T. Nakada et al., CONTRIBUTION TO OPTICAL ACTUATOR - STUDY ON OPTICAL SERVOSYSTEM, JSME international journal. Series C, dynamics, control, robotics, design and manufacturing, 36(1), 1993, pp. 77-82
This paper deals with a new concept of an optical servosystem and pres
ents an experimental analysis on photostrictive ceramics for use as an
optical actuator in the optical servosystem. The optical servosystem
proposed here is characterized by introduction of an optical actuator
into the system. PLZT ceramics is used as an optical actuator which is
directly driven by light irradiation. The photostrictive effect in th
e PLZT ceramics produced from the superposition of the photovoltaic ef
fect and the piezoelectric effect is experimentally evaluated from the
viewpoint of its applicability to an optical actuator. The experiment
al results show that the PLZT ceramics generates a mechanical strain a
s large as conventional PZT ceramics but at a very slow dynamic respon
se of about 40 seconds. The slow dynamic response is attributed to the
time lag in the photovoltaic effect.