引用本文: | 苏勇,林维正.用信号分析技术检测材料的声速和衰减[J].建筑材料学报,2001,(1):65-69 |
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用信号分析技术检测材料的声速和衰减 |
苏勇,林维正
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摘要: |
用快速傅氏变换(FFT)技术进行超声回波信号体魄分析,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。 |
关键词: 快速傅氏变换 声速 衰减 信号分析 传递函数 |
DOI: |
分类号:TB553 |
基金项目: |
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Measurements of Material''''s Acoustic Velocity and Attenuation by Signal Analysis |
SU Yong LIN Wei zheng
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Abstract: |
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. |
Key words: fast Fourier transform,transfer function,velocity,attenuation,quality factor Q |
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