2-6 September 2013
STIAS Conference Centre
Africa/Johannesburg timezone

Wide field wavefront sensing on extended scenes and possible applications

4 Sep 2013, 14:00
STIAS Conference Centre

STIAS Conference Centre

Stellenbosch Institute for Advanced Study Wallenberg Research Centre 10 Marais Road Stellenbosch South Africa www.stias.ac.za
Poster Presentation


Dr Roberto Ragazzoni (INAF - Astronomical Observatory of Padova - Italy)

Abstract content <br>(Max 300 words)<br><a href="http://indico.saip.org.za/getFile.py/access?resId=0&materialId=2&confId=28" target="_blank">Special Chars</a>

Multi Conjugated or Multi Object (that translates into Multi Zonal in several possible industrial and medical applications) Adaptive Optics requires wavefront sensing over an extended scenes for complex objects that span much more than the isoplanatic patch. Whenever the scenery is complex the number of pixel requested for a Shack-Hartmann like application (or whenever the wavefront sensor detects on the focal plane) can easily approach untreatable figures. I propose to use a pupil plane wavefront sensing in which an intermediate filter is located in the focal plane and that has to be adjusted by the singal collected by an auxiliary detector looking through the whole aperture to the scene and hence conjugated to the focal plane while the gain of the signal per each subaperture will be given by a tip-tilt modulation introduced artificially in the wavefront sensing channel.
This approach takes, to some extent, advantage from the sharpening of the image and can handle a slowly changing scenery.
The possible applications of this approach to medical and strategic imaging are briefly reviewed.

Primary author

Dr Roberto Ragazzoni (INAF - Astronomical Observatory of Padova - Italy)

Presentation Materials

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