Multi-physical Field Coupling Simulation of Off-axis Four-mirror Optical System
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摘要: 光机热仿真分析是预测光学系统光学性能及结构优化的有效手段，本文提出了一种基于有限元仿真分析软件COMSOL Multiphysics，耦合固体传热学、固体力学以及几何光学的多物理场耦合建模方法，实现了离轴四反光学系统的光机热一体化仿真，避免了传统的光机热仿真分析在不同软件间信息传递和转换的过程，提高了仿真的集成性。本文针对离轴四反光学系统构建其多物理场耦合仿真分析模型，分析了光学系统在不同温度条件下的结构变形和光学镜面变形，并通过光线追迹和点列图判断光学性能变化，为后续开展光学系统的优化提供了一种有效手段。Abstract: Optical structure–thermal simulation analysis is an effective method for predicting optical properties and optimizing optical systems. In this study, a multi-physical field coupling modeling method based on the COMSOL multiphysics finite element analysis software, coupled with heat transfer, solid mechanics, and geometric optics, is proposed. Compared with the traditional structure-thermal-optical property simulation analysis method, this method does not require surface fitting for optical lenses or data transmission through multiple software, improving the efficiency and accuracy of the simulation. A multi-physical field-coupling simulation analysis model is constructed for an off-axis four-mirror optical system. The structural and optical mirror deformations of the optical system under different temperature conditions are analyzed, and the optical performance changes are determined using ray tracing and spot diagrams, resulting in effective optimization of the optical system.
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图 2 离轴四反共体三光合一光学系统
Figure 2. Off-axis four-reflection catadioptric tri-light fusion optical system
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