Jocker Jeroen, Smeulders David
Delft University of Technology, Department of Civil Engineering and Geosciences, Delft, The Netherlands.
Ultrasonics. 2009 Mar;49(3):319-30. doi: 10.1016/j.ultras.2008.10.006. Epub 2008 Oct 30.
Ultrasonic reflection and transmission measurements on saturated, plane-parallel, poroelastic slabs are presented. A data processing technique is proposed to obtain poroelastic parameters from transmission measurements. A special experimental data acquisition and processing technique is applied to minimize the finite beam effects of the transducers. This technique yields results which can be compared with poroelastic plane-wave theory. Results of normal- and oblique-incidence measurements are presented, and transmission data are processed to yield wave speeds, sample thickness, angle of incidence, tortuosity, and permeability. The results show good agreement with independent measurements, and they are subsequently used as input for a forward modeling of the complete transmitted and reflected waveforms utilizing Biot theory. The agreement between recorded and modeled signals is good, both in time and frequency domain.
本文介绍了对饱和、平面平行的多孔弹性平板进行超声反射和透射测量的方法。提出了一种数据处理技术，用于从透射测量中获取多孔弹性参数。应用了一种特殊的实验数据采集和处理技术，以最小化换能器的有限波束效应。该技术产生的结果可与多孔弹性平面波理论进行比较。给出了垂直入射和斜入射测量的结果，并对透射数据进行处理，以得到波速、样品厚度、入射角、曲折度和渗透率。结果与独立测量结果吻合良好，随后将其用作利用毕奥理论对完整透射和反射波形进行正演模拟的输入。记录信号与模拟信号在时域和频域上的吻合度都很好。
