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12 July 2019 Active correction system of a deployable telescope for Earth observation
Dennis Dolkens, Gijsbert Van Marrewijk, Hans Kuiper
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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111800A (2019) https://doi.org/10.1117/12.2535929
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece
Abstract
Deployable optics can bring major cost reductions to the field of Earth Observation. One of the key challenges in the development of a deployable optical system, however, is making sure that it can meet its performance targets following its deployment. In this paper, a novel active correction system for a deployable telescope is described. The correction system co-aligns and phases the primary mirror segments and subsequently corrects remaining aberrations using a deformable mirror. A novel phasing sensor called PistonCam can bring telescope segments into phase while the telescope is staring at extended scenes. By only sampling segment boundaries, PistonCam is able to isolate piston and tip/tilt errors which allows the errors to be corrected more effectively. After phasing process has been completed, a moving scene sharpness optimization technique is used to correct the remaining aberrations with a deformable mirror, The technique does not require a constant scene, unlike existing sharpness optimization techniques. As such, the telescope does not need to track a ground scene during the correction process. The technique can also be used for continuous correction of telescope deformations. The active optics system offers robust aberration correction, is computationally inexpensive and requires limited additional optical hardware.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Dennis Dolkens, Gijsbert Van Marrewijk, and Hans Kuiper "Active correction system of a deployable telescope for Earth observation", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111800A (12 July 2019); https://doi.org/10.1117/12.2535929
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KEYWORDS
Telescopes
Mirrors
Image segmentation
Deformable mirrors
Sensors
Calibration
Wavefronts
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