Accession Number:

ADD018100

Title:

Towed Array Strain-Sensing Noise Canceller.

Descriptive Note:

Patent, Filed 9 Sep 81, patented 2 Jul 96,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1996-07-01

Pagination or Media Count:

5.0

Abstract:

Method and apparatus are disclosed for reducing breathing- wave induced noise in a liquid-tilled elongate hose housing a hydrophone array. The arrangement involves sensing radial strain induced in the hose wall by the breathing waves created as the hose is drawn longitudinally through water and subtracting a multiple of the sensed value thereof from the array hydrophone output. Arrangements for measuring the breathing-wave-induced wall strains include 1 relative phase shifts in light passing through the sensing arm of an optical fiber interferometer, and 2 signal currents generated from piezolectric polymer both of which are disposed inside the hose wall surrounding a hydrophone.

Subject Categories:

  • Acoustics
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE