Ms. Xufei Yu Profile

Xufei Yu

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Proceedings Article | 13 December 2024 Paper

Investigation into optimizing the radial temperature uniformity of optical lenses

Yuhan Li, Baoyu Yang, Junfei Li, Xufei Yu, Jiaqing Xu, Yinong Wu

Proceedings Volume 13505, 135050A (2024) https://doi.org/10.1117/12.3048261

KEYWORDS: Telescopes, Infrared radiation, Thermography, Emissivity, Design, Lenses, Temperature metrology, Mathematical optimization, Thermal modeling, Resistance

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To ensure the photometric accuracy of the transit telescope on Earth 2.0 and reduce the defocusing caused by thermal deformation, it is necessary to improve the radial temperature gradient of its lens. In this study, a thermal theoretical analysis of the lens to determine the heat transfer paths is conducted firstly, thereby the causes of significant radial temperature differences in the optical lens are clarified. Based on this analysis, a surrogate model was trained using thermal simulation calculations, enabling effective sensitivity analysis of all thermal factors affecting lens temperature uniformity, which identified the key factors and directions for thermal design optimization. For these key factors, a novel and systematic solution to improve the radial temperature uniformity of the optical lens was proposed for the first time. The main measures include increasing the thermal resistance between the lens and the telescope tube, reducing the temperature difference between the telescope tube and the lens, employing new lens coating techniques, and adjusting the temperature of the hood. With these thermal control technologies, simulation results show that the radial temperature difference of the first lens, when exposed to the harsh thermal environment of cold space, was reduced from 10K (before) to within 2K(after), greatly enhancing the radial temperature uniformity of the transit telescope lens. The method is derived from a general structural approach, making it applicable to other optical projects.

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