The low-order wavefront control system for the PICTURE-C mission: high-speed image acquisition and processing

Kuravi Hewawasam; Christopher B. Mendillo; Glenn A. Howe; Jason Martel; Susanna C. Finn; Timothy A. Cook; Supriya Chakrabarti

doi:10.1117/12.2274125

1 September 2017 The low-order wavefront control system for the PICTURE-C mission: high-speed image acquisition and processing

Kuravi Hewawasam, Christopher B. Mendillo, Glenn A. Howe, Jason Martel, Susanna C. Finn, Timothy A. Cook, Supriya Chakrabarti

Author Affiliations +

Proceedings Volume 10400, Techniques and Instrumentation for Detection of Exoplanets VIII; 1040020 (2017) https://doi.org/10.1117/12.2274125
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

The Planetary Imaging Concept Testbed Using a Recoverable Experiment - Coronagraph (PICTURE-C) mission will directly image debris disks and exozodiacal dust around nearby stars from a high-altitude balloon using a vector vortex coronagraph. The PICTURE-C low-order wavefront control (LOWC) system will be used to correct time-varying low-order aberrations due to pointing jitter, gravity sag, thermal deformation, and the gondola pendulum motion. We present the hardware and software implementation of the low-order ShackHartmann and reflective Lyot stop sensors. Development of the high-speed image acquisition and processing system is discussed with the emphasis on the reduction of hardware and computational latencies through the use of a real-time operating system and optimized data handling. By characterizing all of the LOWC latencies, we describe techniques to achieve a framerate of 200 Hz with a mean latency of ∼378 μs

Citation Download Citation

Kuravi Hewawasam, Christopher B. Mendillo, Glenn A. Howe, Jason Martel, Susanna C. Finn, Timothy A. Cook, and Supriya Chakrabarti "The low-order wavefront control system for the PICTURE-C mission: high-speed image acquisition and processing", Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 1040020 (1 September 2017); https://doi.org/10.1117/12.2274125

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