Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1981-11-30
1984-05-01
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
310337, 367159, 367162, H04R 1700
Patent
active
044465440
ABSTRACT:
A multimode hydrophone of small diameter and low weight providing dipole ectivity patterns over a decade range of low frequencies by utilizing a pair of orthogonal dipole signals and a nondirectional reference signal to eliminate directional ambiguity. Each multimode hydrophone is a thin wall tube divided electrically into quadrants which permits differencing or opposing halves to produce signals with dipole directivity patterns and the formation of a nondirectional reference signal by summing all four quadrants. The hydrophone tube comprises inert and piezoelectric materials, selected and combined so as to shift the resonant frequency of the tube lower while keeping the over-all tube diameter as small as possible.
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Beers Robert F.
McGill Arthur A.
McGowan Michael J.
The United States of America as represented by the Secretary of
Tudor Harold J.
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