Accession Number:

ADD019122

Title:

Methods and apparatus for Distributed Optical Fiber Sensing of Strain or Multiple Parameters

Descriptive Note:

Patent, Filed 30 Jan 97, patented 26 May 98

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1998-05-26

Pagination or Media Count:

12.0

Abstract:

A distributed optical fiber sensor system including a patterned array of weakly reflecting broadband gratings or other sensors serially disposed along a common fiber. The laser sources are multiplexed onto the fiber and are propagated through a directional coupler toward the sensors. The return signals are directed by the directional coupler to a demultiplexer that separates the signals by center frequencies and sends each to a respective detector. All reflection signals generated by a single input pulse of a given wavelength are detected prior to the input coupling of the next input pulse of that wavelength, the input pulse repetition period being T greater than or equal Nto, N being the number of grating sensors and to being their spacing or separation in optical propagation time.

Subject Categories:

  • Optical Detection and Detectors
  • Fiber Optics and Integrated Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE