The imaging quality of the aerodynamically heated optical dome was evaluated under the comprehensive influence of aero-optical transmission effect and aero-thermal radiation effect. The ray propagating algorithm based on the fourth order Runge-Kutta method was used to trace the target ray and the thermal radiation ray of the optical dome. Three imaging quality evaluation parameters were proposed to evaluate aero-optical effect: Modulation transfer function (MTF), irradiance, peak signal-to-noise ratio (PSNR) of distorted images. The results show that: as the flight speed increased, the MTF decreased observably compared with the diffraction-limit MTF, the irradiance on the photosensitive surface of the detector increased gradually, and the distorted imaging quality under the influence of the comprehensive aero-optical effect gradually deteriorated. However, as the thickness of the optical dome increased, the MTF decreased sharply and the irradiance decreased gradually, that indicated the aero-optical transmission effect was reinforced and the aero-thermal radiation effect was weakened. The imaging quality improved with thickness increasing. The influence of aero-thermal radiation effect on the PSNR of the image was more serious than that of the aero-optical transmission effect.

中文翻译：

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评估受光传输效应和热辐射效应影响的光学圆顶的成像质量

在气动传递效应和热辐射效应的综合影响下，对气动加热光学圆顶的成像质量进行了评估。采用基于四阶Runge-Kutta方法的射线传播算法，对光学球罩的目标射线和热辐射线进行跟踪。提出了三种成像质量评估参数来评估航空光学效果：调制传递函数（MTF），辐照度，畸变图像的峰值信噪比（PSNR）。结果表明：随着飞行速度的增加，MTF与衍射极限MTF相比明显下降，探测器光敏面上的辐照度逐渐增大，在综合航空光学效应的影响下成像质量失真。逐渐恶化。然而，随着光学弹片厚度的增加，MTF急剧减小，辐照度逐渐降低，这表明航空光传输效果增强，而航空热辐射效果减弱。成像质量随厚度增加而提高。空气热辐射效应对图像的PSNR的影响比空气光透射效应更严重。