Real-time full alignment and phasing of multiple-aperture imagers using focal-plane sensors on unresolved objects

S. Vievard; F. Cassaing; L. M. Mugnier; A. Bonnefois; J. Montri

doi:10.1117/12.2312580

6 August 2018 Real-time full alignment and phasing of multiple-aperture imagers using focal-plane sensors on unresolved objects

S. Vievard, F. Cassaing, L. M. Mugnier, A. Bonnefois, J. Montri

Author Affiliations +

Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 106986F (2018) https://doi.org/10.1117/12.2312580
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The alignment of the sub-apertures is a major challenge for future segmented telescopes and telescope arrays. We show here that a focal plane wave-front sensor using only two images can fully and efficiently align a multiple aperture system, both for the alignment (large amplitude tip/tilt aberrations correction) and phasing (piston and small amplitude tip/tilt aberrations correction) modes. We derive a new algorithm for the alignment of the sub-apertures : ELASTICS. We quantify the novel algorithm performance by numerical simulations. We show that the residues are within the capture range of the fine algorithms. We also study the performance of LAPD, a recent real-time algorithm for the phasing of the sub-apertures. The closed-loop alignment of a 6 sub-aperture mirror provides experimental demonstration for both algorithms.

Citation Download Citation

S. Vievard, F. Cassaing, L. M. Mugnier, A. Bonnefois, and J. Montri "Real-time full alignment and phasing of multiple-aperture imagers using focal-plane sensors on unresolved objects", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106986F (6 August 2018); https://doi.org/10.1117/12.2312580

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