Research on optimization of alignment algorithm for off-axis telescopes wavefront active correction

Lei, Yu; Ma, Caiwen; Li, Hua; KANG, Shifa; Fu, Xing; Cao, Mingqiang; Yin, Yamei

doi:10.1117/1.oe.61.11.115105

Cited by 3 publications

(4 citation statements)

References 20 publications

(29 reference statements)

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“…The optical system has low and high-order aberrations in a misaligned state, and typically, the alignment process only concentrates and eliminates low-order aberrations [14][15][16][17]. High-order aberrations are influenced by environmental and surface errors, which cannot be eliminated through alignment.…”

Section: Sensitivity Matrix Analysis and Calculationmentioning

confidence: 99%

Simulation alignment of optical system for space gravitational wave telescope

Yu,

Huang,

Liu

et al. 2024

Meas. Sci. Technol.

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The performance of telescopes, important components of space interferometry systems, directly affects the accuracy of gravitational wave signals. Space gravitational wave telescopes typically employ an off-axis four-mirror system. When aligned, this system not only has multiple misalignments, but also exhibits interrelated aberrations from various misalignments. These characteristics may lead to difficult alignment of the telescope system as well as significant deviation between the position of the telescope after alignment and the ideal position. To address the aforementioned issues, first, a sensitivity matrix equation was established between the misalignment of optical components and the Fringe Zernike coefficients. Based on the sensitivity matrix equation, a damping least-squares evaluation function was constructed to reduce the significant deviation between the aligned and ideal positions. Second, a typical optical system of a space gravitational wave telescope was designed, and the sensitivity matrix was calculated. The relationship between the wavefront distortions caused by misalignments in each optical component was examined. To simplify telescope installation, a strategy using secondary mirrors as compensatory elements was proposed. Finally, to verify the effectiveness of the scheme, 200 sets of tolerance files were randomly generated. Based on the evaluation function of the damping least-squares method, a reasonable damping factor was set to limit the solution range of the misalignment amount, which enabled calculating the secondary mirror compensation amount. Experimental results indicate that after aligning the 200 random telescope files, the root-mean-square wavefront error was reduced to less than 0.0030λ, and the maximum error between the magnification after alignment and the ideal position magnification was only 0.57%, which confirms the feasibility of this alignment scheme.

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Section: Sensitivity Matrix Analysis and Calculationmentioning

confidence: 99%

Simulation alignment of optical system for space gravitational wave telescope

Yu,

Huang,

Liu

et al. 2024

Meas. Sci. Technol.

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“…( 6) is a variable. In order to choose the appropriate damping coefficients, the adaptive damping least squares method 14 is used to achieve excellent wavefront. Figure 18 depicts the principle of the algorithm.…”

Section: M1-m2 System Alignmentmentioning

confidence: 99%

Optical alignment technology for 1-meter accurate infrared magnetic system telescope

Fu,

Lei,

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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Accurate infrared magnetic system (AIMS) is a ground-based solar telescope with the effective aperture of 1 m. The system has complex optical path and contains multiple aspherical mirrors. Since some mirrors are anisotropic in space, parallel light undergoes complex spatial reflection after passing through the optical pupil. It is also required that part of the optical axis coincides with the mechanical rotation axis. The system is difficult to align. This article proposes two innovative alignment methods. First, a modularized alignment method is presented. Each module is individually assembled with optical reference reserved. System integration can be completed through optical reference of each module. Second, computer-aided alignment technology is adopted to achieve perfect wavefront. By perturbing the secondary mirror (M2), the influence of M2 position on the wavefront is measured and the mathematical relationship is obtained. Based on the measured wavefront data, the least squares method is used to calculate the M2 alignment and multiple adjustments have been made to M2. The final system wavefront has reached RMS ¼ 0.12 λ@632.8 nm. Through observations of stars and sunspots, it has been demonstrated that the optical system has good wavefront quality. The observed sunspot is clear with the penumbral and umbra discernible. The proposed method has been verified and provides an effective alignment solution for complex off-axis telescope with large aperture.

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“…Then the computer-aided alignment method is used to measure the wavefront and adjust the secondary mirror to ensure excellent wavefront quality. Specific adjustment methods are beyond the scope of this paper [9] .…”

Section: Optical Axis Reference For M1-m2 Systemmentioning

confidence: 99%

“…Figure 1 illustrates the overall optical system. The conventional alignment methods cannot be applied [1][2][3][4][5][6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Optical axis consistency alignment method for 1m-diameter solar telescope

Xing,

Lei,

Bindong

et al. 2023

Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manu

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Research on optimization of alignment algorithm for off-axis telescopes wavefront active correction

Cited by 3 publications

References 20 publications

Simulation alignment of optical system for space gravitational wave telescope

Simulation alignment of optical system for space gravitational wave telescope

Optical alignment technology for 1-meter accurate infrared magnetic system telescope

Optical axis consistency alignment method for 1m-diameter solar telescope

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