Accession Number : ADD010077

Title :   Low Frequency, Log-Periodic Acoustic Array.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Cuomo,Frank W

Report Date : 07 Dec 1982

Pagination or Media Count : 6

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 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.

Descriptors :   *Patents, *Linear arrays, *Hydrophones, Audio frequency, Low frequency, Frequency bands, Directional, Omnidirectional, Arrays, Constants, Multiple operation, Superlow frequency, Ratios, Frequency, Dipoles, Patterns, Ultralow frequency, Axes

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE