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时间反转是一种很有用的自适应聚焦技术。本文中我们进行了声束在固体中运用时间反转方法的自适应聚焦研究。理论分析和实验结果表明时间反转可补偿固体中各声线的程差，从而同时实现纵波和横波的自聚焦。聚焦增益的理论值和实验结果较好地符合。
Time reversal is a useful adaptive focusing technique. In this paper, we performed an adaptive focusing study of the time-reversed method of sound beam in solid. Theoretical analysis and experimental results show that the time reversal can compensate the path difference of each sound ray in the solid, so as to realize the self-focusing of longitudinal and transverse waves at the same time. The theoretical value of the focusing gain is in good agreement with the experimental result.