Deep learning for space-borne focal-plane wavefront sensing

Maxime Dumont; Carlos Correia; Jean-François Sauvage; Noah Schwartz; Morgan Gray; Olivier Beltramo-Martin; Jaime Cardoso

doi:10.1117/12.2628868

27 August 2022 Deep learning for space-borne focal-plane wavefront sensing

Maxime Dumont, Carlos Correia, Jean-François Sauvage, Noah Schwartz, Morgan Gray, Olivier Beltramo-Martin, Jaime Cardoso

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218034 (2022) https://doi.org/10.1117/12.2628868
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

For space-based Earth Observations and solar system observations, obtaining both high revisit rates (using a constellation of small platforms) and high angular resolution (using large optics and therefore a large platform) is an asset for many applications. Unfortunately, they prevent the occurrence of each other. A deployable satellite concept has been suggested that could grant both assets by producing jointly high revisit rates and high angular resolution of roughly 1 meter on the ground. This concept relies however on the capacity to maintain the phasing of the segments at a sufficient precision (a few tens of nanometers at visible wavelengths), while undergoing strong and dynamic thermal gradients. In the constrained volume environment of a CubeSat, the system must reuse the scientific images to measure the phasing errors. We address in this paper the key issue of focal-plane wave-front sensing for a segmented pupil using a single image with deep learning. We show a first demonstration of measurement on a point source. The neural network is able to identify properly the phase piston-tip-tilt coefficients below the limit of 15nm per petal.

Citation Download Citation

Maxime Dumont, Carlos Correia, Jean-François Sauvage, Noah Schwartz, Morgan Gray, Olivier Beltramo-Martin, and Jaime Cardoso "Deep learning for space-borne focal-plane wavefront sensing", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218034 (27 August 2022); https://doi.org/10.1117/12.2628868

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