体波声光器件中换能器特征频率的测定

在体波声光器件换能器设计中,往往把它的厚度共振频率f_o作为工作频率。本文通过对换能器的几个特征频率的分析与测定,指出工作频率应选取在它的机械串联共振频率f_3上,并提出了从史密斯圆图上的换能器阻抗与频率的关系曲线上找出f_3的方法。

Determination of characteristic frequency of transducers for bulk wave a-o devices

In the design of transducers for bulk wave a-o devices, the thickness resonance frequency f0 is always taken as working frequency. By analysing and determining several characteristic frequencies for a transducer, it is pointed out that the mechanical resonance frequency f, must be taken as the working frequency, and a method for detemining tfs from the relationship graph on Smith chart between impedance and frequency of a transducer is proposed.