Aperture Masking Imaging
Date
2016
Authors
Ireland, Michael
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Verlag
Abstract
Aperture-mask interferometry has a long history in the speckle regime � in principle equalling the performance of speckle interferometry in the low-flux, zero read-noise regime and offering superior calibration in the bright regime. Since adaptive optics has become commonplace on large telescopes, the key advantage of aperture-mask interferometry is in calibration, particularly of low spatial-frequency phase aberrations that cause quasi-static speckles. I will describe the principles of quasi-static speckle limited imaging in the Fourier plane, where bispectral phase (or Kernel-phase ) and Fourier power are the primary observables, and will show that where Strehl ratios are low or moderate, a non-redundant aperture can offer superior imaging performance. Finally, I will demonstrate the applicability of aperture-masking imaging both to laser-guide star imaging of faint (K????14) star systems and bright transition disc stars (e.g. LkCa?15) surrounded by faint (1000:1 dynamic range) structures.
Description
Keywords
Point Spread Function, Modulation Transfer Function, Binary Star, Adaptive Optic, Fourier Amplitude
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Source
Astrophysics and Space Science Library
Type
Journal article
Book Title
Astronomy at High Angular Resolution
Astronomy at High Angular Resolution
Astronomy at High Angular Resolution
Entity type
Access Statement
Open Access
License Rights
Restricted until
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