Time Characteristics of the Imaging Quality Degradation Caused by Aero-Optical Effects Under Hypersonic Conditions
Lin Ju, Zhigang Fan, Bo Liu, Ming Yue, Xiaotian Shi, Xueshen Li
Abstract
In this study, the time characteristics of the image quality degradation caused by aero-optical effects in time-varying hypersonic conditions have been investigated to ensure the precision of the guidance capability. The time-accurate imaging scheme based on time discretization has been used to predict the imaging quality of the infrared detection system caused by aero-optical effects. Using wave aberration, point spread function, and peak signal-to-noise ratio as imaging evaluation indicators, the time characteristics of the image quality degradation caused by aero-optical effects under hypersonic conditions have been obtained. During the working process, the image quality degradation caused by the aero-optical transmission effect is not obvious, and limited influence mainly comes from the aero-optical transmission effect of the flow field. With time marching, the aero-thermal radiation effect will rapidly degrade the image quality. The influence of the aero-thermal radiation predominantly determines the image deterioration.