Accession Number:

ADD019822

Title:

Distributed Fiber Optic Laser Ultrasonic System

Descriptive Note:

Patent, Filed 2 Dec 1998, Patented 8 Aug 2000

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

2000-08-08

Pagination or Media Count:

8.0

Abstract:

An optical fiber coupled to a high power laser carries laser energy to laser-activated sound generating materials disposed at intervals along its length. The sound-generating materials are acoustically coupled to an object or objects to be monitored. Acoustic reflections from the objects modulate the periods of Bragg gratings formed in a separate core of the fiber, or in the core of a separate fiber. The modulation of a Bragg grating period is detected as a Doppler shift in an interrogation beam reflected by the grating.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE