Research/Patents/US 5420825
US 5420825Tier 3 — General Defense

NOISE CONTROL COMPOSITE

Assignee

US Government

Filed as: UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

Filed

Aug 31, 1982

Granted

May 30, 1995

Location

ARNOLD MD US

Abstract

A composite for use on submarines and surface craft for controlling self-erated 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 180° out of phase to cancel the noise and allow more accurate detection.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jan 6, 1983

Rescinded

Sep 7, 1994

Duration

11 years, 8 months

Inventor

  • 1EUGENE C. FISCHER

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records