高超声速飞行器红外成像系统热辐射评估模型

Thermal Radiation Evaluation Model for Infrared Imaging System in Hypersonic Vehicles

高超声速飞行器的红外窗口飞行时在气动加热作用下温度急剧上升,从而产生强烈的背景辐射,影响探测系统的成像质量。为了准确评估气动热效应对成像系统所产生的影响,利用蒙特卡罗方法和射线追踪方法结合的方式,分析了由于温度升高所产生的窗口辐射以及所造成的窗口透射能力的降低。据此还提出了一种提高成像信噪比的方法,使得成像信噪比在理想条件下平均提高11.2。

The infrared windows of hypersonic vehicles encounter a rapid increase in temperature due to the aerodynamic heating effect during flight,resulting in intense background radiation that affects the imaging quality of the detection system.To precisely assess the effects of aerodynamic heating on the infrared imaging system,a combined approach of the Monte-Carlo method and ray tracing method is developed and employed to analyze the background radiation and the decrease in transmission of the infrared window caused by temperature rise.Accordingly,a method to improve the signal-to-noise ratio of the imaging system is proposed,resulting in an average improvement of 11.2 in the signal-to-noise ratio under ideal conditions.