细光束在钝锥体外流场中的追迹

Ray tracing in outer fluid field of blunted cone flyer

飞行的钝锥体外流场在密度分布上具有强烈非均匀性,这将导致其传输的细光束在远场靶面上产生偏移,从而影响其光学探测系统的作用精度。探讨并给出了任意折射率分布介质中的光线追迹方法。利用该方法对钝锥体外流场中的细光束路径进行了计算。计算结果表明:在所选位置上,锥体外流场对光线的出射角有明显的影响,但不是特别剧烈;当钝锥体表面加冷却源后,流场密度梯度变化加大,光束出射角的脱靶量明显加大。校正外流场为分析钝锥体上光学系统引入的目标脱靶量提供参考依据。

Since the density distribution of the outer flow field of a blunted cone flyer is inhomogeneous, the beamlet deflection in the far-field target surface occurs and the detection accuracy of the optical device mounted on the flyer is affected. A method of ray tracing in inhomogeneous medium was investigated for tracing a slim laser beam in the steady outer flow field of the blunted flyer in high speed movement. The beamlet path in the outer flow field of a blunted flyer was calculated. The result shows that in the chosen location, the effect of the outer flow field of a blunted flyer on the exit angle of the beam is observable, but not dramatic the variation of flow field density gradient and the beam deflection of the beam exit angle increase when a cooling source is applied on the surface of the blunted flyer. The result provides a reference for correcting the beam deflection of the optical system mounted on blunted flyer caused by outer fluid field.