Tilt corrector based on spring-type magnetostrictive actuators

Details Tilt corrector based on spring-type magnetostrictive actuators Tilt corrector based on spring-type magnetostrictive actuators

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993opten..32..447a&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 32, no. 3, p. 447-452.

Physics

Optics

Actuators, Adaptive Optics, Positioning, Magnetostriction, Precision, Springs (Elastic), Strain Distribution, Wave Fronts

Scientific paper

Tilt corrector based on a spring-type magnetostrictive actuator (STMA) was investigated for wavefront tilt correction. The STMA is a very efficient type of macroactuator for application in large ground- and spacebased adaptive optics. By means of the STMA it is possible to deliver, in a real-time scale (1 to 10 ms), precision displacements in a range up to 100 microns with a 0.1-micron positioning accuracy. On the basis of experimentally investigated static and dynamic characteristics of STMAs the real-time two-coordinate mirror positioning system for precise optical engineering was developed and investigated. A dynamic range of corrected tilts up to 8 arc min with a frequency range up to 50 Hz delivered by the developed tilt corrector allowed compensation for natural thermoconvectionally induced tilts with accuracy of 0.1 arcsec.

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