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气动热环境下光学头罩由于受气动热效应作用,其形状和光学性质都将发生改变,从而影响头罩内的光传输。建立气动光学头罩有限元分析模型,根据热光效应和弹光效应理论,对头罩的折射率场进行数值计算,采用四阶龙格-库塔法编制光线追迹程序对气动光学头罩内红外辐射光线传输进行了数值仿真,得到了头罩光学系统出射波面波像差和调制传递函数。研究结果表明:气动热环境下热光效应对光学头罩光传输的影响远比弹光效应大,且气动光学头罩成像质量受到气动热效应的影响严重下降,为了提高高速飞行器的制导精度,不能忽视气动热对头罩光传输的影响。
Due to the aerodynamic thermal effect of the optical hood under aerodynamic thermal environment, its shape and optical properties will change, thus affecting the light transmission in the hood. The finite element analysis model of aerodynamic optical hood is established. According to the theory of thermo-optic effect and the mere effect of light-induced effect, the refractive index field of the hood is numerically calculated. The fourth-order Runge- Infrared radiation transmission was simulated numerically, and the output wavefront aberration and modulation transfer function of the headlight optical system were obtained. The results show that the effect of thermo-optic effect on the optical transmission of the optical headlight is much greater than that of the fly-eye effect under the aerodynamic thermal environment, and the image quality of the aerodynamic optical hood is seriously affected by the aerodynamic thermal effect. In order to improve the guidance accuracy of the high-speed aircraft, Ignoring the impact of aerodynamic heat on the headlight transmission.