AAOL wavefront data reduction approaches

Shaddy Abado; Stanislav Gordeyev; Eric Jumper

doi:10.1117/12.922838

15 May 2012 AAOL wavefront data reduction approaches

Shaddy Abado, Stanislav Gordeyev, Eric Jumper

Proceedings Volume 8395, Acquisition, Tracking, Pointing, and Laser Systems Technologies XXVI; 83950A (2012) https://doi.org/10.1117/12.922838
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

This paper addresses 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. 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 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° and Elevation 40°; Azimuth 42° and Elevation 43°) 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 two-dimensional 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 two-dimensional velocity-distributions in characterizing the various flow structures which convect over the aperture.

Citation Download Citation

Shaddy Abado, Stanislav Gordeyev, and Eric Jumper "AAOL wavefront data reduction approaches", Proc. SPIE 8395, Acquisition, Tracking, Pointing, and Laser Systems Technologies XXVI, 83950A (15 May 2012); https://doi.org/10.1117/12.922838

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