Distributed Fiber Optic Laser Ultrasonic System
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 08, 2000
- Accession Number
- ADD019822
Entities
People
- Ignacio Perez
Organizations
- United States Department of the Navy