Finite element analysis on ambient thermal stability of large aperture optical element

This paper discusses the deformation theory of large aperture optical element under thermal loads, and builds the finite element model by the software ANSYS. High precision sensors are used to measure the temperature around the optical elements in the target building and temperature change curve are plotted. The biggest temperature margin is 0.3 ℃ in 2 h. The biggest temperature margin is loaded on the finite element model of the optical element and the deformation of the optical element is got. The results indicate that the deformation of the optical element satisfy the stability requirement under present temperature control situation. At the same time, the deformation of the optical element under various temperature margins is calculated. The results indicate that the deformation of the