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在超音速飞行中,红外光学头罩由于空气摩擦而加热,产生红外辐射从而形成热背景,挤占探测器动态范围,降低探测信噪比,严重时会使探测器饱和,丧失探测能力。文中对此进行了分析,并建立了光学头罩热辐射及其影响分析模型,包括光学头罩辐射、辐射传输和探测器响应等部分,可分别计算光学头罩辐射亮度,光线追迹和探测器响应。最后,利用所建立的模型分析了探测器接收的热背景辐射与头罩温度的变化关系以及高速飞行过程中辐射随时间的变化趋势。研究结果可以用于评估高速飞行环境下头罩热辐射对系统性能的影响。
In supersonic flight, the infrared optical hood is heated by air friction to generate infrared radiation to form a hot background, occupying the dynamic range of the detector, reducing the detection signal-to-noise ratio, and in severe cases, saturating the detector and losing its detection capability. The paper analyzes the thermal radiation of the optical hood and its influence analysis model, including the optical hood radiation, the radiation transmission and the detector response and so on. It can calculate the radiation brightness of the optical hood, ray tracing and detection Response. Finally, the relationship between the thermal background radiation received by the detector and the temperature of the hood and the trend of the radiation over time during the high-speed flight are analyzed by using the established model. The results of this study can be used to assess the impact of headgear thermal radiation on system performance under high-speed flight conditions.