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Influence of aero-optical transmission on infrared imaging optical system in the supersonic flight

机译：航空声速传输对超音速飞行红外成像光学系统的影响

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Aero-optical transmission effect is becoming a crucial issue in the supersonic flight. In our study, the joint influences of the non-uniform aerodynamic flow field and the aerodynamically heated optical window on imaging quality of an airborne infrared optical system are investigated in depth. Both the laminar and turbulent viscous models are used in the simulation of aerodynamic flow because of their distinct influences on aero-optical transmission. On the basis of the computed density field, the ray tracing method is applied to calculate the point spread functions of the aerodynamic flow field and the aerodynamically heated window. The imaging quality is evaluated by using the point spread functions and modulation transfer functions. Experimental results show that the optical transmission through the aerodynamically heated window has a much severer influence on the imaging quality than that through the aerodynamic flow field. (C) 2014 Elsevier B.V. All rights reserved.
机译：航空光学传输效应正成为超音速飞行中的关键问题。在我们的研究中，深入研究了不均匀的空气动力流场和空气动力加热的光学窗口对机载红外光学系统成像质量的共同影响。层流模型和湍流模型都被用于空气动力学流动的模拟，因为它们对空气光学传递有明显的影响。在计算出的密度场的基础上，采用射线追踪法来计算空气动力流场和空气动力加热窗的点扩散函数。通过使用点扩展函数和调制传递函数来评估成像质量。实验结果表明，与通过空气动力流场相比，通过空气动力加热窗的光学传输对成像质量的影响要大得多。 （C）2014 Elsevier B.V.保留所有权利。

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