Numerical analysis of aero-optic effects induced by the turbulence field surrounding hypersonic aicrafts

Wenxia Yang; Chao Cai; Mingyue Ding; Chengping Zhou

doi:10.1117/12.748923

15 November 2007 Numerical analysis of the aero-optic effects induced by the turbulence field surrounding hypersonic aircrafts

Wenxia Yang, Chao Cai, Mingyue Ding, Chengping Zhou

Author Affiliations +

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.

Citation Download Citation

Wenxia Yang, Chao Cai, Mingyue Ding, and 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); https://doi.org/10.1117/12.748923

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