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Proceedings Paper

Potential of phase-diversity for metrology of active instruments
Author(s): Visa Korkiakoski; Lars Venema; Tibor Agocs; Christoph U. Keller; Niek Doelman; Rufus Fraanje; Raluca Andrei; Michel Verhaegen
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Paper Abstract

We investigate the potential of phase-diversity (PD) and Gerchberg-Saxton (GS) algorithms in the calibration of active instruments. A set of images is recorded with the focal-plane scientific camera, each image having a known and unique defocus. The phase-retrieval algorithms are used, with those images, to estimate the non-common path aberration that needs to be compensated by correct alignment of the instrument. We demonstrate by numerical simulations that such algorithms, in particular GS, are sufficient detection methods to fully correct wavefronts with an rms error at least up to 6 rad — but this requires several iterative correction stages.

Paper Details

Date Published: 13 September 2012
PDF: 11 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84505D (13 September 2012); doi: 10.1117/12.926290
Show Author Affiliations
Visa Korkiakoski, Leiden Observatory (Netherlands)
Lars Venema, ASTRON (Netherlands)
Tibor Agocs, ASTRON (Netherlands)
Christoph U. Keller, Leiden Observatory (Netherlands)
Niek Doelman, TNO (Netherlands)
Rufus Fraanje, Delft Ctr. for Systems and Control (Netherlands)
Raluca Andrei, Delft Ctr. for Systems and Control (Netherlands)
Michel Verhaegen, Delft Ctr. for Systems and Control (Netherlands)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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