Distributed fiber optic laser ultrasonic system

Details Distributed fiber optic laser ultrasonic system Distributed fiber optic laser ultrasonic system

1998-12-02

2000-08-08

Font, Frank G.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2100

Patent

active

061009695

ABSTRACT:
An optical fiber coupled to a high power laser carries laser energy to la-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.

REFERENCES:
patent: 4887605 (1989-12-01), Angelsen et al.
patent: 5426297 (1995-06-01), Dunphy et al.
patent: 5608166 (1997-03-01), Monchalin et al.

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