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Torben Anderssen. Profile picture.

Torben Andersen

Professor emeritus (Leave of Absence)

Torben Anderssen. Profile picture.

Integrated modeling of the Euro50

Author

  • Torben Andersen
  • M.T. Browne
  • Anita Enmark
  • Dan Moraru
  • Mette Owner-Petersen
  • Holger Riewaldt

Editor

  • Arne Ardeberg
  • Torben Andersen

Summary, in English

The Euro50 is a proposed 50 m optical and infrared telescope. It will have thousands of control loops to keep the optics aligned under influence of wind, gravity and thermal loads. Cross-disciplinary integrated modeling is used to study the overall performance of the Euro50. A sub-model of the mechanical structure originates from finite element modeling. The optical performance is determined using ray tracing, both non-linear and linearized. The primary mirror segment alignment control system is modeled with the 618 segments taken as rigid bodies. Adaptive optics is included using a layered model of the atmosphere and sub-models of the wavefront sensor, reconstructor and controller. The deformable mirror is, so far, described by a simple influence function and a second order dynamical transfer function but more detailed work is in progress. The model has been implemented using Matlab/Simulink on individual computers but it will shortly be implemented on a Beowulf cluster within a trusted network. Communication routines between Matlab on the cluster processors have been written and are being benchmarked. Representative results from the simulations are shown

Department/s

  • Lund Observatory - Undergoing reorganization

Publishing year

2003

Language

English

Pages

366-378

Publication/Series

Proceedings of the SPIE - The International Society for Optical Engineering

Volume

5382

Issue

1

Document type

Conference paper

Publisher

SPIE

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Euro50 infrared telescope
  • wind load effect
  • thermal load effect
  • control loops
  • gravity effect
  • mechanical structure
  • finite element modeling
  • optical performance
  • primary mirror segment alignment control system
  • ray tracing
  • adaptive optics
  • atmospheric model
  • wavefront sensor
  • MATLAB
  • second order dynamical transfer function
  • deformable mirror
  • Beowulf cluster
  • SIMULINK
  • cluster processor
  • Eur050 optical telescope
  • integrated modeling

Conference name

Second Bäckaskog Workshop on Extremely Large Telescopes, 2003

Conference date

2003-09-09 - 2003-09-11

Conference place

Bäckaskog Castle, Sweden

Status

Published

ISBN/ISSN/Other

  • ISSN: 0277-786X
  • ISSN: 1996-756X