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Type of Document Dissertation Author Siegenthaler, John Paul Author's Email Address jsiegent@nd.edu URN etd-12182008-135603 Title Guidelines for Adaptive-Optic Correction Based on Aperture Filtration Degree Doctor of Philosophy Department Aerospace and Mechanical Engineering Advisory Committee
Advisor Name Title Michael Lemmon Committee Chair Eric J. Jumper Committee Co-Chair John E. Renaud Committee Member Scott C. Morris Committee Member Stanislav Gordeyev Committee Member Keywords
- Fried Parameter
- Kolmogorov Turbulence
- Wavefront
- Greenwood Frequency
- Adaptive Optics
- Optics
Date of Defense 2008-12-12 Availability unrestricted Abstract Aperture filtration refers to the effects of viewing optical wavefront distortions ofinfinite extent through a finite aperture. If the length-scale of the aberration is larger than
this aperture, then the portion of the aberration visible in the aperture at any moment in
time will not reach the full magnitude of the aberration seen in its entirety. The aperture
acts as a spatial filter, mitigating the effects of large-scale wavefront distortions while
having little effect on smaller-scale aberrations, with the dividing line between large-scale
and small-scale being the size of the aperture itself. This dissertation presents and
charts the development of a set of analytic formulas for judging and predicting the
effectiveness of adaptive-optic corrective systems applied over finite apertures. This
includes some simplified formulas and benchmarks as guides for the minimum
requirements a system will need to meet to be effective, and the maximum degree of
effectiveness such systems can reasonably achieve.
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