摘要
以往在使用KLM等效电路模型进行压电超声换能器的性能分析时,通常忽略电极层的影响以简化计算。但这种处理方法在分析超高频换能器时会带来较大的分析误差。该文以KLM等效电路模型为基础,引入电极层声学特性参数,提出了基于二端口级联网络的计算超声换能器传递函数的方法。并用该方法计算了3种不同材料(PZT-4、PVDF和Y-36°LiNbO3)的超声换能器在不同中心频率下,电极层厚度对压电超声换能器传递函数的影响。结果表明,对于压电材料声阻抗与电极声阻抗相差较大的超声换能器,需要考虑电极层的影响。
The KLM models widely used to analyze piezoelectric ultrasonic transducers often neglect the effect of the electrode. However, this may causes analysis errors for ultra-high frequency transducers. This paper presents the transfer function for an ultrasonic transducer for a two port network based on the traditional KLM model with consideration of the ultrasonic characteristics of the electrode. The effect of the electrode thickness on the transducer characteristics with different center frequencies was studied for three commonly used piezoelectric materials： PZT-4, PVDF and Y-36° LiNbO3. The results show that the effect of the electrode should be considered when there is a large difference between the ultrasonic impedance of the piezoelectric material and the electrode.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第11期1795-1798,1804,共5页
Journal of Tsinghua University(Science and Technology)
基金
深圳市"双百人才"计划资助项目
