Time Domain Waveforms of a Line-Focus Transducer Probing Anisotropic Solids
Nelson N. Hsu, Gerald V. Blessing, D Xiang
We have developed a large lensless line-focus wideband ultrasonic transducer which can be used to probe solid materials through water. With conventional ultrasonic equipment the transducer can perform time and polarization resolved surface and body wave velocity measurements. Time domain waveforms obtained by rotating the transducer about the normal of an anisotropic sample surface provide a voltage as a function of time and orientation, V(time,theta), plot. We show, as examples, both theoretical computation and experimental results of these plots for quartz samples. The same computational and experimental procedures can be used to obtain results for composite materials modeled as arbitrary anisotropic layers.