Stray Light Analysis for the AIMS Telescope

Stray light is an important component affecting the overall performance of telescopes. Especially for infrared solar telescopes, the internal thermal radiation brings more stray light sources. In this paper, a 3D ASAP model is established by stray light theory and the real opto-mechanical structure. A stray light ratio (SLR) is used to evaluate the imaging performance of the AIMS telescope. Both sources of stray light, non-thermal and thermal radiation, are analyzed for the visible system, 8–10 μm system and FTIR system in detail. The results indicate that the SLR is 9.31\times10^-6 in the visible system, 2.83\times10^-4 in the 8–10 \mu m system, and 1.54\times10^-4 in the FTIR system. This verifies that the opto-mechanical system design of the AIMS telescope can effectively suppress stray light, being beneficial for both imaging and magnetic field observations.