Optics equations for aero-optical analysis

George W. Sutton; John E. Pond

doi:10.1117/12.890265

26 July 2011 Optics equations for aero-optical analysis

George W. Sutton, John E. Pond

Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80012A (2011) https://doi.org/10.1117/12.890265
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal

Abstract

Aero-optical effects occur around moving air vehicles and impact passive imaging or active systems. The air flow around the vehicle is compressed, and often there is a turbulent shear and/or boundary layer both of which cause variations in the index of refraction. Examples of these are reconnaissance aircraft, the Stratospheric Observatory for Infrared Optics (SOFIA), and optically homing hypersonic interceptors. In other applications, a laser beam can be formed within the vehicle, and projected outward and focused on an object. These include the Airborne Laser Laboratory, Airborne Laser and the Airborne Tactical Laser. There are many compressible fluid mechanics computer programs that can predict the air density distribution of the surrounding flow field including density fluctuations in turbulent shear and/or boundary layers. It is necessary for the physical optics to be used to predict the properties of the ensuing image plane intensity distribution, whether passive or active. These include the time-averaged image blur circle and instantaneous realizations. (Ray tracing is a poor approximation that gives erroneous results for small aberrations.)

Citation Download Citation

George W. Sutton and John E. Pond "Optics equations for aero-optical analysis", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80012A (26 July 2011); https://doi.org/10.1117/12.890265

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