Mr. Yongxing Yang Profile

Yongxing Yang

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Proceedings Article | 30 April 2024 Paper

Study of large solar telescope mirror seeing

Yan Wang, Yong Xing Yang, Jin Peng Li, Qing Sheng Zhu

Proceedings Volume 13153, 131530Y (2024) https://doi.org/10.1117/12.3018350

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The heated air formed inside a solar telescope due to solar radiation will warm up the mirror surface, and local atmospheric turbulence will be generated above the mirror surface, which will cause the mirror seeing and thus the serious attenuation of image quality. In this paper, based on the theory of atmospheric turbulence, we analyze the physical process of mirror seeing produced by turbulent shear airflow, and use the experimental data of 1550mm large diameter hyperboloid mirror to derive and verify the theoretical model of mirror seeing. The effect of the change of temperature difference between the mirror and the surrounding air on the mirror seeing was experimented under two conditions of free convection and forced convection, respectively, at different mirror wind speeds. The results show that it is clear that the temperature difference between the mirror surface and the surrounding air is strongly correlated with the seeing, and the mirror seeing can be reduced by increasing the active ventilation. The mirror seeing is 0.98" at free convection of 4°C, 0.20" at forced convection with low wind speed, and 0.12" at forced convection with high wind speed under a mirror-air temperature difference of 3°C. The research results aim to reveal the formation mechanism and propagation law of air turbulence and its influence on the image quality degradation of the telescope, and lay the foundation for improving the working resolution of the large solar telescope.

Proceedings Article | 20 January 2023 Paper

Analysis and detection of optical path error of large aperture plane mirror

Xinrui Wang, Yongxing Yang, Jinpeng Li, Xinhua Lai, Runfu Peng, Qitong Li

Proceedings Volume 12559, 1255905 (2023) https://doi.org/10.1117/12.2646978

KEYWORDS: Mirrors, Error analysis, Shape analysis, Astronomical imaging, Spherical lenses, Computer simulations, Interferometers, Data modeling, Detection and tracking algorithms, Photovoltaics

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When the Ritchey-Common method is used for high-precision surface shape detection of large-aperture plane mirrors, a reflective spherical mirror needs to be used to build the detection optical path. When building the detection optical path, the plane mirror and the spherical mirror has a large diameter and a long detection optical path, so there are various artificial adjustment errors. In order to solve the problems of high-precision surface shape detection of large-diameter plane mirrors, two common adjustment errors of eccentricity and tilt during optical path detection are analyzed. By using optical software to build a large-diameter plane mirror detection optical path model, set different eccentricity and tilt errors to obtain the system wave aberration, solve the system wave aberration data to obtain the plane mirror shape to be measured, and compare it with the preset standard surface shape. The simulation of a 2m plane mirror shows that the difference between the two Ritchey angles is in the range of 11°~30°. When the eccentricity error is controlled within 5% of the aperture and the tilt error is controlled within 1°, the surface shape recovery results are different from the standard surface RMS by the order of 10^-3λ. Based on the above error simulation analysis, the actual Φ2m plane mirror shape detection is guided, and the results show that the RMS of the plane mirror reaches 0.0238λ, and the PV is 0.1629λ (λ=0.6328um). The purpose of this paper is to reveal the influence of the optical path adjustment error on the shape of the 2m plane mirror, so as to control the error of the plane mirror shape detection of the actual large-aperture mirror.

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