimator telescope to receive the image and record the position of the imaging point; sequentially adjusts the continuously variable magnification lens group, monitors the imaging position in real time, and ensures that the imaging point position remains unchanged.

[0035] The present invention provides an assembly and adjustment method for a laser zoom system that uses a Leica camera and a micro-collimation telescope to monitor the position of the zoom system's imaging point in real time. First, the Leica camera and the micro-collimation telescope are placed on the same axis of an assembly and adjustment platform, ensuring their optical axes are at the same height. The focal length of the Leica camera is adjusted so that its imaging position is centered on the target surface of the micro-collimation telescope. The lens groups of the zoom system are then sequentially installed, and the imaging position on the target surface of the micro-collimation telescope is maintained stationary during zooming.

[0036] The overall implementation process of the continuous zoom system adjustment method of the present invention is as follows: Figure 3 and 4 As shown, it includes six steps:

[0037] Step 1: Establish the benchmark and align the Leica camera and the micro-collimation telescope at the same height. Adjust the focal length of the Leica camera so that the focus converges on the center of the crosshairs on the target surface of the micro-collimation telescope and record the imaging position.

[0038] Step 2: Install the first fixed lens 1. Allow the light emitted from the Leica camera to pass through the center of the lens. Adjust the focal length of the Leica camera so that the focus is on the target surface of the micro-collimation telescope. Calculate the deviations Δx and Δy between the imaging point and the reference point. Adjust the two-dimensional tilt of the first fixed lens 1 until Δx and Δy are 0. This completes the adjustment.

[0039] Step 3: Install the first zoom lens 2. Make the light emitted by the Leica camera pass through the center of the lens, adjust the focal length of the Leica camera so that the focus is on the target surface of the micrometer collimator telescope, rotate the cam 6 structure, and make the first zoom lens 2 reciprocate along the guide structure within the entire travel range, and record the maximum deviation Δx between the imaging point and the reference point. max , Δy max , adjust the two-dimensional tilt of the first variator lens 2 according to the offset, and reciprocate the first variator lens 2 again to make Δ smaller. Repeat the above process until Δ=0, and the adjustment of the first variator lens 2 is completed;

[0040] Step 4: Install and adjust the second zoom lens 3 according to the method in step 3; make the light emitted by the Leica camera pass through the center of the lens, adjust the focal length of the Leica camera so that the focus is on the target surface of the micrometer collimator telescope, rotate the cam 6 structure, make the second zoom lens 3 reciprocate along the guide structure within the entire stroke range, and record the maximum deviation Δx between the imaging point and the reference point max , Δy max , adjust the two-dimensional tilt of the second variator lens 3 according to the offset, and reciprocate the second variator lens 3 again to make Δ smaller. Repeat the above process until Δ=0, and the adjustment of the second variator lens 3 is completed;

[0041] Step 5: Install the compensation lens group 4 according to the method in step 3; make the light emitted by the Leica camera pass through the center of the lens, adjust the focal length of the Leica camera so that the focus is on the target surface of the micrometer collimator telescope, rotate the cam 6 structure, make the compensation lens group 4 reciprocate along the guide structure within the entire stroke range, and record the maximum deviation Δx between the imaging point and the reference point max , Δy max , adjust the two-dimensional tilt of the compensation lens group 4 according to the offset, and reciprocate the compensation lens group 4 again to make Δ smaller, and repeat the above process until Δ = 0, then the adjustment of the compensation lens group 4 is completed;

[0042] Step 6: Install the second fixed lens 5 according to the method in step 2; make the light emitted by the Leica camera pass through the center of the lens, adjust the focal length of the Leica camera so that the focus is on the target surface of the micro-collimation telescope, calculate the deviation Δx and Δy between the imaging point and the reference point, and adjust the two-dimensional tilt of the second fixed lens 5 so that Δx and Δy are 0, and the adjustment is completed;

[0043] Finally, rotate the cam 6 to check whether the imaging point position of the entire system remains fixed during the zoom process.

[0044] The laser continuous zoom system and its assembly and adjustment method of the present invention can detect the imaging point of the continuous zoom system in real time by simulating the characteristics of laser imaging, ensuring that the system's output light path remains unchanged at one point during the zoom process, thereby achieving the optimal laser emission accuracy of the laser ranging telescope.

[0045] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for assembling and adjusting a laser continuous zoom system, characterized in that: in: A laser continuous zoom system comprises, in order along the optical path direction, a first fixed lens (1), a first zoom lens (2), a second zoom lens (3), a compensation lens group (4), and a second fixed lens (5); continuous zoom can be achieved by adjusting the intervals between the first zoom lens (2), the second zoom lens (3), and the compensation lens group (4); The laser continuous zoom system is provided with a camera and a micro-collimation telescope at the incident laser and the exit laser positions respectively; the camera and the micro-collimation telescope are aligned at the same height; the camera can adjust the focal length and record the imaging position; The light emitted by the camera passes through the center of the lens, and the focal length of the camera is adjusted to converge on the target surface of the micro-collimation telescope; The adjustment method comprises the following steps: Step 1: Align the camera and micro-collimation telescope at the same height; Adjust the camera focal length so that the focus converges on the center of the crosshairs on the target surface of the micrometer collimator telescope and record the imaging position; Step 2: Install the first fixed lens (1); Make the camera's emitted light pass through the center of the lens, adjust the camera's focal length so that the focus converges on the target surface of the micrometer collimator telescope, calculate the deviations Δx and Δy between the imaging point and the reference point, adjust the two-dimensional tilt of the first fixed lens (1) so that Δx and Δy are 0, and then the second step of adjustment is completed; Step 3: Install the first zoom lens (2); The camera's emitted light passes through the center of the lens, the camera's focal length is adjusted so that the focus converges on the target surface of the micrometer collimator telescope, the cam structure is rotated, and the first variable magnification lens (2) moves back and forth along the guide structure within the entire stroke range, and the maximum deviation Δx between the imaging point and the reference point is recorded. max , Δy max , adjusting the two-dimensional tilt of the first variable magnification lens (2) according to the offset, and reciprocating the first variable magnification lens (2) again to make Δ smaller, and repeating the above process until Δ=0, then the adjustment of the first variable magnification lens is completed; Step 4: Install and adjust the second zoom lens (3) according to the method in step 3; Step 5: Install the compensation lens assembly (4) according to the method in step 3; Step 6: Install the second fixed lens (5) according to the method of step 2.

2. The adjustment method according to claim 1, characterized in that: The diameter of the incident laser is less than or equal to 20 mm.

3. The adjustment method according to claim 1, characterized in that: The maximum beam expansion ratio of the laser continuous zoom system is 3.

4. The adjustment method according to claim 1, characterized in that: The method further comprises the steps of adjusting the positions of the first zoom lens (2), the second zoom lens (3) and the compensation lens group (4) to ensure that the imaging point position of the entire system remains fixed during the zooming process.

Images