Segment-level thermal sensitivity analysis for exo-Earth imaging

Ananya Sahoo; Iva Laginja; Laurent Pueyo; Rémi Soummer; Laura E. Coyle; J. Scott Knight; Matthew East

doi:10.1117/12.2630592

27 August 2022 Segment-level thermal sensitivity analysis for exo-Earth imaging

Ananya Sahoo, Iva Laginja, Laurent Pueyo, Rémi Soummer, Laura E. Coyle, J. Scott Knight, Matthew East

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 121805V (2022) https://doi.org/10.1117/12.2630592
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We present a segment-level wavefront stability error budget for space telescopes essential for exoplanet detection. We use a detailed finite element model to relate the temperature gradient at the location of the primary mirror to wavefront variations on each of the segment. We apply the PASTIS sensitivity model forward approach to allocate static tolerances in physical units for each segment, and transfer these tolerances to the temporal domain via a model of the WFS&C architecture in combination with a Zernike phase sensor and science camera. We finally estimate the close-loop variance and limiting contrast for the segments’ thermo-mechanical modes.

Citation Download Citation

Ananya Sahoo, Iva Laginja, Laurent Pueyo, Rémi Soummer, Laura E. Coyle, J. Scott Knight, and Matthew East "Segment-level thermal sensitivity analysis for exo-Earth imaging", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 121805V (27 August 2022); https://doi.org/10.1117/12.2630592

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