Research on quartz flat mirror's thermal deformation under the condition of non uniform heating

The optical system used in aerospace works under a very difficult aerospace condition. The temperature difference between the sides which one is facing the sun and the other one is opposite the sun can reach about 200 degrees C. These temperature grids can bring thermal deformation to the optical components and then influence the whole system's image or detect results. To measure and analysis the deformation, we first use finite element method to establish a heat exchange model with definite temperature boundary condition to simulate the thermal distribution situation of an optical mirror, and then we establish a laboratory experimental environment and use the thermal imager to measure the temperature distribution on the surface of the mirror and use Zygo GPI XP-D/1000 interferometer to measure the thermal deformation, from the experimental results, we can see that the definite temperature boundary condition is good enough. And the definite flow boundary condition is not necessary under this non uniform heating situation.