Comparative evaluation of ultrasonic lenses and electric point contacts for acoustic flux imaging in piezoelectric single crystals

E. Twerdowski; M. Pluta; R. Wannemacher; W. Grill

doi:10.1117/12.776253

10 April 2008 Comparative evaluation of ultrasonic lenses and electric point contacts for acoustic flux imaging in piezoelectric single crystals

E. Twerdowski, M. Pluta, R. Wannemacher, W. Grill

Author Affiliations +

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 69351U (2008) https://doi.org/10.1117/12.776253
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

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.

Citation Download Citation

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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KEYWORDS

Acoustics

Crystals

Ultrasonics

Transducers

Phonons

Lenses

Ultrasonography

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