通过提取分层介质声回波的相频特征信息,对物理性质未知的分层材料实现了有效的分类识别.分类对象为单层材料、包含两种不同声速和密度的两种双层材料、外层较硬中间较软的三层结构,硬和软是指两种材料ρc值的相对大小.数值模拟表明该方法对4种分层结构能进行有效识别.采用优化的分类流程可减小测量的工作量.%This paper presents a method for classification of layered materials with unknown physical properties based on the phase-frequency characteristics of acoustic reflection coefficients.Layered structures under consideration include a single layer material,double-layered plates with harder and softer materials on the two sides respectively,and a sandwich structure with a harder material as the outer layers and a softer material in the middle.A set of criteria for differentiating the types of structure is given.Numerical simulation shows effectiveness of the method with a high rate of correct classification.
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