Efficient Method for the Reduction of Large Piston Errors in Segmented-Mirror Telescopes

Details Efficient Method for the Reduction of Large Piston Errors in Segmented-Mirror Telescopes Efficient Method for the Reduction of Large Piston Errors in Segmented-Mirror Telescopes

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apopt..43.3279c&link_type=abstract

Applied Optics IP, vol. 43, Issue 16, pp.3279-3286

Physics

Optics

Scientific paper

Phase discontinuity sensing (PDS) is one of two successful approaches to segment phasing that are currently in use at the Keck telescopes, but it has only a limited capture range. We describe and present numerical simulations of a broadband version of the current (narrowband) PDS algorithm that can extend the capture range from 0.4 to 40 µm. Like the original algorithm, the new broadband PDS algorithm requires no special-purpose hardware but only a high-resolution area detector operating in the 2-3-µm range. The potential application of this algorithm to extremely large telescopes is also discussed.

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