Fiber optic security seal including plural Bragg gratings

Patent · Tue Sep 27 00:00:00 EDT 1994

OSTI ID:6903308

Forman, P R

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.

• DOE Contract Number: W-7405-ENG-36
• Assignee: Univ. of California, Alameda, CA (United States)
• Patent Number(s): US 5351324; A
• Application Number: PPN: US 8-120113
• OSTI ID: 6903308
• Country of Publication: United States
• Language: English

Related Subjects

055001* -- Nuclear Fuels-- Safeguards
Inspection
& Accountability-- Technical Aspects
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
BRAGG REFLECTION
CONTAINERS
DESIGN
DIFFRACTION GRATINGS
FIBERS
GRATINGS
HOLOGRAPHY
OPERATION
OPTICAL FIBERS
PHYSICAL PROTECTION DEVICES
REFLECTION
SEALS
SECURITY SEALS