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Proceedings Paper

Deconvolution of differential OTF (dOTF) to measure high-resolution wavefront structure
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Paper Abstract

Differential OTF uses two images taken with a telescope pupil modification between them to measure the complex field over most of the pupil. If the pupil modification involves a non-negligible region of the pupil, the dOTF field is blurred by convolution with the complex conjugate of the pupil field change. In some cases, the convolution kernel, or difference field, can cause significant blurring. We explore using deconvolution to recover a highresolution measurement of the complex pupil field. In particular, by assuming we know something about the area and nature of the difference field, we can construct a Wiener filter that increases the resolution of the complex pupil field estimate in the presence of noise. By introducing a controllable pupil modification, such as actuating a telescope primary mirror segment in piston-tip-tilt to make the measurement, we explain added features to the difference field which can be used to increase the signal-to-noise ratio for information in arbitrary ranges of spatial frequency. We will present theory and numerical simulations to discuss key features of the difference field which lead to its utility for deconvolution of dOTF measurements.

Paper Details

Date Published: 24 September 2015
PDF: 8 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 960529 (24 September 2015); doi: 10.1117/12.2189575
Show Author Affiliations
Justin M. Knight, The Univ. of Arizona (United States)
Alexander T. Rodack, The Univ. of Arizona (United States)
Johanan L. Codona, The Univ. of Arizona (United States)
Kelsey L. Miller, The Univ. of Arizona (United States)
Olivier Guyon, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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