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Proceedings Paper

Results of diffraction effects in segmented mirrors: co-phasing with integrated curvature signal
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Paper Abstract

In this paper, we study the ability of a curvature sensor (CS) to measure co-phasing errors in a segmented primary mirror. We study a new fast and low memory-consuming algorithm based on the definition of an integrated curvature signal. This signal results from the integration of the CS response in enclosures matching the shapes of the segments in the mirror. This gives a low number of measurements, equal to the number of segments. The determination of the position of the segments is speeded with an analytical response model, which we formulate in matrix form. In this way, we can make an analysis of the error propagation that is valid for measurement errors or imprecision of the response model. The procedure is well suited to mirrors with a large number of segments, as in the case of ELTs.

Paper Details

Date Published: 4 February 2003
PDF: 12 pages
Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); doi: 10.1117/12.457993
Show Author Affiliations
Jose Maria Rodriguez-Gonzalez, Instituto de Astrofisica de Canarias (Spain)
Jesus Jimenez Fuensalida, Instituto de Astrofisica de Canarias (Spain)


Published in SPIE Proceedings Vol. 4837:
Large Ground-based Telescopes
Jacobus M. Oschmann; Larry M. Stepp, Editor(s)

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