Modified single crystals for high-power underwater projectors

Nevin P. Sherlock; Richard J. Meyer

doi:10.1109/TUFFC.2012.2319

Modified single crystals for high-power underwater projectors

Nevin P. Sherlock, Richard J. Meyer

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

Underwater electroacoustic projectors using single crystals based on the lead magnesium niobate-lead titanate (PMNT) composition were investigated. The large electromechanical coupling coefficient (k₃₃ > 0.90) and piezoelectric coefficient (d₃₃ > 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.

Original language	English (US)
Article number	6217577
Pages (from-to)	1285-1291
Number of pages	7
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	59
Issue number	6
DOIs	https://doi.org/10.1109/TUFFC.2012.2319
State	Published - 2012

All Science Journal Classification (ASJC) codes

Instrumentation
Acoustics and Ultrasonics
Electrical and Electronic Engineering

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10.1109/TUFFC.2012.2319

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abstract = "Underwater electroacoustic projectors using single crystals based on the lead magnesium niobate-lead titanate (PMNT) composition were investigated. The large electromechanical coupling coefficient (k33 > 0.90) and piezoelectric coefficient (d33 > 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 (TRT < 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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Modified single crystals for high-power underwater projectors

Abstract

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