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Proceedings Paper

Numerical analysis of aero-optic effects induced by the turbulence field surrounding hypersonic aicrafts
Author(s): Wenxia Yang; Chao Cai; Mingyue Ding; Chengping Zhou
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Paper 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.

Paper Details

Date Published: 15 November 2007
PDF: 8 pages
Proc. SPIE 6786, MIPPR 2007: Automatic Target Recognition and Image Analysis; and Multispectral Image Acquisition, 67865D (15 November 2007); doi: 10.1117/12.748923
Show Author Affiliations
Wenxia Yang, Huazhong Univ. of Science and Technology (China)
Wuhan Univ. of Technology (China)
Chao Cai, Huazhong Univ. of Science and Technology (China)
Mingyue Ding, Huazhong Univ. of Science and Technology (China)
Chengping Zhou, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 6786:
MIPPR 2007: Automatic Target Recognition and Image Analysis; and Multispectral Image Acquisition

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