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Optical Engineering

Approach for two-dimensional velocity mapping
Author(s): Shaddy Abado; Stanislav Gordeyev; Eric J. Jumper
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Paper Abstract

A method for extracting the convection speed and direction of aberrations present in wavefronts due to aero-optical turbulence over the pupil of a turret on the side of an airborne platform is addressed. The method is applied to data from the Airborne Aero-Optics Laboratory (AAOL). Such convection information is useful in designing feed-forward adaptive-optic approaches. The method makes use of a four-beam Malley probe technique derived by constructing a two-dimensional (2-D) local convective velocity-distribution over the beam's aperture. This technique is based on extending the analysis of the Notre-Dame-developed Malley probe. Two wavefront datasets (Azimuth 157 deg and Elevation 40 deg; Azimuth 42 deg and Elevation 43 deg) from the AAOL are analyzed using the derived method, the first where the laser propagates through fully-separated flow and the second where the laser propagates through an attached-flow region. Finally, the 2-D proper orthogonal decomposition is applied to one in-flight measured dataset to determine the spatial requirements of deformable mirrors in an adaptive-optics system. The paper concludes with a discussion that points out the usefulness of the 2-D velocity-distributions in characterizing the various flow structures which convect over the aperture.

Paper Details

Date Published: 29 November 2012
PDF: 12 pages
Opt. Eng. 52(7) 071402 doi: 10.1117/1.OE.52.7.071402
Published in: Optical Engineering Volume 52, Issue 7
Show Author Affiliations
Shaddy Abado, Univ. of Notre Dame (United States)
Stanislav Gordeyev, Univ. of Notre Dame (United States)
Eric J. Jumper, Univ. of Notre Dame (United States)

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