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Large aperture segmented space telescope (LASST): Can we control a 12 000 segment mirror?
KTH, School of Electrical Engineering (EES), Automatic Control.
2011 (English)In: Proc Am Control Conf, 2011, 438-443 p.Conference paper (Refereed)
Abstract [en]

The primary mirror diameter of affordable space telescopes is limited by mass and manufacturing cost. Currently planned optical/near-IR space telescopes use a segmented primary mirror with relatively few segments, and make limited use of real-time position control. However, control can be used as an enabler for a fundamentally different, very highly-segmented architecture, leading to a significant reduction in areal density, and hence a significant increase in the realistically achievable diameter of a space telescope. Small segments can be thinner, and overall mirror stiffness provided by control rather than a back-support structure. However, the resulting control problem involves thousands of actuators and sensors, and many lightly damped modes within the bandwidth. A local control approach similar to that previously developed for large deformable mirrors can provide robust performance for this problem. This is illustrated here for a 30m diameter primary mirror composed of 12 000 0.3m diameter segments. The areal density might be as low as 3-4 kg/m2, nearly an order of magnitude lower than current designs.

Place, publisher, year, edition, pages
2011. 438-443 p.
, Proceedings of the American Control Conference, ISSN 0743-1619
Keyword [en]
Actuators and sensors, Areal densities, Control problems, Large aperture, Large deformable mirrors, Local control, Manufacturing cost, Primary mirrors, Robust performance, Segment mirror, Segmented primary mirrors, Segmented space telescope, Optical telescopes, Space telescopes, Mirrors
National Category
Control Engineering
URN: urn:nbn:se:kth:diva-150745ISI: 000295376000072ScopusID: 2-s2.0-80053167710ISBN: 9781457700804OAI: diva2:745774
2011 American Control Conference, ACC 2011, 29 June 2011 through 1 July 2011, San Francisco, CA

QC 20140911

Available from: 2014-09-11 Created: 2014-09-09 Last updated: 2014-09-11Bibliographically approved

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