A noncontacting electromagnetic-acoustic-resonance technique is presented for generating and detecting vibrational modes with prescribed symmetries in piezoelectric trigonal crystals with cylindrical geometry. This technique provides the experimental basis for determining all elastic constants from a single specimen, while overcoming difficulties in mode identification that can occur in traditional resonant-ultrasound spectroscopy. Narrow-band tone-burst excitation and piezoelectric coupling are employed with various geometrical configurations of electrodes near the surface of a quartz specimen. The geometries of the specimen and plates include all the symmetry elements of the crystallographic point group, which enables selection of the irreducible representation of excited vibrational modes simply by switching electrical leads to the electrodes.
Citation: IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control
Pub Type: Journals
elastic moduli, EMAR, EMAT, piezoelectric, quartz, resonant ultrasound spectroscopy, Ritz analysis, trigonal crystals, ultrasonic resonance