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Optical Engineering

Subnanometer digital positioning of large bodies by Fabry-Perot interferometry
Author(s): Fabrizio Bertinetto; Enrico Canuto
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Paper Abstract

Abstract. Subnanometer distance stabilization and positioning of large optical structures is a key active control issue for future space telescopes needing picoradian precision. We present solutions and results of a leading experiment, called COSI (control optics structure interaction), aimed at investigating Fabry-Perot cavities as active optical links, capable of stiffening large and massive structures operating in a vacuum. The optical length of each cavity is actuated by a piezoelectric translator (PZT)- driven mechanism and the cavity ensemble is controlled by a model- based digital control unit. The first experiment stabilized the relative tip- tilt motion of two 6.9 kg annular plates, 0.5 m distant. A residual error, lower than 3?-1/2pm(1?), ?> 0.1 s, is achieved in the presence of severe environment noise and artificial micrometer distance variations, thus fully demonstrating the feasibility of the COSI concept and technology. © 2001 Society of Photo-Optical Instrumentation Engineers.

Paper Details

Date Published: 1 January 2001
PDF: 5 pages
Opt. Eng. 40(1) doi: 10.1117/1.1332773
Published in: Optical Engineering Volume 40, Issue 1
Show Author Affiliations
Fabrizio Bertinetto, IMGC - Istituto di Metrologia G. Colonnetti (Italy)
Enrico Canuto, Politecnico di Torino (Italy)


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