Influence of source frequency on impact-echo data quality for testing concrete structures
Influence of source frequency on impact-echo data quality for testing concrete structures
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DOI：
10.1016/s0963-8695(02)00062-2
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发表时间：
2003-06-01
影响因子：
4.2
通讯作者：
Lausch, R
中科院分区：
文献类型：
--
作者：
Colla, C;Lausch, R
在冲击回波数据中，当频谱中存在大量峰值时，对测量频率的正确解释可能成为一个问题。一个重要的评估标准是测量峰值的大小。该信号参数受到在撞击点处产生的波的频率分量的强烈影响。现场测量表明，在某些情况下，波中心频率可能比信号的最高可用频率更重要。根据现场数据和实验室校准测量值，计算了冲击接触时间、波中心和最大频率随冲击源大小的变化。的测试和正确的数据解释的规划的后果进行了讨论。得出的结论是，预期的测量频率应激发输入信号中的最大能量，以实现最佳质量的数据和方便的数据解释。(C)2002爱思唯尔科技有限公司版权所有。
In impact-echo data, a correct interpretation of the measured frequencies may become a problem when in presence of a multitude of peaks in the spectra. An important evaluation criterion is then the magnitude of the measured peaks. This signal parameter is strongly influenced by the frequency components of the wave generated at the impact point. On-site measurements showed that, in particular cases, the wave centre frequency might have greater importance than the maximum usable frequency of the signal. Values of impact contact time, wave centre and maximum frequency in function of the impact source size were calculated from on-site data and from calibration measurements in the laboratory. The consequences for the planning of the tests and for a correct data interpretation are discussed. It was concluded that the expected measured frequency should be excited with maximum energy in the input signal in order to achieve an optimum quality of the data and ease data interpretation. (C) 2002 Elsevier Science Ltd. All rights reserved.