Nicholson N C, McDicken W N
Department of Medical Physics and Medical Engineering, Royal Infirmary, Edinburgh, UK.
Ultrasonics. 1991 Mar;29(2):133-7. doi: 10.1016/0041-624x(91)90042-7.
The attenuation of wave modes of ultrasound propagating in a number of different diameter stainless steel wires (in the range 0.25-1.21 mm) has been found experimentally. Most modes display an attenuation minimum at certain frequencies. The varying behaviour of mode attenuation with frequency, which is called selective attenuation, is due, in part, to changing proportions of the different types of wave motion that constitute a mode. Selective attenuation is discussed in the light of two theoretical models. One model, which considers the waveguide medium as being viscoelastic in nature, is shown qualitatively to be in reasonable agreement with experimental results but nevertheless leaves a number of questions unanswered.
通过实验发现了超声在多种不同直径（范围为0.25 - 1.21毫米）的不锈钢丝中传播时波模的衰减情况。大多数波模在特定频率处呈现出最小衰减。模式衰减随频率的变化行为，即所谓的选择性衰减，部分原因是构成一个模式的不同类型波动的比例发生了变化。根据两种理论模型对选择性衰减进行了讨论。一种模型将波导介质视为本质上具有粘弹性，定性地显示出与实验结果合理相符，但仍留下一些未解决的问题。
