脉冲压电换能器的原理和概况

THEORY AND GENERAL DESCRIPTION OF IMPULSE PIEZOELECTRIC TRANSDUCER

清华大学物理系

在地震模型实验中,需要获得几十至几百千赫的、方向性较均匀的窄脉冲声波作为模拟震源。本文论述了作为这种模拟震源的脉冲压电换能器的表面换能原理;利用几种等效电路分析了获取窄脉冲声波的条件;给出了几种换能器的制作材料及其脉冲响应。由上述理论和实验的研究,研制出了具有一定灵敏度、方向性较均匀的窄脉冲压电换能器,初步满足了地震模型实验的要求。

While performing the seismic modelling experiment, it needs to have tens to hundreds of kilohertz and well-distributed orientation-dependent narrow pulse acoustic wave as simulation source. The theory on the superficial function of impulse piezoelectric transducer of the said simulation source is discussed; pre-requisites for obtaining the narrow pulse acoustic wave are examined using a couple of eqiuvalent circuitry; the materials for making the transducers and their pulse response are given. Also, with reference to the researches made on the aforementioned theory and experiments, a transducer with desired sensitivity and well-distributed orientation-dependent narrow pulse piezoelectric transducer is successfully developed. As a consequence, it has basically met the needs of performing the seismic modelling experiment.