Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1991-06-24
1992-11-24
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367158, 367159, 367162, 310334, 310337, H04R 1700
Patent
active
051669072
ABSTRACT:
A solid-state tunable transducer has been developed by incorporating an elastically nonlinear material, silicone rubber, into an electroacoustic transducer made from piezoelectric ceramics. The resonant frequency and mechanical Q of the transducer are tuned mechanically by applying a uniaxial compressive stress to the composite. The resonant frequency is tuned electrically by placing a piezoelectric actuator into the composite and varying the magnitude of the d.c. bias.
REFERENCES:
patent: 4197478 (1980-04-01), Silvus, Jr.
patent: 4633119 (1986-12-01), Thompson
"Smart Electroceramics", Newnham et al., 1991, pp. 463-480.
"A New Electronic Controlled Suspension Using Piezo-Electric Ceramics", Tsuka et al., IEEE Workshop on Electronic Applications in Transportation, 1990.
"Variable Resonant Frequency Crystal Systems", Fry, W. J., et al., The Journal of the Acoustical Society of America, pp. 94-110, 1951.
"Tunable High-Frequency High-Power Piezoceramic Radiator", E. P. Lanina Sov. Phys. Acoust., 207-209, 1978.
"Biosonar and Neutral Computation in Bats", Suga, N., Scientific American, pp. 60-68, 1990.
"Listening in the Dark: The Voices of Bats", Griffin, D. R., New Haven: Yale University Press, 413 pages, pp. 110-119 included, 1958.
Blaszkiewicz Michael
Newnham Robert E.
Xu Qi C.
Eldred J. Woodrow
Monahan Thomas J.
The Pennsylvania Research Corporation
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