15 November 2007 Numerical analysis of the aero-optic effects induced by the turbulence field surrounding hypersonic aircrafts
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Proceedings Volume 6786, MIPPR 2007: Automatic Target Recognition and Image Analysis; and Multispectral Image Acquisition; 67865D (2007) https://doi.org/10.1117/12.748923
Event: International Symposium on Multispectral Image Processing and Pattern Recognition, 2007, Wuhan, China
Abstract
The goal of this paper is to numerically simulate and analyze the aero-optic effects caused by the hyper-speed turbulence fields surrounding the aircraft under different flight conditions, and to characterize them with the associated optical transfer functions. First, analysis and computation of the aero-optic effects under different flight conditions have been addressed, where the parameters characterizing the hyper-speed turbulence field were obtained by solving its N-S equations via CFD methods. The infrared ray trajectories passing through the flow field with a non-homogeneous distribution of the refraction indices were acquired using the gradient index ray-tracing method, and the transfer function to represent the aero-optic effects was derived considering the principles of Fourier optics. The simulation results showed that the aero-optic transfer function is characterized as a low-pass filter of nonlinearly varying phases, which results the blurring and shifting of the objects in the acquired images.
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Wenxia Yang, Chao Cai, Mingyue Ding, Chengping Zhou, "Numerical analysis of the aero-optic effects induced by the turbulence field surrounding hypersonic aircrafts", Proc. SPIE 6786, MIPPR 2007: Automatic Target Recognition and Image Analysis; and Multispectral Image Acquisition, 67865D (15 November 2007); doi: 10.1117/12.748923; https://doi.org/10.1117/12.748923
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