旋转式大气色散校正器的优化设计方法

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关键词：大气色散；光线追迹；大气色散校正器；光轴偏移中图分类号：TP394.1;TH691.9 文献标志码：Adoi：10.37188/CO.2024-0204CSTR：32171.14.CO.2024-0204

Abstract： The counter-rotating prisms atmospheric dispersion corrector （ADC） has been widely used for the calibration of large-aperture astronomical telescopes.To achieve an optimal design method for the counterrotating prism ADC，effectively compensate for atmospheric dispersion，and suppress the optical axis drift introduced by the ADC， we establish a vector model for ray tracing of the counter-rotating prism ADC based on traditional atmospheric dispersion compensation theory.The vector models of dispersion compensation and optical axis drift are then derived. Using this mathematical model， the impacts of different parameters of the ADCs on the dispersion compensation effect， prism rotation angle，and optical axis drift are simulated and analyzed. The simulation results show that when compensating for the same atmospheric dispersion by using the counterrotating ADC with diferent material combinations and bonding types， the rotation angle of the prism group remains relatively consistent， and the diferences increasing as the zenith angle increases. Choosing materials with similar refractive indices near the central wavelength reduces chromatic aberation in the ADC output light and improves dispersion compensation performance. When compensating for atmospheric dispersionat different zenith angles，the offset angle of the system's optical axis decreases as the number of bonded surfaces increases. Specifically，each additional bonded surface of the optical axis drift angle can be reduced by one order of magnitude. In practical ADC design， dispersion can be effectively compensated， and optical axis drift can be suppressed by controling the number of bonded surfaces and material selection. Kev words： atmosnheric dispersion： rav tracing： atmospheric disnersion corrector： ontical axis drift

1引言

大气色散校正器（atmosphericdispersioncor-rector，ADC）通常由棱镜组成，通过棱镜或棱镜组的相对运动补偿大气色散1，相比于图像处理方法，使用ADC可以更有效地校正大天顶角时的大气色散，因此国内外大型望远系统主要使用ADC对大气色散进行校正。（剩余11168字）