Efficient method for the reduction of large piston errors in segmented-mirror telescopes

Gary A. Chanan; Agusti Pinto

doi:10.1117/12.566269

7 July 2004 Efficient method for the reduction of large piston errors in segmented-mirror telescopes

Gary A. Chanan, Agusti Pinto

Proceedings Volume 5382, Second Backaskog Workshop on Extremely Large Telescopes; (2004) https://doi.org/10.1117/12.566269
Event: Second Backaskog Workshop on Extremely Large Telescopes, 2003, Backaskog, Sweden

Abstract

Phase Discontinuity Sensing (PDS) is one of two successful approaches to segment phasing currently in use at the Keck telescopes, but it has only very limited capture range. In this work, we describe and present numerical simulations of a broadband version of the current (narrowband) PDS algorithm which can extend the capture range from 0.4 μm to 40 μm. Like the original algorithm, the new broadband PDS algorithm (BPDS) does not require any special-purpose hardware, 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.

Citation Download Citation

Gary A. Chanan and Agusti Pinto "Efficient method for the reduction of large piston errors in segmented-mirror telescopes", Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); https://doi.org/10.1117/12.566269

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