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10 April 2008 Comparative evaluation of ultrasonic lenses and electric point contacts for acoustic flux imaging in piezoelectric single crystals
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Abstract
Conducting micro-spheres approximating point probes have been employed to piezoelectrically excite and detect ultrasonic wave packages in anisotropic single crystals. Imaging based on the detection of magnitude and phase is performed in transmission. The experimental data can be used for the determination of the elastic constants of the material. Here we compare this approach with imaging using conventional ultrasonic lenses and water as a coupling fluid. The large bandwidth and the absence of internal lens echoes in the Coulomb excitation and detection scheme permit unperturbed monitoring of multiple echoes in plane-parallel samples and the detailed investigation of mode conversion processes of longitudinal and transverse waves at the surfaces of the crystal. Due to differences in the coupling between the probes and the ultrasound in the sample, excitation of ultrasound by an acoustic lens or an electrical point contact, respectively, result in noticeably different phonon focusing patterns. This is illustrated for lithium niobate single crystals.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Twerdowski, M. Pluta, R. Wannemacher, and W. Grill "Comparative evaluation of ultrasonic lenses and electric point contacts for acoustic flux imaging in piezoelectric single crystals", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69351U (10 April 2008); https://doi.org/10.1117/12.776253
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