STUDY ON THE DUAL-EXCITED FULL-WAVELENGTH PIEZOELECTRIC ULTRASONIC TRANSDUCER
A cascade structure of half-wavelength transducer is proposed for improving power capacity of the transducer, and a dual-excited full-wavelength piezoelectric ultrasonic transducer consisting of two half-wavelength transducers is especially studied. Based on one-dimensional theory, the resonance and the anti-resonance frequency equations of the transducer are derived. The validity of the theoretical analysis is verified by using FEM software. The effect of the locations and volumes of the two piezoelectric ceramic stacks on effective electromechanical coupling factor keff of the transducer is also discussed. The results show that keff drops with both ceramic stacks moved away from the displacement nodes of their respective halfwavelength transducers, and first increases and then decreases with the increase of the volumes of the ceramic stacks. This study is useful for designing and optimizing the dual-excited full-wavelength transducer.
Dual-excited transducer Full-wavelength Resonance frequency Equivalent circuit Electromechanical coupling factor
Zhao-feng LIANG Guang-ping ZHOU Xi-pingMO Zheng-zhong LI
Department of Electronic Engineering, Shenzhen Polytechnic, Shenzhen 518055, China institute of Acou Department of Electronic Engineering, Shenzhen Polytechnic, Shenzhen 518055, China institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
国际会议
深圳
英文
208-212
2011-12-09（万方平台首次上网日期，不代表论文的发表时间）