Stack imaging of spectral amplitudes based on impact-echo for flaw detection
Stack imaging of spectral amplitudes based on impact-echo for flaw detection
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DOI：
10.1016/s0963-8695(01)00045-7
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发表时间：
2002-04-01
影响因子：
4.2
通讯作者：
Watanabe, T
中科院分区：
文献类型：
--
作者：
Ohtsu, M;Watanabe, T
冲击回波法最近在混凝土结构缺陷的无损评估方面引起了广泛关注。提取负责反射器位置的共振频率，估计缺陷的深度和存在。然而到目前为止，该技术在实际应用中还存在一些局限性。这是因为冲击回波在使用中的混凝土结构的应用中还存在尚未解决的问题。因此，在弹性动力学和信号分析的基础上对该方法进行了理论研究。为了克服传统程序中识别峰值频率的困难，研究了一种应用成像程序来评估混凝土缺陷的新程序。因此，开发了基于冲击回波的频谱幅度叠加成像。该程序应用于预应力混凝土梁，以对灌浆管道和未灌浆管道进行分类，可以直观地识别未灌浆管道的位置和存在。 (C) 2002 Elsevier Science Ltd. 保留所有权利。
The impact-echo method recently has drawn a remarkable amount of attention for nondestructive evaluation of defects in concrete structures. Extracting resonance frequencies responsible for the locations of reflectors, the depth and the presence of defects are estimated. So far, however, the technique has some limitations for practical applications. This is because there exist unresolved problems in the application of the impact-echo to concrete structures in service. Consequently, the method is studied theoretically on the basis of the elastodynamics and the signal analysis. In order to circumvent the difficulty to identify peak frequencies in the conventional procedure, a new procedure to evaluate defects in concrete is investigated, applying an imaging procedure. Thus, stack imaging of spectral amplitudes based on the impact-echo is developed. This procedure is applied to a prestressed concrete beam to classify a grouted duct and an ungrouted duct, The location and the presence of the ungrouted duct can be visually identified. (C) 2002 Elsevier Science Ltd. All rights reserved.