Low frequency, log-periodic acoustic array

Details Low frequency, log-periodic acoustic array Low frequency, log-periodic acoustic array

1981-01-26

1982-12-07

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

3437925, 367905, H04R 144

Patent

active

043631150

ABSTRACT:
A method for determining optimum element spacing for a low frequency, log-periodic acoustic line array comprising a plurality of omnidirectional hydrophones arranged in a line wherein the spacing between hydrophones is based on a logarithmic relationship using multiple dipole pairs, each pair centered about the acoustic axis of the array, such that the distance between each dipole pair bears a constant ratio to the wavelength of the acoustic frequency band to be investigated by that hydrophone pair. Each dipole pair relates to a particular frequency band and the assembled array covers at least a decade range of frequencies through juxtaposition of contiguous frequency bands. The overall arrangement assures retention of selected beam pattern directionality over the entire decade range of frequencies.

REFERENCES:
patent: 3500414 (1970-03-01), Woerrlein
patent: 3765022 (1973-10-01), Tanner
patent: 3780372 (1973-12-01), Unz
patent: 3877033 (1975-04-01), Unz
patent: 3889227 (1975-06-01), Takamizawa et al.
patent: 4064479 (1977-12-01), Ruehle
patent: 4075635 (1978-02-01), Unz
patent: 4104641 (1978-08-01), Unz
patent: 4180792 (1979-12-01), Lederman et al.
Hixson et al., Broadband Constant Beamwidth Acoustical Arrays, Tech. Memodum No. 19, Acoustics Research Laboratory, May 1970.

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