Optical Window Environment Adaptation Analysis of Optical Wavefront Measurement System

The optical wave wavefront measurement system can perform non-contact real-time quantitative monitoring of the gas flow rate according to the gas density changes in the wind tunnel test. Since the quality of the optical surface of the wind tunnel window directly affects the acquisition accuracy of wavefront information, it is necessary to evaluate the adaptability of the opto-mechanical structure to fluid load in the development stage. To solve this problem, this paper proposes a gas flow field change model based on Finite Element Analysis (FEA). By calculating the fluid-structure coupling response of the wind tunnel window, the displacement field of the wind tunnel window and the maximum displacement of the node are obtained. It is 0.00018mm, and the result shows that the window glass has good environmental adaptability at a flow rate of 885m/s.