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在只考虑目标、背景和红外窗口的情况下，计算了两个很简单的拦截过程中，信噪比和像元电荷数的变化。文中还介绍了国外对非冷却凹进形窗口的研究状况，包括凹进形窗口的气动加热率、气动光学特性。
Taking into account only the target, the background and the infrared window, we calculated the change of the signal-to-noise ratio and the pixel charge number in two very simple interception processes. The paper also introduces the foreign research on the non-cooling concave window, including the aerodynamic heating rate and aerodynamic optical properties of the concave window.