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Title: Fiber optic security seal including plural Bragg gratings

An optical security system enables the integrity of a container seal to be remotely interrogated. A plurality of Bragg gratings is written holographically into the core of at least one optical fiber placed about the container seal, where each Bragg grating has a predetermined location and a known frequency for reflecting incident light. A time domain reflectometer is provided with a variable frequency light output that corresponds to the reflecting frequencies of the Bragg gratings to output a signal that is functionally related to the location and reflecting frequency of each of the Bragg gratings.
  1. (Los Alamos, NM)
Issue Date:
OSTI Identifier:
Regents of University of California, Office of Technology (Alameda, CA) LANL
Patent Number(s):
US 5351324
Contract Number:
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
fiber; optic; security; seal; including; plural; bragg; gratings; optical; enables; integrity; container; remotely; interrogated; plurality; written; holographically; core; placed; grating; predetermined; location; frequency; reflecting; incident; light; time; domain; reflectometer; provided; variable; output; corresponds; frequencies; signal; functionally; related; security seal; incident light; functionally related; variable frequency; fiber optic; optical fiber; predetermined location; light output; time domain; seal including; bragg gratings; domain reflectometer; /385/250/356/359/