Accession Number : ADD017601

Title :   Noise Control Composite.

Descriptive Note : Patent, Filed 31 Aug 82, patented 30 May 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Fischer, Eugene C ; Montemarano, Jean A ; Castelli, Vincent J ; Dickey, Joseph W

Report Date : 30 May 1995

Pagination or Media Count : 5

Abstract : A composite for use on submarines and surface craft for controlling self-generated noise when listening with sonar. The composite includes two layers of PVF2 transducers separated by a layer of phase shifting or absorbing material. The inner transducer senses noise from the ship and subtracts this from the signal from the outer transducer representing noise plus the desired signal. In a second mode the sensed noise is regenerated through the outer transducer is so out of phase to cancel the noise and allow more accurate detection. (MM)

Descriptors :   *SHIP NOISE, *SONAR, *PATENTS, *SUBMARINE NOISE, *ACOUSTIC COUNTERMEASURES, ACOUSTIC DETECTION, ABSORBERS(MATERIALS), ACOUSTIC ATTENUATION, NOISE REDUCTION, SUBMARINE DETECTION, SONAR TRANSDUCERS, PHASE SHIFT CIRCUITS

Subject Categories : Acoustic Detection and Detectors
      Acoustic Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE