]布鲁塞尔大学课件振动控制.pdf

Introduction 1 Principle of Active Optics for a monolithic M1 (ESO‐NTT‐1989) BackBack ofof M1M1 ofof thethe NTTNTT Controller Controller 2 Space telescopes M1 of existing and future  JWST – 6.5m Optical telescopes HST – 2.6m Herschel – 3.5m (2013 ?) Ground based telescopes E‐ELT – 42m (2017 ?) TMT – 30m (2018 ?) Keck – 10m VLT – 8m 3 E‐ELT primary mirror [ESO‐2018?] 984 segments OOne segmentt: 66 EdgeEdge sensorssensors 33 PositionPosition actuatorsactuators (two stages) 4 Truss‐supported segmented mirror Quasi‐static response: y = J a Dynamic (assuming the truss is infinitely rigid) uncertaint