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

Jose Maria Rodriguez-Gonzalez; Jesus Jimenez Fuensalida

doi:10.1117/12.457993

4 February 2003 Results of diffraction effects in segmented mirrors: co-phasing with integrated curvature signal

Jose Maria Rodriguez-Gonzalez, Jesus Jimenez Fuensalida

Proceedings Volume 4837, Large Ground-based Telescopes; (2003) https://doi.org/10.1117/12.457993
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Jose Maria Rodriguez-Gonzalez and Jesus Jimenez Fuensalida "Results of diffraction effects in segmented mirrors: co-phasing with integrated curvature signal", Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); https://doi.org/10.1117/12.457993

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