Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1978-02-06
1979-12-11
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367166, 367171, H04B 1300
Patent
active
041785770
ABSTRACT:
A pressure-balanced hydrophone having a low cut-off frequency which inclu a pair of piezo-ceramic tubes, wired in series, and having one end of each tube secured to a metal block in the center. The second end of one of the ceramic tubes is covered by means of a solid metal end cap and the second end of the other ceramic tube is covered by a porous sintered metal end cap. The unit is enclosed in an elastomeric cylindrical boot which is closed at the open end by a metallic disc. A pair of fill plugs are provided to fill the interior and the exterior of the piezo-ceramic tubes with a suitable oil. The unique feature of subject device is that a plurality of pores in the porous sintered metal end cap act as a plurality of capillaries for pressure balancing and thus make the hydrophone insensitive to hydrostatic pressure variations.
REFERENCES:
patent: 2571899 (1951-10-01), Kroft et al.
patent: 3263209 (1966-07-01), Madison
patent: 3328752 (1967-06-01), Sims
patent: 3391385 (1968-07-01), Lubell
patent: 3660809 (1972-05-01), Pearson
patent: 3713086 (1973-01-01), Trott
patent: 3731266 (1973-05-01), Ammann
patent: 3781781 (1973-12-01), Groves, Jr.
Cini Hector J.
Meyers Theodore J.
Lall Prithvi C.
McGill Arthur A.
Sciascia Richard S.
The United States of America as represented by the Secretary of
Tudor Harold J.
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