Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1993-01-08
1994-11-22
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367158, 310800, 310337, 114 212, H04R 1700
Patent
active
053675010
ABSTRACT:
A dual frequency, polymer hydrophone, array for a submersible vehicle is closed. A mid-frequency transducer array is employed in the forward end of a submersible vehicle. Between the mid-frequency array and a nose portion of the submersible vehicle is a single or multiple board piezoelectric polymer array employed to implement a secondary, high-frequency transducer array. Amplifying and signal conditioning units are mounted adjacent or on one metallic electrode layer or formed integrally thereon to minimize signal lead loss. The piezoelectric polymer material is chosen to have a density coefficient and sound velocity substantially equivalent to an acoustic window in the nose portion of the submersible vehicle and to be substantially transparent to the mid-frequency array. Minimal degradation of the mid-frequency received or transmitted signals occurs due to the transparency of the high-frequency array. Benefits of the present invention include providing wide area search capability with the mid-frequency array and high-resolution homing and object classification, among other things, with the high-frequency transducer array.
REFERENCES:
patent: 4192246 (1980-03-01), Hodges et al.
patent: 4373143 (1983-02-01), Lindberg
patent: 4633119 (1986-12-01), Thompson
patent: 4737939 (1988-04-01), Ricketts
patent: 4811307 (1989-03-01), Pohlenz et al.
patent: 4950936 (1990-07-01), Rynne et al.
Kelly James G.
Walsh Charles R.
Eldred J. Woodrow
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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