James Nagy (Emory University), Stuart Jefferies (University of Hawaii), Michael Hart (University of Arizona), Douglas Hope (US Air Force Academy)
Keywords: Tomography, wavefront reconstruction, micro-lens imagery
Abstract:
We show that data acquired using a micro-lens array to form multiple images of the full field-of-view of an astronomical target can be used to reconstruct the 3-D wave front for the observations. This opens the door for both a beacon-less wave front sensor and imaging of fields-of-view substantially larger than the isoplanatic angle. The reconstruction problem can be modeled as a large-scale linear inverse problem, but standard algorithms used for 3-D computed tomography (CT) reconstruction cannot be applied because measured data are only taken from limited angular range, leaving entire regions of the frequency space un-sampled. However, we show that there is substantial structure in the mathematical model that can be exploited to obtain a robust algorithm that is amenable to efficient parallel implementations.
Date of Conference: September 9-12, 2014
Track: Poster