论文部分内容阅读
本文基于多振动模式滤波器的综合理论,提出了一种适用于高效率、宽频带压电换能器设计的方法。这种方法保持物理直观性,并通过迭代运算得到匹配层最优值。为了说明设计方法,设计了一个空气背衬、三个声匹配层的换能器。理论与实践符合很好。这个换能器的6-dB相对带宽为88％。双程插入损失为3.2dB。通带内波动小于1dB。进一步设计制做了具有三个声匹配层的线性探头阵列样机,并用在一台超声诊断设备中,获得了高分辨率的超声图象。
Based on the theory of multi-vibration mode filter, a method suitable for the design of high-efficiency and wide-band piezoelectric transducers is proposed in this paper. This method maintains the physical intuition and obtains the optimal value of the matching layer by iterative operation. To illustrate the design method, a transducer with an air backing and three acoustic matching layers was designed. Theory and practice in good agreement. The 6-dB relative bandwidth of this transducer is 88%. Two-way insertion loss of 3.2dB. The passband fluctuation is less than 1dB. A linear probe array prototype with three acoustic matching layers was further designed and used in an ultrasound diagnostic equipment to obtain high resolution ultrasound images.