Research on dynamic characteristic of optical drive servo system with PLZT

Lei Liang; Shaoping Wang; Feng Cao

doi:10.1117/12.717262

6 November 2006 Research on dynamic characteristic of optical drive servo system with PLZT

Lei Liang, Shaoping Wang, Feng Cao

Proceedings Volume 6357, Sixth International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence; 63573T (2006) https://doi.org/10.1117/12.717262
Event: Sixth International Symposium on Instrumentation and Control Technology, 2006, Beijing, China

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.

Citation Download Citation

Lei Liang, Shaoping Wang, and Feng Cao "Research on dynamic characteristic of optical drive servo system with PLZT", 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); https://doi.org/10.1117/12.717262

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