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Determination of isotropic layer parameters from spatiotemporal signals of an ultrasonic array

机译:根据超声阵列的时空信号确定各向同性层参数

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The paper discusses a method for measuring the velocities and attenuation of longitudinal and transverse ultrasonic waves and the density and thickness of the isotropic layer with an array placed in an immersion liquid parallel to the sample. The method is based on the recording of the total spatiotemporal signal of the array and its expansion into a spatial spectrum of pulse plane wave response. The ultrasonic velocity and sample thickness depend on the response delay of the plane wave in the layer from the transverse projection of the slowness vector. The density and attenuation are determined from the behavior of the amplitudes of spectral responses. To confirm this method in experiment, the parameters of a polystyrene plate have been measured using a linear 32-element array with a central frequency of 17 MHz.
机译:本文讨论了一种通过将阵列放置在与样品平行的浸没液体中来测量纵向和横向超声波的速度和衰减以及各向同性层的密度和厚度的方法。该方法基于阵列的总时空信号的记录及其在脉冲平面波响应的空间频谱中的扩展。超声波速度和样品厚度取决于层中平面波从慢度矢量的横向投影开始的响应延迟。密度和衰减由频谱响应幅度的行为确定。为了在实验中证实此方法,已使用中心频率为17 MHz的线性32元素阵列测量了聚苯乙烯板的参数。

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