Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-06-09
1994-08-30
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367157, 367162, 367140, 310325, 310334, 310337, H04R 1700
Patent
active
053434439
ABSTRACT:
An acoustic transducer having impedance matched layers that can be deployed in environments having wide temperature variations. An anisotropic layer provides a low coefficient of thermal expansion orthogonally to the direction of sound wave propagation. The anisotropic layer may be a solid matrix embedded with fibers, such as glass, arranged in a common orientation.
REFERENCES:
patent: 4823041 (1989-04-01), Inoue et al.
patent: 4907207 (1990-03-01), Moeckl
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Henry Beerman, "Optimizing Matching Layers for a Three-Section Broad-Band Piezoelectric PZT-5A Transducer Operating into Water", IEEE Transactions on Sonics and Ultrasonics, vol. SU-28, No. 1, Jan., 1981, pp. 52-53.
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W. Steichen, et al., "Determination of the Power Limits of a High Frequency Transducer Using the Finite Element Method", Proceedings of the International Workshop, Lille, France, May 26-27, 1987, pp. 160-174.
Takeshi Inoue et al., "Investigation for Wide-Band Underwater Ultrasonic Transducers", The Transactions of the IEICE, vol. E70, No. 8, Aug. 1987, pp. 723-733.
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Ei'ichi Ando, et al., "Finite Element Simulation of Steady-State Heat Problem in Electrostrictive Vibrators", Faculty of Engineering, Toyama University, Trans. Inst. Electron. Inf. Commun. Eng. (Japan), vol. J72-A, No. 6, pp. 881-892, 1989.
Eldred J. Woodrow
Rowe, Deines Instruments Inc.
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