Accession Number : ADD015697

Title :   Fiber Grating-Based Sensing System with Interferometric Wavelength-Shift Detection.

Descriptive Note : Patent Application, Filed 4 Nov 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kersey, Alan D ; Berkoff, T A

Report Date : 04 Nov 1992

Pagination or Media Count : 32

Abstract : A typical fiber grating-based strain sensing system for sensing a measurand field according to the prior art comprises an optical source for providing broadband light to an array of serially coupled sensor elements. Each sensor element returns an optical signal having a narrow-band wavelength component, the wavelength depending by a known functional relation on the measurand field being sensed. The measurand field is a particular environmental condition or physical phenomenon under consideration. In other words, perturbation of that condition or phenomenon at element results in a change of the wavelength of optical signal. The array combines the individual signals, such as by wavelength-division or time-division multiplexing, to produce a composite return signal having a plurality of components, each uniquely corresponding to a signal from an individual sensor element.

Descriptors :   *PATENT APPLICATIONS, *OPTICAL DETECTORS, *SIGNAL PROCESSING, *OPTICAL INTERFEROMETERS, ARRAYS, BROADBAND, DETECTION, FIBERS, LIGHT, MULTIPLEXING, PERTURBATIONS, SIGNALS, TIME DIVISION MULTIPLEXING, STRAIN GAGES, FIBER OPTICS, REFRACTIVE INDEX, PHASE MODULATION

Subject Categories : Optical Detection and Detectors
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE