Titov Sergey, Maev Roman Gr
IEEE Trans Ultrason Ferroelectr Freq Control. 2013 Jul;60(7):1435-45. doi: 10.1109/TUFFC.2013.2715.
An ultrasonic system with a linear array for characterization of a layered specimen placed in immersion liquid parallel to the aperture of the array is considered. To estimate the longitudinal and transverse wave velocities as well as the thickness and density of the specimen, it is proposed to decompose the spatio-temporal data recorded by the array in a spectrum of plane pulse waves. Based on fitting the developed wave model of the system to the experimental data, it is shown that the relative delays and amplitudes of the spectral responses can be used for the estimation of the velocities and thickness of the layer and its density. The distortions of the plane wave spectrum caused by the spatial discretization of the array data are considered. It is proposed to suppress these distortions using individual interpolating processing of the received pulses separated in the spatio-temporal domain. The developed technique is experimentally verified on a fused quartz plate evaluated with a 17-MHz linear array. The relative reproducibility of the estimation is found to be 0.11% in the longitudinal wave velocity and thickness of the plate, and 0.5% and 5% in the transverse wave velocity and the density, respectively.
考虑一种具有线性阵列的超声系统，用于对置于与阵列孔径平行的浸没液体中的分层试样进行表征。为了估计纵向和横向波速以及试样的厚度和密度，建议将阵列记录的时空数据分解为平面脉冲波谱。基于将所开发的系统波模型与实验数据进行拟合，结果表明光谱响应的相对延迟和幅度可用于估计层的速度、厚度及其密度。考虑了由阵列数据的空间离散化引起的平面波谱畸变。建议使用在时空域中分离的接收脉冲的单独插值处理来抑制这些畸变。所开发的技术在使用17 MHz线性阵列评估的熔融石英板上进行了实验验证。发现估计的相对再现性在板的纵向波速和厚度方面为0.11%，在横向波速和密度方面分别为0.5%和5%。
