A Study on Residual Photovoltage and Photo-Induced Strain in PLZT Ceramic With Coupled Multi-Physics Fields

Abstract

Lead lanthanum zirconate titanate (PLZT) ceramic has draw significant attention for its promising application as a wireless photo-driven micro actuator. However, the residual photovoltage and photo-induced strain have a great influence on the response speed of photostrictive effect and prevent PLZT ceramic from using as a micro actuator, especially in high frequency dynamic field. In this paper, the coupled opto-piezo-thermo-elastic fields in PLZT ceramics were analyzed, based on which the mathematical equations of temperature, voltage and deformation during the light switched off phase were established. After that, the photostrictive static experiments were performed to validate the mathematical equations proposed.

RETRACTED: A Closed-Loop Control Mathematical Model for Photovoltaic-Electrostatic Hybrid Actuator with a Slant Lower Electrode Based on PLZT Ceramic

“…where VS is the saturated photovoltage, τ is the time constant during the illumination phase, and t is the illumination time. When the UV light is turned off at t 0 , the photovoltage in the polarization direction of PLZT ceramic can be expressed as [16]:…”

“…Figure 2. The coupling relationship of opto-electric-thermo-mechanic fields of PLZT ceramic.When the UV light is turned off at t0, the photovoltage in the polarization direction of PLZT ceramic can be expressed as[16]:…”

Closed-loop photovoltage control of lead lanthanum zirconate titanate ceramic for photovoltaic-electrostatic-driven servo system

“…When the UV light is switched off, the temperature of PLZT decreases. According to our previous research, the pyroelectric voltage caused by the shape decreasing temperature can be written as (Huang et al, 2015a)…”

Mathematical model and characteristic analysis of hybrid photovoltaic/piezoelectric actuation mechanism

“…In the meantime, the light energy also heats up the actuator, and accordingly the body temperature of the PLZT rises. According to the thermal energy balance principle, the additional voltage generated owing to the pyroelectric effect can be deduced as [14] ò ò…”

“…Because of its advantages of non-contact optical control and lower susceptibility to electric/magnetic disturbances, PLZT wafers were used as distributed actuators in the study of photonic vibration control of flexible shells [7][8][9][10][11][12]. However, there are some demerits of PLZT in photostrictive actuation, such as one-way actuation, the hysteresis phenomenon between the photovoltage and the photodeformation, slow response of the photodeformation and the serious residual voltage and strain after turning off the light [13][14][15]. In order to remedy these defects of PLZT as an actuator, a hybrid photovoltaic/piezoelectric actuation mechanism was proposed and studied, in which the light-driven photovoltaic generatorinduced voltage was used to drive the piezoelectric actuator Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.…”