Hysteresis correction of a piezoelectrically actuated segmented mirror

Details Hysteresis correction of a piezoelectrically actuated segmented mirror Hysteresis correction of a piezoelectrically actuated segmented mirror

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3353..864c&link_type=abstract

Proc. SPIE Vol. 3353, p. 864-871, Adaptive Optical System Technologies, Domenico Bonaccini; Robert K. Tyson; Eds.

Physics

Scientific paper

ELECTRA is the University of Durham's high order AO system designed for the William Herschel Telescope. The correcting element is a segmented deformable mirror, where each segment is driven by a cylindrical piezoelectric actuator such that it can be moved in tip, tilt and piston. In order to cophase all the segments of the mirror it is necessary to calibrate and linearize the response of these actuators. To this end, we have installed strain gauge transducers along the electrodes of each actuator to provide information on their instantaneous extensions and calibrated their responses.

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