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Large aperture segmented space telescope (LASST): Can we control a 12 000 segment mirror?
KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
2011 (Engelska)Ingår i: Proc Am Control Conf, 2011, s. 438-443Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
2011. s. 438-443
Serie
Proceedings of the American Control Conference, ISSN 0743-1619
Nyckelord [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
Nationell ämneskategori
Reglerteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-150745ISI: 000295376000072Scopus ID: 2-s2.0-80053167710ISBN: 9781457700804 (tryckt)OAI: oai:DiVA.org:kth-150745DiVA, id: diva2:745774
Konferens
2011 American Control Conference, ACC 2011, 29 June 2011 through 1 July 2011, San Francisco, CA
Anmärkning

QC 20140911

Tillgänglig från: 2014-09-11 Skapad: 2014-09-09 Senast uppdaterad: 2016-12-23Bibliografiskt granskad

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