中文摘要：

介绍了非线性声学及时间反转声学基本原理，综述了国内外非线性声学、时间反转声学以及非线性声学和时间反转声学相结合方法在材料无损检测中应用的研究进展。分析指出，非线性声波对于固定介质中缺陷有很高灵敏度，而时间反转法能实现固体介质中任何一点的声能聚焦。利用非线性声波的缺陷敏感特性和时间反转法的自聚焦特性，实现对缺陷的精确识别和准确定位己成为材料缺陷超声无损检测研究领域的新动向，在工业健康监测、医学诊断、水下通信和地震分析等方面将具有良好的应用前景。

英文摘要：

The basic principles of nonlinear acoustics and time reversal acoustics are briefly introduced and their applications in material NDT are reviewed and discussed. It is pointed out that nonlinear acoustic wave is sensitive to defects in solid media and sonic energy in solid media can be focused on any points by using time reversal acoustics. Identifying and lo eating defects precisely and accurately based on the defect sensitivity of nonlinear acoustic wave and self-focusing characteristics of time reversal acoustic wave has become a new trend in the research field of material NDT and will have a bright application prospect in industrial health monitoring, medical diagnosis, underwater communication and seismic analysis.