Phasing a sparse telescope

Erez N. Ribak; B. M. Levine; E. Behar

doi:10.1117/12.2559444

13 December 2020 Phasing a sparse telescope

Erez N. Ribak, B. M. Levine, E. Behar

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 1144342 (2020) https://doi.org/10.1117/12.2559444
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We designed and built a laboratory model of a sparse space telescope. The purpose of the model is to test various algorithmic, optical, and mechanical issues with such a telescope: how to achieve alignment after deployment that yields diffraction limited optical performance. Our model uses four non-redundant sparse sectors. Each segment has three degrees of freedom, with supplementary coarse focusing, so the search volume for a perfect image is quite large, ~10⁵¹. We tried stochastic searches, optimizing the point spread to its minimum, and are now testing different directed search algorithms, of volume order 10¹⁹ or less. This will cut the search time from one day to about one hour, with much less chance of actuator failure.

Citation Download Citation

Erez N. Ribak, B. M. Levine, and E. Behar "Phasing a sparse telescope", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 1144342 (13 December 2020); https://doi.org/10.1117/12.2559444

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