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Proceedings Paper

Research on dynamic characteristic of optical drive servo system with PLZT
Author(s): Lei Liang; Shaoping Wang; Feng Cao
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Paper Abstract

Traditional electric servo system is disturbed by electromagnetic interference, so optical servo system is needed to build urgently in order to avoid electric signal and electrical wire. Therefore, photostrictive ceramics becomes promising material to realize the optic-signal transmission and photostriction. Lanthanum-modified lead zirconate titanate (PLZT) ceramic is one of the most promising photostrictive materials that can stretch with the light intensity. Because the stretch of PLZT is only about 1μm irradiated by ultraviolet light in unilateralism, this paper adopts the bimorph and amplificatory pole to reach 100μm. The experimental result indicates that PLZT can be used to stretch the tiny displacement with light that dynamic characteristic can meet the requirement of optical drive. Especially, optical servo system used PLZT bimorph as servo valve is illuminated here. A simple on-off control is insufficient to control the optical actuator because the mechanical shutters controlling light irradiation have a large time lag, and the error is more than 0.5μm. A new control method, taking into account the dynamic responses of the PLZT bimorph in order to turn off the shutter or not, is introduced into the system and improves the precision, that is, the system error decreases to 0.1μm.

Paper Details

Date Published: 6 November 2006
PDF: 6 pages
Proc. SPIE 6357, Sixth International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence, 63573T (6 November 2006); doi: 10.1117/12.717262
Show Author Affiliations
Lei Liang, Beihang Univ. (China)
Shaoping Wang, Beihang Univ. (China)
Feng Cao, Beihang Univ. (China)


Published in SPIE Proceedings Vol. 6357:
Sixth International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence
Jiancheng Fang; Zhongyu Wang, Editor(s)

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