Torben Andersen
Professor emeritus (Leave of Absence)
Suppressing low-order eigenmodes with local control for deformable mirrors
Author
Summary, in English
To improve the mechanical characteristics of actively controlled continuous faceplate deformable mirrors in adaptive optics, a strategy for reducing crosstalk between adjacent actuators and for suppressing low-order eigenmodes is proposed. The strategy can be seen as extending Saint-Venant's principle beyond the static case, for small local families of actuators. An analytic model is presented, from which we show the feasibility of the local control. Also, we demonstrate how eigenmodes and eigenfrequencies are affected by mirror parameters, such as thickness, diameter, Young's modulus, Poisson's ratio, and density. This analysis is used to evaluate the design strategy for a large deformable mirror, and how many actuators are needed within a family. (c) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.2.026601]
Department/s
- Lund Observatory - Undergoing reorganization
Publishing year
2012
Language
English
Publication/Series
Optical Engineering
Volume
51
Issue
2
Full text
Document type
Journal article
Publisher
SPIE
Topic
- Astronomy, Astrophysics and Cosmology
Keywords
- distributed control
- adaptive optics
- large deformable mirror
- dimensionless mode analysis
Status
Published
ISBN/ISSN/Other
- ISSN: 0091-3286