非线性声学的进展与应用

文章介绍了非线性声学的发展过程及其近年来在有关领域中新的进展和应用,着重从以下四方面对非线性参数的测量和非线性声学的应用作了详述:(1)非线性参数B/A的特征及其测量方法。除了介绍传统的测量方法外,也简要介绍了近几年来出现的新方法。另外,对固体非线性系数的测量也作了简介;(2)无损评价。它是非线性声学最有潜力的应用,因为材料的缺陷是与强的非线性特性紧密相连;(3)掩埋物探测。它是基于土壤/掩埋雷构成的耦合系统,类似于多孔材料或NME材料的非线性声学特性;(4)医学谐波成像。介绍了三种成像(造影剂成像,组织谐波成像及反射回波成像)的机理与特点。

Progression and application of the nonlinear acoustics

New progress and application of nonlinear acoustics in recent years were reviewed,and four aspects were emphasized:(1) nonlinear parameter B/A determination: besides conventional methods,the new methods for the determination were introduced in belief,also the measurements of the solid nonlinear coefficient.(2) nondestructive evaluation: this is the most potential application of nonlinear acoustics,because the fatigue of material is closely related to high nonlinear acoustic behaviors.(3) buried target detection: this is based on the soil/mine coupled system,and similar to the nonlinear acoustic characteristics of the porous/NME material.(4) medical harmonic imaging: three types of imaging(UCAI,THI and EHI) and their mechanism were described.