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Proceedings Paper

Advanced piezoelectric single crystal based transducers for naval sonar applications
Author(s): Kevin A. Snook; Paul W. Rehrig; Wesley S. Hackenberger; Xiaoning Jiang; Richard J. Meyer Jr.; Douglas Markley
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Paper Abstract

Transducers incorporating single crystal piezoelectric Pb(Mg1/3Nb2/3)x-1TixO3 (PMN-PT) exhibit significant advantages over ceramic piezoelectrics such as PZT, including both high electromechanical coupling (k33 > 90%) and piezoelectric coefficients (d33 > 2000 pC/N). Conventional <001> orientation gives inherently larger bandwidth and output power than PZT ceramics, however, the anisotropy of the crystal also allows for tailoring of the performance by orienting the crystal along different crystallographic axes. This attribute combined with composition refinements can be used to improve thermal or mechanical stability, which is important in high power, high duty cycle sonar applications. By utilizing the "31" resonance mode, the high power performance of PMN-PT can be improved over traditional "33" mode single crystal transducers, due to an improved aspect ratio. Utilizing novel geometries, effective piezoelectric constants of -600 pC/N to -1200 pC/N have been measured. The phase transition point induced by temperature, pre-stress or field is close to that in the "33" mode, and since the prestress is applied perpendicular to the poling direction in "31" mode elements, they exhibit lower loss and can therefore be driven harder. The high power characteristics of tonpilz transducers can also be affected by the composition of the PMN-PT crystal. TRS modified the composition of PMN-PT to improve the thermal stability of the material, while keeping the loss as low as possible. Three dimensional modeling shows that the useable bandwidth of these novel compositions nearly equals that of conventional PMN-PT. A decrease in the source level of up to 6 dB was calculated, which can be compensated for by the higher drive voltages possible.

Paper Details

Date Published: 6 April 2006
PDF: 8 pages
Proc. SPIE 6170, Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics, 61700H (6 April 2006); doi: 10.1117/12.659638
Show Author Affiliations
Kevin A. Snook, TRS Technologies, Inc. (United States)
Paul W. Rehrig, TRS Technologies, Inc. (United States)
Wesley S. Hackenberger, TRS Technologies, Inc. (United States)
Xiaoning Jiang, TRS Technologies, Inc. (United States)
Richard J. Meyer Jr., Applied Research Lab. (United States)
Douglas Markley, Applied Research Lab. (United States)

Published in SPIE Proceedings Vol. 6170:
Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics
William D. Armstrong, Editor(s)

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