Rolling shutter detector data flow strategies to push the limits of AO performance

Markus Dirnberger; Francois Rigaut; Yosuke Minowa; Rodolphe Conan; Olivier Guyon; Damien Gratadour; Visa Korkiakoski

doi:10.1117/12.2311901

17 July 2018 Rolling shutter detector data flow strategies to push the limits of AO performance

Markus Dirnberger, Francois Rigaut, Yosuke Minowa, Rodolphe Conan, Olivier Guyon, Damien Gratadour, Visa Korkiakoski

Proceedings Volume 10703, Adaptive Optics Systems VI; 107034O (2018) https://doi.org/10.1117/12.2311901
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Adaptive Optics (AO) improves the image quality of ground-based telescopes, by compensating in real-time for the blurring eﬀects of atmospheric turbulence. AO systems of future Extremely Large Telescopes (ELTs) will have to operate at much bigger scales (in terms of degrees of freedom) and faster control rates (in terms of loop frequency) to realise their full potential. We have investigated and simulated an AO control methodology to stream pixels “as they come” using a rolling-shutter sCMOS camera to reconstruct 2D images. Compared to a traditional global shutter implementation, the initial results indicate the rolling shutter can reduce control loop latency by a factor of two to four, using existing hardware. This means we can detect twice the number of photons while sampling twice as slowly. Nevertheless, significant technical challenges remain in implementing the rolling functionality, especially when integrating oﬀ-the-shelf software and hardware, which is often constricted by a closed-source code base. Furthermore, as the rolling shutter readout is asynchronous, questions remain about coupling and aliasing of telescope vibrations into the imaging system, causing distortions of time and space. If successfully implemented in practice, the rolling shutter approach has the potential to allow astronomers and engineers to capture better scientific observations closer to the diﬀraction limit.

Citation Download Citation

Markus Dirnberger, Francois Rigaut, Yosuke Minowa, Rodolphe Conan, Olivier Guyon, Damien Gratadour, and Visa Korkiakoski "Rolling shutter detector data flow strategies to push the limits of AO performance", Proc. SPIE 10703, Adaptive Optics Systems VI, 107034O (17 July 2018); https://doi.org/10.1117/12.2311901

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KEYWORDS

Camera shutters

Cameras

Adaptive optics

Sensors

Frame grabbers

Control systems

Space telescopes

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