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Theoretical and experimental analysis of an optical driven servo system

An optical driven servo system model based on single-type PLZT ceramic is proposed in this paper. The control equation of the proposed servo system is derived based on the mathematical model of PLZT with coupled multi-physics fields. The parameters of photodeformation of the PLZT actuator during both the illumination phase and light off phase are identified through the static experiment. Then displacement response of optical driven servo system is numerically simulated based on the control equation presented in this paper. After that, the closed-loop control experiment of optical driven servo system based on PLZT single-type ceramic with a simple on–off method is carried out. The experimental results show that the optical driven servo system with simple on–off method can achieve the target displacement by applying UV light to the PLZT actuator. Furthermore, an improved on–off control strategy is proposed to decrease the undesirable fluctuation around the target displacement.