Tomographic phase diversity for non-common path ... - AO4ELT 2
Tomographic phase diversity for non-common path ... - AO4ELT 2
Tomographic phase diversity for non-common path ... - AO4ELT 2
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Two new ideas (as far as I know ?)<br />
<strong>Tomographic</strong> <strong>phase</strong> <strong>diversity</strong>:<br />
The classical PD approach can be extended to process data over<br />
an extended field of view.<br />
Instead of solving <strong>for</strong> a 2D <strong>phase</strong>, solve <strong>for</strong> a 3D <strong>phase</strong> (discrete<br />
or continuous). E.g 2-3 <strong>phase</strong> planes + a tomographic projector<br />
Naturally more overconstrained/robust than PD in individual<br />
direction + tomographic reconstruction (assuming # of field<br />
positions/images is larger than the # of <strong>phase</strong> planes).<br />
The PD minimisation criterion can be expressed in the<br />
Fourier plane (OTF-based <strong>phase</strong> <strong>diversity</strong>)<br />
(Potentially) saves one Fourier trans<strong>for</strong>m<br />
Allow weighting per spatial frequencies<br />
✚ I will present 2 packages developed by D.Gratadour<br />
(PRAy, image based) and F.Rigaut (OPRA, OTF-based)<br />
OSA, AO Session, Toronto, July 10-14, 2011<br />
Wednesday, 28 September 11<br />
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