Underwater transducer and projector therefor

Details Underwater transducer and projector therefor Underwater transducer and projector therefor

1972-12-04

1976-11-16

Tudor, Harold

Communications: electrical

Selective

Interrogation response

310 91, 340 9, H04B 1300

Patent

active

039926931

ABSTRACT:
An underwater transducer having both projector and hydrophone elements utilizes a new technique permitting the annular projector rings of a given piezoelectric material and resonant frequency to be tailored in diameter to accommodate various requirements, such as a need for more interior space. Where the projector rings can be expanded to the diameter of an accompanying hydrophone array, this makes possible a more compact and, in particular, a shorter structure than has been used for transducers of similar capability before. In the transducer the projector rings are positioned axially along a central support tube alternating with the hydrophones arranged in annular groups. Each projector ring is formed of a plurality of segments of alternately active material and inactive material having a sound velocity differing from (usually faster than) that of the active material. Thus the diameter of the annular elements for a given active material and a desired resonant frequency may be varied since the resonant frequency is related to the velocity of sound in the composite material used in the elements.

REFERENCES:
patent: 2434648 (1948-01-01), Goodale, Jr. et al.
patent: 3139603 (1964-06-01), Church et al.
patent: 3142035 (1964-07-01), Harris
patent: 3230505 (1966-01-01), Parker et al.
patent: 3243767 (1966-03-01), Kendig et al.
patent: 3243768 (1966-03-01), Roshon, Jr. et al.
patent: 3375488 (1968-03-01), Bridges et al.
patent: 3546497 (1970-12-01), Craster
patent: 3564491 (1971-02-01), Granfoss et al.
Under Water Acoustics Handbook II, Vernon M. Albers, University Press, 1965, p. 335.

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