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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. 2 figs.
Inventors:
Issue Date:
OSTI Identifier:
6903308
Assignee:
Univ. of California, Alameda, CA (United States) PTO; EDB-94-150500
Patent Number(s):
US 5351324; A
Application Number:
PPN: US 8-120113
Contract Number:
W-7405-ENG-36
Resource Relation:
Patent File Date: 10 Sep 1993
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; CONTAINERS; SECURITY SEALS; DESIGN; BRAGG REFLECTION; DIFFRACTION GRATINGS; HOLOGRAPHY; OPERATION; OPTICAL FIBERS; FIBERS; GRATINGS; PHYSICAL PROTECTION DEVICES; REFLECTION; SEALS 055001* -- Nuclear Fuels-- Safeguards, Inspection, & Accountability-- Technical Aspects