Fiber optic Bragg grating demodulator and sensor incorporating s

Details Fiber optic Bragg grating demodulator and sensor incorporating s Fiber optic Bragg grating demodulator and sensor incorporating s

1996-03-05

1997-05-27

Ben, Loha

Optical: systems and elements

Optical demodulator

25022718, 385 4, 385 30, 385 13, 356345, G02F 200, G01J 400

Patent

active

056337485

ABSTRACT:
A tapped Bragg grating is used to demodulate optical signals reflected by ber optic Bragg gratings in a sensor in which the line spacings in the fiber optic Bragg gratings vary in response to a mechanical stress. A light detector, or light detector array is used to detect variation in the angular pattern of the light scattered by the tapped Bragg grating. Arrangements of mirrors, or alternatively arrangements of lenses, are used to concentrate the scattered light toward the light detectors and to enhance the angular changes in the scattered light.

REFERENCES:
patent: 4761073 (1988-08-01), Meltz et al.
patent: 5039221 (1991-08-01), Layton et al.
patent: 5380995 (1995-01-01), Udd et al.
patent: 5394488 (1995-02-01), Fernald et al.
patent: 5397891 (1995-03-01), Udd et al.

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