Method and apparatus for active tamper indicating device using optical time-domain reflectometry
Patent
·
OSTI ID:872760
- Oak Ridge, TN
- Lenoir City, TN
- Clinton, TN
- Knoxville, TX
An optical time-domain reflectometer (OTDR) launches pulses of light into a link or a system of multiplexed links and records the waveform of pulses reflected by the seals in the link(s). If a seal is opened, the link of cables will become a discontinuous transmitter of the light pulses and the OTDR can immediately detect that a seal has been opened. By analyzing the waveform, the OTDR can also quickly determine which seal(s) were opened. In this way the invention functions as a system of active seals. The invention is intended for applications that require long-term surveillance of a large number of closures. It provides immediate tamper detection, allows for periodic access to secured closures, and can be configured for many different distributions of closures. It can monitor closures in indoor and outdoor locations and it can monitor containers or groups of containers located many kilometers apart.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
- Assignee:
- Lockheed Martin Energy Research Corp. (Oak Ridge, TN)
- Patent Number(s):
- US 6002501
- OSTI ID:
- 872760
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/359/356/
access
active
allows
analyzing
apart
apparatus
applications
cables
closures
configured
containers
detect
detection
determine
device
discontinuous
distributions
domain reflectometer
domain reflectometry
functions
immediate
immediately
indicating
indicating device
indoor
intended
kilometers
launches
light
light pulse
light pulses
link
links
located
locations
long-term
method
monitor
multiplexed
optical
optical time
optical time-domain
otdr
outdoor
periodic
provides
pulses
pulses reflected
quickly
quickly determine
records
reflected
reflectometer
reflectometry
require
seal
seals
secured
surveillance
tamper
time-domain
transmitter
waveform
access
active
allows
analyzing
apart
apparatus
applications
cables
closures
configured
containers
detect
detection
determine
device
discontinuous
distributions
domain reflectometer
domain reflectometry
functions
immediate
immediately
indicating
indicating device
indoor
intended
kilometers
launches
light
light pulse
light pulses
link
links
located
locations
long-term
method
monitor
multiplexed
optical
optical time
optical time-domain
otdr
outdoor
periodic
provides
pulses
pulses reflected
quickly
quickly determine
records
reflected
reflectometer
reflectometry
require
seal
seals
secured
surveillance
tamper
time-domain
transmitter
waveform