摘要
在固体测量中，横波换能器所产生的波列中常伴随有纵波．认识纵波产生的原因可以解释横被测试中出现的现象，以及为抑制纵被提供有效的方法．本文利用实验研究的方法，用一对纵波偶极子换能器作对比实验，分析了2－2型压电复合材料厚度切变模换能器产生纵波的机理．发现这是一种伴随着晶片厚度切变振动而产生的“偶极子”纵波，并由此解释了这种纵波的伴随性、频率特性及其首波与横波首波位相相反等问题．
In solid, a trasverse transducer motivates a waveform ofen containing a pwave. Analysis of how the p-wave is produced can help to interpret some phenomena in measurements and provide effective means to restrain the p-wave. In this paper, by comparing with the wave forms actuated by a pair of dipole transducers, the characteristics of the p-wave produced by a 2-2 piezocomposite transducer vibrating in the thickness shear mode are experimentally investigated. It is discovered that the p-waves are n diPole' waves which accompany the vibrations of a thickness shear piezoelectric plate. There-after, the accompanying and frequency characteristics of the p-waves l and the antiphase between the respective first circle of the p-wave and S-wave are interpreted in terms of the 'dipole' nature of the p-waves.
出处
《应用声学》
CSCD
1996年第4期10-15,共6页
Journal of Applied Acoustics
基金
国家自然科学基金
关键词
复合材料
横波换能器
换能器
纵波
压电介质
2-2 piezocomposites, Transverse transducers, Accompanying p-waves
