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