Fiber optic security seal including plural Bragg gratings

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869522

Forman, Peter R ^[1]

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1. Los Alamos, NM

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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• Assignee: Regents of University of California, Office of Technology (Alameda, CA)
• Patent Number(s): US 5351324
• OSTI ID: 869522
• Country of Publication: United States
• Language: English

Related Subjects

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/