Accession Number : ADD018561

Title :   Fiber Optic Bragg Grating Demodulator and Sensor Incorporating Same

Descriptive Note : Patent, Filed 5 Mar 96, patented 27 May 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Perez, Ignacio M ; Bibby, Thomas F

Report Date : 27 May 1997

Pagination or Media Count : 12

Abstract : A tapped Bragg grating is used to demodulate optical signals reflected by fiber 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.

Descriptors :   *FIBER OPTICS, *GRATINGS(SPECTRA), *DEMODULATORS, *PATENTS, SIGNAL PROCESSING, LIGHT SCATTERING, BRAGG SCATTERING, BRAGG ANGLE

Subject Categories : Electrical and Electronic Equipment
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE