Ms. Yamei Yin Profile

Yamei Yin

at XIOPM CAS

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Proceedings Article | 13 November 2024 Paper

A high-accuracy assembling method of R-C system with flexible support structure

Yamei Yin, Yun Chen, Xing Qin, ZhiGuo Li, JiaChun Zhou

Proceedings Volume 13280, 132800S (2024) https://doi.org/10.1117/12.3047649

KEYWORDS: Mirrors, Wavefront aberrations, Wavefront errors, Reflection, Matrices, Mirror surfaces, Geometrical optics, Lenses, Design, Imaging systems

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R-C optical systems commonly used in long focal length imaging, long-distance detection fields such as aerospace and space optical communication. In this paper, the R-C optical system consists of two reflective mirrors and four correction lenses. The primary mirror adopts three sets of flexible structures for back support, which can provide a reasonable access to reduce the influence of the mirror's self-weight and thermal distortion on the mirror surface. For the high accuracy assembly, the simulation has been conducted firstly by sensitivity matrix method to figure out the sensitive components and corresponding geometrical parameters about the focal length, wavefront aberration, and energy concentration and an assembling method is proposed. Experiment is carried out to demonstrate the feasibility of the proposed calibration method, for the wavefront aberration with RMS value of center of view is 0.17λ (λ=0.6328nm), and the diameter of spot dispersion about center field of view is 12.35μm, the diameter of spot dispersion in full field of view better than 18μm can be achieved.

Proceedings Article | 24 November 2021 Paper

Alignment control in off-axis Gregorian system with reverse optimization method

Yamei Yin, Xing Fu, Yu Lei, Mingqiang Cao

Proceedings Volume 12069, 1206915 (2021) https://doi.org/10.1117/12.2606822

KEYWORDS: Monochromatic aberrations, Mirrors, Off axis mirrors, Wavefront aberrations, Telescopes, Imaging systems, Active optics, Reflectivity, Optical calibration, Error analysis

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Off-axis refractive system with the noticeable advantages such as high resolution, large view field and central obscuration removed, has been one of the powerful systems for space astronomical telescopes in recent years. However, misalignment errors and surface error of mirrors are significant especially in the alignment progress of off-axis reflective telescope with large aperture. Computer aided assembling (CAA) jointly provide a robust misalignment correction method to ensure the accurate alignment of telescope. In this paper, system aberration of misalignment coaxial system with two mirrors is analyzed in detail, moreover, the off-axis system is studied further, especially in the off-axis Gregorian system. And the feasibility of correction values solution about off-axis refractive system is discussed. Both the simulation and experiment results demonstrate the feasibility of the proposed alignment method and high accuracy has been achieved. In the testing off-axis Gregorian system, the primary mirror is paraboloid with 1200 mm diameter, 210 mm off-axis distance, and the second mirror is ellipsoid with off-axis distance 129.0 mm, focal length 425 mm and 2125 mm, respectively. For the testing off-axis Gregorian system, the RMS value of primary mirror and second mirror are 0.021 λ and 0.027 λ (λ = 0.6328 nm), and the testing optimization result of system wavefront aberration with RMS value is better than 0.058 λ is achieved. The reverse optimization method testing can achieve high-accuracy measurement ability, which provides efficient and flexible way for the off axis refractive system from various types of elements with complex surfaces.

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