Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1960-09-16
1980-08-26
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
H04R 1700
Patent
active
042198895
ABSTRACT:
1. An improved underwater transducer comprising a piston of titanium having a planar active face for transfer of sonic wave energy between said piston and the water to which it is exposed, a housing having an opening whose perimeter is slightly larger all around than the perimeter of the piston, said piston being disposed across said opening, and nearly closing said opening with its active face directed outwardly, an elastomeric sealing material bonded to the perimeter of the piston and the perimeter of the housing around the opening and together with the piston completely closing the opening in the housing and with the active face of the piston exposed for contact with sea water, said elastomeric material permitting vibratory reciprocation of said piston relative to said housing and normal to its planar face for transfer of sonic energy between the piston and the water to which it is exposed, an electromechanical energy conversion means supported in the housing and coupled to the piston, said means together with said piston comprise a double mass elastic system and includes an electromechanical transducer element to which is securely and rigidly affixed said piston and another mass with the transducer element therebetween with the piston, the other mass and the transducer element in line and oriented longitudinally of the housing, and an acoustic isolator pressure release material in the form of a stack of paper disposed between the inner end of said other mass and the housing in the direction of relative longitudinal movement therebetween.
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NRL Report 5267, by S. Hanish, pp. ii, 1 & 2, Mar. 6, 1959.
Military Spec. Comm. Set, Sonar, Swimmer's, 21 pp. Mil-C-17831A (Ships) F 16, 1956.
Baron Sidney
Parssinen Edwin J.
White John F.
Farley Richard A.
Lall Prithvi C.
McGill Arthur A.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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