Accession Number : ADD011196

Title :   Small Diameter, Low Frequency Multimode Hydrophone.

Descriptive Note : Patent,


Personal Author(s) : Connolly,G C , Jr

Report Date : 01 May 1984

Pagination or Media Count : 5

Abstract : A multimode hydrophone of small diameter and low weight providing dipole directivity 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 lower while keeping the over-all tube diameter as small as possible. (Author)

Descriptors :   *Patents, *Hydrophones, *Multimode, *Low frequency, Signals, Diameters, Inert materials, Piezoelectric materials, Lightweight, Dipoles, Orthogonality, Resonant frequency, Quadrants

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE