A Mach-Zehnder phasing sensor for extremely large segmented telescopes: laboratory results and close-loop algorithm

Natalia Yaitskova; Luzma Montoya-Martinez; Kjetil Dohlen; Philippe Dierickx

doi:10.1117/12.548940

28 September 2004 A Mach-Zehnder phasing sensor for extremely large segmented telescopes: laboratory results and close-loop algorithm

Natalia Yaitskova, Luzma Montoya-Martinez, Kjetil Dohlen, Philippe Dierickx

Author Affiliations +

Proceedings Volume 5489, Ground-based Telescopes; (2004) https://doi.org/10.1117/12.548940
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

Alignment of the segmented telescopes requires an accurate phase measurement at the segment borders using an optical sensor. We develop such a sensor based on the Mach-Zehnder interferometer. The operation of this system was previously demonstrated in computer simulation and through the detailed theoretical analysis. In this paper we show the results of the laboratory experiment, which confirms the main predictions we have made. The close loop control for optical phasing of segmented mirrors, analogous to the one with the use of the edge sensors, is also described and illustrated.

Citation Download Citation

Natalia Yaitskova, Luzma Montoya-Martinez, Kjetil Dohlen, and Philippe Dierickx "A Mach-Zehnder phasing sensor for extremely large segmented telescopes: laboratory results and close-loop algorithm", Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); https://doi.org/10.1117/12.548940

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