用信号分析技术检测材料的声速和衰减  

Measurements of Material's Acoustic Velocity and Attenuation by Signal Analysis

作　　者：苏勇[1] 林维正[1] 

机构地区：[1]同济大学声学研究所,上海200092

出　　处：《建筑材料学报》2001年第1期65-69,共5页Journal of Building Materials

摘　　要：用快速傅氏变换 (FFT)技术进行超声回波信号分析 ,以回波传递函数导出与声速和衰减有关的频域方程 ;用频谱比方法测量材料的衰减品质因素Q值 ,并与脉冲法所得结果进行比较 .In this paper, the frequency domain equations were deduced from the echo transfer function by the analysis of echo signals with fast Fourier transform (FFT) technology. The material's quality attenuation value Q were measured with frequency spectrum ratio method. Experiment methods, related instruments were also introduced. Examples of measurements were given and the results were compared with those of pulse method.

关 键 词：快速傅氏变换 声速 衰减 信号分析 传递函数 

分 类 号：TB553[理学—物理]