Fiber optic security seal including plural Bragg gratings

Patent · Sat Jan 01 04:00:00 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
• 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

/385/250/356/359/
bragg
bragg gratings
container
core
corresponds
domain
domain reflectometer
enables
fiber
fiber optic
frequencies
frequency
functionally
functionally related
grating
gratings
holographically
incident
incident light
including
integrity
interrogated
light
light output
location
optic
optical
optical fiber
output
placed
plural
plurality
predetermined
predetermined location
provided
reflecting
reflectometer
related
remotely
seal
seal including
security
security seal
signal
time
time domain
variable
variable frequency
written