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Proceedings Paper

Novel method for aero-optic evaluations
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Paper Abstract

The impact of aerodynamic flow upon the performance of an airborne optical system is becoming a critical issue in the development and engineering of IR electro-optic systems. The analysis of this impact is now in the state of the art of IR electro-optic system research. Significant effort has been made on this issue during recent years. In this work we describe a novel technique for aero-optic calculations. The technique is based on commercially available software. In this work CodeV is the optical ray tracing code and Fluent is the Computational Fluid Dynamics (CFD) code. The synergetic combination between the output of the CFD code and optical software leads to the development of the method. The optically relevant data from the CFD results is transformed into index of refraction field and introduced as an input to the optical code. It is important to note that the data must not necessarily be presented in an analytical form; rather it is introduced in the most general form - as a discrete set of values located at a non-uniform grid of points. The modified quadratic Shepard method has been adopted for the data interpolation. This enables a simple interface with virtually any software output. Such compatibility ensures that the technique can be easily extended for the solution of a whole spectrum of optical problems that involve arbitrary index of refraction changes in the bulk and arbitrary optical surface shapes. For example image quality degradation caused by dome heating can be easily assessed. Both index of refraction changes of the dome and dome shape distortion being taken into account. Several numerical simulations demonstrating the technique are presented.

Paper Details

Date Published: 23 January 2003
PDF: 9 pages
Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); doi: 10.1117/12.451963
Show Author Affiliations
Evgeny Frumker, RAFAEL (Israel)
Offer Pade, RAFAEL (Israel)

Published in SPIE Proceedings Vol. 4820:
Infrared Technology and Applications XXVIII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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