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带有红外成像系统的大气层内高速飞行器的头罩窗口外激波的热辐射将降低系统的探测性能。采用单线组模型描述激波的辐射特性。由于激波辐射相对成像系统是近场辐射,建立相应的模型,计算了激波辐射在探测器阵列上产生的光子辐射照度;还计算了激波对目标辐射的吸收特性。得到了如下的计算结果:激波辐射在探测器阵列上产生的背景辐射可以近似为均匀的背景辐射;激波对目标辐射的吸收可以忽略;激波辐射具有强烈的光谱选择性。根据激波的这些辐射性质,在成像系统中通过分别选用不同的带通滤光片,不改变成像系统工作波段的波长宽度,而仅改变其位置,可以减小激波辐射对目标探测的影响,提高探测的信噪比。
Thermal radiation from shockwaves outside the hood window of an in-flight high-speed aircraft with an infrared imaging system will reduce the detection performance of the system. A single-line group model is used to describe the radiation characteristics of a shock wave. Since the relative radiation of shock wave to the imaging system is near-field radiation, a corresponding model is established and the illuminance of photon radiation generated by the shock radiation on the detector array is calculated. The absorption characteristics of shock radiation to the target radiation are also calculated. The calculation results are as follows: The background radiation generated by the shock radiation on the detector array can be approximated as a uniform background radiation; the absorption of the target radiation by the shock wave can be neglected; and the shock radiation has a strong spectral selectivity. According to these radiation properties of the shock wave, the influence of shock radiation on the target detection can be reduced by selecting different band-pass filters respectively in the imaging system without changing the wavelength width of the working wavelength band of the imaging system and only changing the position thereof , Improve the detection of signal to noise ratio.