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Proceedings Paper

Overcoming hysteresis in multilayered piezoceramic actuators used in adaptive optics
Author(s): Emma Bryce; Erman Uzgur; David Hutson; Katherine Kirk; Mel Strachan; Noah Schwartz; Phil Parr-Burman
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Paper Abstract

Piezoceramic actuators are of increasing interest within the field of adaptive optics through their ability for macro and nano positioning. However, a major drawback for their use is the inherent, non linear hysteresis that is present, which will reduce the accuracy in positioning. Typical (raw) hysteresis for multilayered piezoceramic actuators is 20% of full extension. Methods have been researched to overcome the hysteresis but they often involve complex additions to the actuators and its positioning system. This paper discusses two methods to overcome the hysteresis in a simpler approach. The first method is using capacitance measurements which correlate with the extension of the actuators and reduces hysteresis to 5%. The second method involves measuring the frequency at a specific impedance phase, which can reduce hysteresis to between 0 - 2%. Both methods provide reduction in hysteresis during extension sensing.

Paper Details

Date Published: 28 March 2012
PDF: 9 pages
Proc. SPIE 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012, 83420O (28 March 2012); doi: 10.1117/12.917561
Show Author Affiliations
Emma Bryce, Univ. of the West of Scotland (United Kingdom)
Erman Uzgur, Univ. of the West of Scotland (United Kingdom)
David Hutson, Univ. of the West of Scotland (United Kingdom)
Katherine Kirk, Univ. of the West of Scotland (United Kingdom)
Mel Strachan, Heriot Watt Univ. (United Kingdom)
Noah Schwartz, The Royal Observatory, Edinburgh (United Kingdom)
Phil Parr-Burman, The Royal Observatory, Edinburgh (United Kingdom)


Published in SPIE Proceedings Vol. 8342:
Behavior and Mechanics of Multifunctional Materials and Composites 2012
Nakhiah C. Goulbourne; Zoubeida Ounaies, Editor(s)

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