Advanced Astronomy - 14: Speckle Interferometry and Aperture ...
Advanced Astronomy - 14: Speckle Interferometry and Aperture ...
Advanced Astronomy - 14: Speckle Interferometry and Aperture ...
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Summary<br />
ASTR278<br />
Mike Irel<strong>and</strong><br />
Recap<br />
Early Masking<br />
<strong>Speckle</strong><br />
<strong>Interferometry</strong><br />
<strong>Aperture</strong><br />
Masking<br />
Summary<br />
The simplest speckle technique is aperture-masking<br />
with an eyepiece, as used ∼150 years ago.<br />
<strong>Speckle</strong> interferometry takes advantage of the r<strong>and</strong>om<br />
atmospheric phase, by taking many short exposures.<br />
The power spectrum of a target is found by dividing the<br />
observed power spectrum by a power spectrum of a<br />
point source.<br />
<strong>Aperture</strong>-masking is a kind of speckle interferometry<br />
that controls the wavefront by only allowing a<br />
non-redundant set of baselines through. It is still used<br />
behind adaptive optics.
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