Local phase velocimetry based on the spatio-temporal gradient analysis
Local phase velocimetry based on the spatio-temporal gradient analysis
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DOI：
10.11499/sicep.2004.0.82.1
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发表时间：
2005-05
期刊：
影响因子：
--
通讯作者：
K. Teramoto;K. Tsuruta
中科院分区：
文献类型：
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作者：
K. Teramoto;K. Tsuruta
超声兰姆波技术是无损评价（NDE）方法的潜在候选者。材料中的相位测速主要通过测量一对发射器和接收器之间的飞行时间和距离来完成。提出了一种基于时空梯度分析的局部相位测速方法。该方法具有通过四维矢量之间的线性关系测量零阶反对称Lamb波场的局部相速度的能力，四维矢量由以下分量定义：1：垂直位移，2：垂直粒子速度，和3，4：表面的一对剪切应变。本文讨论了局域相速度计的计算过程，并通过数值实验研究了它们的物理意义。
Ultrasonic Lamb-wave techniques are potential candidates of non-destructive evaluation (NDE) methodology. The phase velocimetry in the material mostly is done by measuring the time-of-flight and distance between a pair of transmitter and receiver. This paper proposes a novel method of local phase velocimetry based on the spatio-temporal gradient analysis. The method has an ability to measure the local phase velocity of the zeroth order anti-symmetric Lamb wave field through the linearity among the four-dimensional vectors which is defined by following components: 1:a vertical displacement, 2:vertical particle velocity, and 3,4:a pair of shear strains of the surface. In this study, the computational process of the local phase velocimetry is discussed and their physical meanings are investigated through numerical experiments.