Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1986-04-30
1988-08-16
Walsh, Donald P.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367155, 367165, 310337, H04R 1700
Patent
active
047649070
ABSTRACT:
An underwater sonar transducer includes a centrally located beam with a plurality of stacks of piezoelectric transducer elements extending from each side, with a rigid end beam at the opposite end of each stack. A plurality of bolts extending from one end beam to the other on opposite sides of the stacks are tightened to apply a desired amount of prestress on the ceramic stacks. Arcuate radiating elements are welded to opposite sides of each end beam, end cap members are fastened to the centrally located beam at each end of the transducer and a jacket of elastomeric material is bonded to the edges of the end cap members to prevent ingress of fluid into the piezoelectric elements. Energizing of the piezoelectric elements causes expansion and contraction of the stacks, pushing the end beams in and out and causing bowing of the radiating elements to project sonar energy.
REFERENCES:
patent: 3258738 (1966-06-01), Merchant
patent: 4287582 (1981-09-01), Tocquet
patent: 4420826 (1983-12-01), Marshall, Jr. et al.
patent: 4462093 (1984-07-01), Upton
Royster, L., "The Flextensional Concept: A New Approach to the Design of Underwater Acoustic Transducers", Applied Acoustics vol. 3, No. 2, 1970.
Dahlstrom David K.
Fife Merrill E.
Judy Charles R.
Allied Corporation
Parr Ted L.
Walsh Donald P.
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