PLZT陶瓷双晶片的能量传输特性分析

研究了掺镧锆钛酸铅(PLZT)具有的光致伸缩效应的机理,理论分析得出光致伸缩是反常光生伏打效应和逆压电效应的叠加.从材料力学角度推导出双晶片执行器在紫外光照射下产生的最大偏移量和最大驱动力.无机械负载时双晶片在光照下产生最大变形,此时双晶片执行器不对外做功,入射光能一部分损失掉,其余转化成电能和机械能,并存储在双晶片执行器中.双晶片执行器做功的大小与外加机械负载有关,当负载为最大驱动力的一半时,输出的机械能最大.以上分析可应用于光执行器的结构设计,使系统获得最大能量输出. 

Energy transmission characteristic of PLZT bimorph

The mechanism of the photostrictive effect of lanthanum-modified lead zirconate titanate(PLZT) ceramics was researched.The theoretical analysis showed that photostriction was the superposition of photovoltaic and converse piezoelectric effects.The maximal deflexion and drive force of PLZT bimorph driver under ultraviolet illumination were attained from material dynamics analysis.PLZT bimorph deflexed to the maxima under irradiation when there was no mechanical load,whereas bimorph did not do work;part of the incident energy was wasted,and the other converted into electrical and mechanical energy and stored in the bimorph driver.The magnitude of work done by bimorph driver related to mechanical load.The exporting mechanical energy reached maximum when the load was half of the maximal drive force.The research can be applied to structural design for optical driver,making the whole system get maximal energy output.