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Modified single crystals for high-power underwater projectors.

Authors
  • Sherlock, Nevin P
  • Meyer, Richard J Jr
Type
Published Article
Journal
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control
Publisher
Institute of Electrical and Electronics Engineers
Publication Date
Jun 01, 2012
Volume
59
Issue
6
Pages
1285–1291
Identifiers
DOI: 10.1109/TUFFC.2012.2319
PMID: 22718879
Source
Medline
License
Unknown

Abstract

Underwater electroacoustic projectors using single crystals based on the lead magnesium niobate-lead titanate (PMNT) composition were investigated. The large electromechanical coupling coefficient (k(33) > 0.90) and piezoelectric coefficient (d(33) > 1500 pC/N) of PMNT have been demonstrated to improve transducer bandwidth and source level relative to conventional piezoelectric ceramics. The low mechanical quality factor (Q(M) < 200) and low temperature stability (T(RT) < 95°C) of PMNT, however, limit its utility in high-power, high-duty-cycle applications. Use of modified single crystals was shown to result in transducers which exhibit up to 5 dB improvement in source level over PMNT when operated at resonance. Compared with a PZT4 transducer, these modified crystals offer similar source level and power handling capability at resonance, but the available bandwidth is doubled and a 6 dB improvement in maximum source level is achieved when driven off resonance.

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