热疗用聚焦脉冲声场的时域和频域特性研究

摘要

本文用传递函数的概念导出了凹球面聚焦脉冲声场的简洁表达式，从数值计算上和实验上研究了这种声场中轴线上不同位置处声压信号的持续时间和频谱特征，分析了它们对热疗的影响。%A simple expression of focused impulse sound field generated by concave spherical surface transducers is deduced based on the concept of transfer function. The duration and spectral characteristics of acoustic pressure signal at various sites of the transducer axis in this sound field are studied numerically and experimentally, and its effects on hyperthermia are analyzed.