Computer-aided centering and alignment method for the corrector group of a primary focus optical system

Abstract

The present invention discloses a computer-aided centering and alignment method for a corrector lens group of a prime focus optical system. The steps include: substituting the measured data of the lenses into the theoretically designed optical system, re-optimizing the lens intervals and matching aberrations to obtain an optical system with optimized imaging quality; testing and adjusting each lens piece by piece, fitting the relative position parameters of the lenses, and substituting them into the optical software to calculate the alignment position and lens interval of the next piece; after all the alignments are completed, the centering instrument fits the optical axis of the corrector lens group and marks the offset position between the optical axis and the mechanical end face; constructing a three-dimensional model of the corrector lens group according to the fitted data; substituting the three-dimensional model fitted in the previous step into the optical design software, matching it with the main system, and re-optimizing the interval to obtain the final optical system. The method of the present invention does not require repeated disassembly, grinding, and can quantitatively calculate the amount and direction of aberrations after the alignment of the corrector lens group, improving the alignment accuracy of the prime focus telescope system and the alignment efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of optical instrument alignment, and particularly relates to a computer-aided centering alignment method for a corrector lens group of a prime focus optical system. Background Art

[0002] The contemporary astronomy has been developing rapidly. As the observation targets become more distant and complex, higher requirements are put forward for the imaging performance of telescopes. Compared with the reflective optical system, the prime focus optical system is a catadioptric system composed of an aspherical primary mirror and a transmissive corrector lens group, which has the advantages of higher light-gathering ability, smaller central obstruction, larger field of view, and more compact structure, and is gradually being applied in large-aperture and large-field-of-view ground-based astronomical telescopes. However, since the corrector lens group of the large-aperture prime focus system needs to cooperate with the primary mirror to correct aberrations, the imaging of the individual corrector lens is imperfect, the aperture is large, and the number of lenses is large, which increases the difficulty of centering alignment, resulting in a large gap between the imaging performance of the actually aligned system and the theoretical design. In order to improve the alignment accuracy of the corrector lens group and manufacture a prime focus telescope close to the theoretical design performance, it is urgent to adopt a computer-aided centering alignment method to accurately position the relative positions of each lens, predict in advance the installation and grinding amount of the next lens, analyze the alignment compensation amount in real time to guide centering alignment, quantitatively calculate the aberration amount and aberration direction after the alignment of the corrector lens group, and ensure that the image quality after the alignment of the corrector lens group is consistent with the theoretical design.

[0003] For the traditional centering alignment method of the corrector lens group, the lenses are adjusted one by one under the guidance of a centering instrument, and the gaskets are ground repeatedly until the eccentricity and tilt of each lens reach the design tolerance range. It is qualitatively considered that the corrector lens group meets the requirements, but the aberration amount and aberration direction are not clear, which brings many uncertainties to the later system integration, and the repeated grinding, disassembly and assembly of the lens group bring a great risk of lens damage. In addition, the traditional computer-aided lens alignment method directly measures the wave aberration of the system, substitutes it into a multiple neural network regression model to give the alignment prediction error, and measures the wave aberration again after alignment, repeating many times until the aberration requirements are met. The micro objective lens is generally small, and the disassembly and assembly risk is small, and the micro objective lens has perfect imaging and can directly measure the wave aberration. However, the corrector lens group of the prime focus telescope has a large aperture, with a diameter exceeding 300 mm and a weight exceeding 10 kg. The risk of lens breakage is large during disassembly and assembly, and the corrector lens group has imperfect imaging and cannot directly measure the wave aberration. It is obviously inappropriate to adopt the existing computer-aided alignment method. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides a computer-aided centering alignment method for a corrector lens group of a prime focus optical system.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A computer-aided centering and alignment method for a corrector group of a primary focus optical system, comprising the following steps:

[0007] Step 1: Substitute the measured data of the lenses into the theoretically designed optical system S0, re-optimize the intervals between the lenses, and re-match the aberrations to obtain the optical system S1 with optimized imaging quality;

[0008] Step 2: Test with a centering instrument, adjust piece by piece, measure the interval between two lenses with a lens locator; fit the relative position parameters of the lenses, and substitute them into the optical software to calculate the installation position and lens interval of the next piece;

[0009] Step 3: After all the alignment is completed, the centering instrument fits the optical axis of the corrector group, and marks the offset position between the optical axis and the mechanical end face to provide a quantitative reference for subsequent system integration; construct a three-dimensional model of the corrector group according to the fitted data;

[0010] Step 4: Substitute the three-dimensional model fitted in Step 3 into the optical design software, match it with the main system, and re-optimize the interval to obtain the final optical system S.

[0011] Further, Step 1 includes:

[0012] Step 1.1: Fit the refractive index of the lens material, measure the refractive index at 5 wavelengths, and fit it using the following schott formula to obtain the measured refractive index glass model, and substitute it into the optical design software;

[0013] n 2 = a0 + a1λ 2 + a2λ -2 + a3λ -4 + a4λ -6 + a5λ -8

[0014] In the formula: a0 to a5 are the fitted glass constants, λ is the wavelength, and n is the refractive index corresponding to the wavelength;

[0015] Step 1.2: Fit the mirror surface shape, measure the mirror surface shape, mark the mirror surface, and fit the surface shape using a combination of a quadratic surface, zernike polynomial, and periodic sag polynomial as follows to perform high-precision fitting of the low-frequency and medium-frequency errors of the lens, substitute it into the optical design software, and rotate the relative position of the lens to achieve complementary small aberrations;

[0016]

[0017] Where: z is the surface sag, r is the polar coordinate vector radius length in lens units, c is the curvature, k is the conic coefficient, α i The coefficient of the i-th aspheric surface, N is the number of Zernike coefficients, A iis the coefficient of the ith Zernike Standard polynomial, ρ is the normalized radial coordinate of the light ray, is the angular coordinate of the light ray, A is the amplitude of the periodic term, ω0 is the frequency of the periodic term (in units of the reciprocal of the length unit), is the phase shift;

[0018] Step 1.3: Measure the actual lens parameters, substitute them together with the refractive index and surface shape parameters into the optical software for fitting, adjust the lens, perform small aberration complementation, and obtain the optical system S1 with optimized imaging quality.

[0019] Furthermore, Step 2 includes:

[0020] Step 2.1: Install the initial lens as the optical axis reference of the correction lens group, then install the second lens, install it according to the position marks of the optical system S1, and use the centering instrument to guide the adjustment of the eccentricity and tilt of the second lens to the tolerance range;

[0021] Step 2.2: The centering instrument fits the optical axes of the two lenses and the tilt and eccentricity data relative to the optical axis, substitutes the fitting data into the optical system S1, and rematches the aberrations to obtain the optical system S2 with further optimized imaging quality;

[0022] Step 2.3: Keep the first and second lenses stationary, install the third lens according to the position marks of the optical system S2, and use the centering instrument to guide the adjustment of the eccentricity and tilt of the third lens to the tolerance range;

[0023] Step 2.4: The centering instrument fits the optical axes of the three lenses and the tilt and eccentricity data relative to the optical axis, substitutes the fitting data into the optical system S2, and rematches the aberrations to obtain the optical system S3 with even further optimized imaging quality;

[0024] Step 2.5: Repeat the above method to install all the lenses in sequence.

[0025] Furthermore, when installing and adjusting the lens, the eccentricity data of the lens is fitted in real time, substituted into the optical design software to optimize the interval and the rotation direction of the lens, and small aberration complementation is performed.

[0026] Furthermore, during the installation and adjustment process, the optical design software is used to quantitatively predict in advance the installation and grinding amount of the next spacer ring, and the grinding parameters are accurately positioned.

[0027] Furthermore, the best optical axis of the lens installed and adjusted by the above method is fitted, the relative position between the best optical axis and the mechanical end face is marked, and the lens aberration is quantitatively calculated.

[0028] Furthermore, in Step 2.5, when installing each lens, that is, adjusting one lens and then fitting and optimizing; during the optimization process, the system aberration is quantitatively calculated, and the installation and grinding amount of the next lens are predicted in advance, and the spacer ring is ground without disassembling the lens.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. The present invention is a computer-aided centering and alignment method. When adjusting and aligning a lens, it can fit the eccentricity data of the lens in real time, substitute it into the optical design software to optimize the interval and the lens rotation direction, achieve small aberration complementarity, ensure that the image quality after the adjustment and assembly of the corrector lens group conforms to the theoretical design, and improve the imaging quality of the final system;

[0031] 2. During the adjustment and alignment process, the grinding amount of the next spacer ring installation can be quantitatively predicted in advance through the optical design software, and the grinding parameters can be accurately positioned. There is no need to repeatedly disassemble and assemble the lens to grind the spacer ring, reducing the risk of lens breakage;

[0032] 3. For the optical system components with imperfect imaging, such as the corrector lens group of a prime focus telescope, computer-aided centering and alignment can be achieved, improving the adjustment and alignment efficiency, and providing a reference for the batch adjustment and assembly of large-aperture lens groups;

[0033] 4. The lens adjusted by this method not only has the eccentricity parameter within the tolerance range, but also can rotate to offset and reduce the influence of the lens processing surface shape on the imaging quality, achieve small aberration complementarity, and minimize the aberration to the greatest extent;

[0034] 5. The lens adjusted by this method can finally fit the best optical axis, mark the relative position of the best optical axis and the mechanical end face, quantitatively calculate the lens aberration, and guide the subsequent system integration;

[0035] 6. For the lens surface shape fitting of this method, a combination of a quadratic surface, a zernike polynomial, and a periodic height error polynomial is used to fit the surface shape, which can achieve high-precision fitting of the low-frequency and medium-frequency surface shape errors of the lens, and is closer to the actual adjusted optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flowchart of the computer-aided centering and alignment method established for the present invention;

[0037] Figure 2 It is a structural diagram of the corrector lens group in the embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of guiding the adjustment of the lens by the centering instrument in the embodiment of the present invention;

[0039] Figure 4 It is a graph of the centering instrument fitting the optical axis data in the embodiment of the present invention;

[0040] Figure 5 It is a graph of the simulated aberration by zemax software during the adjustment and assembly process in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings.

[0042] As Figure 1 shown, a computer-aided centering and alignment method for a primary focus corrector lens group includes the following steps:

[0043] Step 1: Substitute the measured data of the lenses (including material refractive index, central thickness, vertex curvature radius, and surface shape) into the theoretically designed optical system S0, re-optimize the intervals of each lens (keeping the other pose parameters unchanged to simplify the alignment steps), and obtain an optical system S1 with excellent imaging quality after re-matching the aberrations. The specific process is as follows:

[0044] Step 1.1: Fit the refractive index of the lens material. Measure the refractive index at 5 wavelengths, fit using the schott formula to obtain the measured refractive index glass model, and substitute it into the optical design software.

[0045] n 2 = a0 + a1λ 2 + a2λ -2 + a3λ -4 + a4λ -6 + a5λ -7 .

[0046] In the formula: a0 to a5 are the fitted glass constants, λ is the wavelength, and n is the refractive index corresponding to the wavelength.

[0047] Step 1.2: Fit the surface shape of the lens. Measure the surface shape of the lens using an interferometer or a high-precision profiler, make marks at the left, right, top, and bottom positions of the lens surface, and fit the surface shape using a combination of a quadratic surface, zernike polynomials, and periodic sag polynomials to achieve high-precision fitting of the low-frequency and medium-frequency errors of the lens. Substitute it into the optical design software and rotate the relative position of the lens to achieve complementary small aberrations.

[0048]

[0049] The above expression contains three parts, from left to right: the even aspherical part, the Zernike part, and the periodic sag part. Among them: z is the surface sag, r is the polar coordinate radius length in lens units, c is the curvature, k is the conic coefficient, αi is the coefficient of the i-th aspherical surface, N is the number of Zernike coefficients, Ai is the coefficient of the i-th Zernike Standard polynomial, ρ is the normalized radial coordinate of the light ray, is the angular coordinate of the light ray, A is the amplitude of the periodic term, ω0 is the frequency of the periodic term (in units of the reciprocal of the length unit), is the phase shift. For example, in the lens data editor, it is input in degrees, but converted to radians during calculation

[0050] Step 1.3: Measure the parameters such as the actual center thickness and vertex curvature of the lens, substitute them into the optical software for fitting together with the refractive index and surface shape parameters, adjust the lens to achieve complementary small aberrations, and obtain the optical system S1 with excellent imaging quality.

[0051] Step 2: Conduct a centering tester test, adjust each piece one by one, and measure the interval between the two lenses with a lens locator; fit the relative position parameters of the lenses and substitute them into the optical software to calculate the installation and adjustment position of the next piece and the lens interval. The specific process is as follows:

[0052] Step 2.1: Install the initial lens as the optical axis reference of the corrector group, then install the second lens, install it according to the position mark of the S1 system, and use the centering tester to guide the adjustment of the eccentricity and tilt of the second lens to the tolerance range;

[0053] Step 2.2: The centering tester fits the optical axes of the two lenses and the tilt and eccentricity data relative to the optical axis, substitutes the fitting data into the S1 system, and rematch the aberrations to obtain the optical system S2 with excellent imaging quality.

[0054] Step 2.3: Keep the first and second lenses stationary, install the third lens according to the position mark of the S2 system, and use the centering tester to guide the adjustment of the eccentricity and tilt of the third lens to the tolerance range;

[0055] Step 2.4: The centering tester fits the optical axes of the three lenses and the tilt and eccentricity data relative to the optical axis, substitutes the fitting data into the S2 system, and rematch the aberrations to obtain the optical system S3 with excellent imaging quality.

[0056] Step 2.5: Repeat the above method to install all the lenses one by one. Install one piece, adjust one piece, and then fit and optimize. When optimizing, the system aberrations can be quantitatively calculated, and the installation, adjustment, and grinding amount of the next piece can be predicted in advance, without removing the lens to grind the spacer ring.

[0057] Step 3: After all the installation and adjustment are completed, the centering tester fits the optical axis of the corrector group and marks the offset position between the optical axis and the mechanical end face, providing a quantitative reference for subsequent system integration. Construct a three-dimensional model of the corrector group according to the fitting data.

[0058] Step 4: Substitute the three-dimensional model fitted in Step 3 into the optical design software, match it with the main system, and re-optimize the interval to obtain the final optical system S.

[0059] In this embodiment, a 320-aperture corrector group is adopted, and the parameters of the corrector group are: aperture: 320 mm; total length: 480 mm; lens tolerance requirements: tilt ±15″, eccentricity ±0.05 mm; image quality: PV of the main system ≤ λ / 4, λ = 632.8 nm. The structural schematic diagram of the 320-aperture corrector group is as Figure 2As shown in the figure, the system consists of six lenses (i.e., the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6). The lens spacing is controlled by spacer rings. The maximum lens aperture is 320 mm, and the weight is about 10 kg. When aligning and adjusting, the first lens 1 is used as the reference lens.

[0060] The computer-aided centering and alignment method includes:

[0061] 1. Substitute the measured data of the lenses (including material refractive index, central thickness, vertex curvature radius, and surface shape) into the theoretically designed optical system S0, re-optimize the intervals between each lens (keeping other pose parameters unchanged to simplify the alignment and adjustment steps), and re-match the aberrations to obtain an optical system S1 with excellent imaging quality. The specific process is as follows:

[0062] 1.1. Fit the refractive index of the lens material. Measure the refractive index at 5 wavelengths and use the Schott formula for fitting to obtain the measured refractive index glass model, and substitute it into the ZEMAX software (the computer-aided centering and alignment method of the present invention involves many optical software, not just the ZEMAX software).

[0063] 1.2. Fit the surface shape of the lens. Measure the surface shape of the lens with a high-precision profiler, mark the left, right, upper, and lower positions of the mirror, and use a combination of quadratic surface, Zernike polynomial, and periodic height error polynomial to fit the surface shape and substitute it into the ZEMAX software.

[0064] 1.3. Measure parameters such as the central thickness and vertex curvature of the lens, and substitute them into the ZEMAX software for fitting together with the refractive index and surface shape parameters. As Figure 5 shown, where Figure 5 in (a) is the wave aberration of the theoretically designed optical system, Figure 5 in (b) is the wave aberration of the optical system after substituting the measured data, Figure 5 in (c) is the wave aberration of the optimized optical system. During the optimization process, adjust the lenses to achieve small aberration compensation and obtain an optical system S1 with excellent imaging quality.

[0065] 2. Under the guidance of a centering instrument, adjust each lens one by one. The adjustment process is as Figure 3 shown, where Figure 3 in (a) is the eccentricity of the centers of the upper and lower surfaces of the lens relative to the reference axis, Figure 3 in (b) is the edge height difference of the lens relative to the reference axis. After adjusting each lens one by one, there is eccentricity data for each lens. Fit the eccentricity data of multiple mirrors to obtain the best-fitted optical axis, and substitute it into the optical software to calculate the installation position and lens interval of the next lens. The specific process is as follows:

[0066] 2.1. Install mirror 1 as the reference for aligning the optical axis of the correcting lens group. Then install mirror 2 according to the position markings of the S1 system. The centering instrument guides the adjustment of the eccentricity and tilt of the second lens to within the tolerance range.

[0067] 2.2. The centering instrument fits the optical axes of the two lenses and the data of the tilt and eccentricity relative to the optical axis. The fitted data is substituted into the S1 system, and the aberrations are rematched to obtain an optical system S2 with excellent imaging quality.

[0068] 2.3. Keep the first and second mirrors stationary. Install the third lens according to the position markings of the S2 system. The centering instrument guides the adjustment of the eccentricity and tilt of the third lens to within the tolerance range.

[0069] 2.4. The centering instrument fits the optical axes of the three lenses and the data of the tilt and eccentricity relative to the optical axis. The fitted data is substituted into the S2 system, and the aberrations are rematched to obtain an optical system S3 with excellent imaging quality.

[0070] 2.5. Repeat the above method to install all the lenses in sequence. Install one lens, adjust it, and then fit and optimize. When optimizing, the system aberrations can be quantitatively calculated, and the installation, adjustment, and grinding amounts of the next lens can be predicted in advance, without disassembling the lens to grind the spacer ring.

[0071] 3. After all the installation and adjustment are completed, the centering instrument fits the optical axis of the correcting lens group. As shown in, BFOA is the fitted optical axis, 1 is the optical axis of lens 1, 2 is the optical axis of lens 2, 3 is the optical axis of lens 3, 4 is the optical axis of lens 4, 5 is the optical axis of lens 5, and the offset position between the fitted optical axis and the mechanical end face is marked, providing a quantitative reference for the subsequent system integration. A three-dimensional model of the correcting lens group is constructed according to the fitted data. Figure 4 As shown, BFOA is the fitted optical axis, 1 is the optical axis of lens 1, 2 is the optical axis of lens 2, 3 is the optical axis of lens 3, 4 is the optical axis of lens 4, 5 is the optical axis of lens 5, and the offset position between the fitted optical axis and the mechanical end face is marked, providing a quantitative reference for the subsequent system integration. A three-dimensional model of the correcting lens group is constructed according to the fitted data.

[0072] In summary, the present invention provides a computer-aided centering and alignment method for a primary focus correcting lens group. When installing and adjusting the first lens, the data can be fitted in real time, the adjustment direction can be judged, and the installation, adjustment, and grinding amounts of the next lens can be quantitatively predicted in advance, accurately positioning the grinding parameters, without repeated disassembly and grinding. After the installation and adjustment are completed, the centering instrument can be used to fit the optical axis. The fitted data and the lens surface shape data are substituted into the optical design software for system imaging simulation, and the aberration amount and aberration direction after the installation and adjustment of the correcting lens group can be quantitatively calculated, ensuring that the image quality after the installation and adjustment of the correcting lens group is consistent with the theoretical design, providing a quantitative reference for the subsequent system integration, thereby improving the installation and adjustment accuracy of the primary focus telescope system and improving the installation and adjustment efficiency.

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A computer-aided centering and alignment method for the correcting lens group of a primary focus optical system, characterized in that, It includes the following steps: Step 1: Substitute the measured data of the lenses into the theoretically designed optical system S0, re-optimize the intervals between the lenses, and re-match the aberrations to obtain the optical system S1 with optimized imaging quality; Step 2: Perform centering tests, adjust each piece one by one, and measure the interval between two lenses; fit the relative position parameters of the lenses, and substitute them into the optical software to calculate the installation position and lens interval of the next piece. Step 2 specifically includes: Step 2.1: Install the initial lens as the optical axis reference of the correction lens group, and then install the second lens. Install it according to the position marks of the optical system S1, and use the centering instrument to guide the adjustment of the eccentricity and tilt of the second lens to the tolerance range; Step 2.2: The centering instrument fits the optical axes of the two lenses and the data of the tilt and eccentricity relative to the optical axis, and substitutes the fitted data into the optical system S1 to re-match the aberrations to obtain the optical system S2 with further optimized imaging quality; Step 2.3: Keep the first and second lenses stationary, install the third lens according to the position marks of the optical system S2, and use the centering instrument to guide the adjustment of the eccentricity and tilt of the third lens to the tolerance range; Step 2.4: The centering instrument fits the optical axes of the three lenses and the data of the tilt and eccentricity relative to the optical axis, and substitutes the fitted data into the optical system S2 to re-match the aberrations to obtain the optical system S3 with even more optimized imaging quality; Step 2.5: Repeat the above method to install all the lenses in turn; Step 3: After all the alignment and adjustment are completed, the centering instrument fits the optical axis of the correction lens group, and marks the offset position between the optical axis and the mechanical end face to provide a quantitative reference for subsequent system integration; construct a three-dimensional model of the correction lens group according to the fitted data; Step 4: Substitute the three-dimensional model fitted in Step 3 into the optical design software, match it with the main system, and re-optimize the interval to obtain the final optical system S.

2. The computer-aided centering and alignment method for the corrector group of the primary focus optical system according to claim 1, characterized in that, Step 1 includes: Step 1.1: Fit the refractive index of the lens material. Use the following schott formula for fitting to obtain the measured refractive index glass model, and substitute it into the optical design software; n 2 = a0 + a1λ 2 + a2λ -2 + a3λ -4 + a4λ -6 + a5λ -8 In the formula: a0 to a5 are the fitted glass constants, λ is the wavelength, and n is the refractive index corresponding to the wavelength; Step 1.2: Fit the surface shape of the lens. Measure the actual surface shape of the lens, mark the lens surface, and use the combination of the following quadratic surface, zernike polynomial, and periodic sag polynomial to fit the surface shape to perform high-precision fitting of the low-frequency and medium-frequency errors of the lens, substitute it into the optical design software, and rotate the relative position of the lens to achieve small aberration complementarity; Where: z is the surface sag, r is the polar coordinate radius length in lens units, c is the curvature, k is the conic coefficient, α i The coefficient of the i-th aspheric surface, N is the number of Zernike coefficients, A i Is the coefficient of the i-th Zernike Standard polynomial, ρ is the ray normalized radial coordinate, Is the ray angular coordinate, A is the amplitude of the periodic term, ω0 is the frequency of the periodic term, in units of the reciprocal of the length unit, Is the phase shift; Step 1.3: Measure the lens parameters, substitute them together with the refractive index and surface shape parameters into the optical software for fitting, adjust the lens, and perform small aberration complementarity to obtain the optical system S1 with optimized imaging quality.

3. The computer-aided centering and alignment method for the main focus type optical system correction lens group according to claim 1, characterized in that, When aligning and adjusting the lens, fit the eccentricity data of the lens in real time, substitute it into the optical design software to optimize the interval and the rotation direction of the lens, and perform small aberration complementarity.

4. The computer-aided centering and alignment method for the corrector group of the primary focus optical system according to claim 1, characterized in that, During the alignment and adjustment process, quantitatively predict the installation and grinding amount of the next spacer in advance through the optical design software, and accurately locate the grinding parameters.

5. The computer-aided centering and alignment method for the correcting lens group of the primary focus type optical system according to claim 1, characterized in that, Fit the best optical axis of the lens adjusted by the method, mark the relative position between the best optical axis and the mechanical end face, and quantitatively calculate the lens aberration.

6. The computer-aided centering and alignment method for the correction lens group of the primary focus optical system according to claim 1, characterized in that, In Step 2.5, for each lens installed, adjust the lens and then perform fitting and optimization; during the optimization process, quantitatively calculate the system aberration and predict in advance the adjustment, repair, and grinding amount of the next lens, and repair the spacer without disassembling the lens.

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