Cargo container security system communications
First Claim
1. A cargo container security system comprising:
- at least one enclosure surface substantially enclosing a volumetric space of the cargo container;
a continuous optical fiber disposed in the at least one enclosure surface to define an optical fiber path extending across substantially an entire area of the at least one enclosure surface, the optical fiber comprising material with at least one optical characteristic that irreversibly changes when exposed to one or more types of radiation;
a light source optically coupled to one end of the optical fiber path for introducing light into the optical fiber path;
a light detector optically coupled to an other end of the optical fiber path for receiving light from the optical fiber path;
a circuit connected to the light detector and operative to detect a change in the at least one optical characteristic as a function of the light received at the light detector from the optical fiber path and to provide an alarm signal as a function of the detected change; and
a transmitter operative to receive the alarm signal and in response thereto to transmit an alarm notification to a receiver system.
4 Assignments
0 Petitions
Accused Products
Abstract
A system and method for detecting radiation from a source in a container is disclosed. A continuous optical fiber path is disposed in a medium which is part of or associated with a container and which encloses the volumetric space of the container. The optical fiber path provides a volumetric mass of optical fiber which is reactive to radiation from a radiation source in the container to cause an irreversible change in the light carrying capacity or other characteristic of the optical fiber. A light source is coupled to one end of the optical fiber path for introducing light having a predetermined characteristic. A light detector is coupled to the other end of the optical path for receiving light from the optical path. A circuit is coupled to the light detector and is operative to detect a total loss of light or a change in the predetermined characteristic of the light and to provide an alarm indication thereof. The alarm indication can be transmitted to one or more receiving sites via communications paths which can include existing communications networks.
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Citations
45 Claims
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1. A cargo container security system comprising:
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at least one enclosure surface substantially enclosing a volumetric space of the cargo container; a continuous optical fiber disposed in the at least one enclosure surface to define an optical fiber path extending across substantially an entire area of the at least one enclosure surface, the optical fiber comprising material with at least one optical characteristic that irreversibly changes when exposed to one or more types of radiation; a light source optically coupled to one end of the optical fiber path for introducing light into the optical fiber path; a light detector optically coupled to an other end of the optical fiber path for receiving light from the optical fiber path; a circuit connected to the light detector and operative to detect a change in the at least one optical characteristic as a function of the light received at the light detector from the optical fiber path and to provide an alarm signal as a function of the detected change; and a transmitter operative to receive the alarm signal and in response thereto to transmit an alarm notification to a receiver system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A security system for a multisided container, comprising:
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a plurality of liner panels, each sized to line an interior wall of a respective side of the container to substantially enclose a volumetric space of the container; each of the liner panels having an optical fiber extending in a path across substantially an entire area of the panel, each optical fiber having a first end and a second end; each optical fiber configured such that exposure to a nuclear radiation causes an irreversible decrease in light-carrying capacity of the optical fiber; one or more of the optical fibers of the plurality of liner panels coupled to another optical fiber to provide one or more optical paths through the plurality of liner panels; a light source for providing light to the one or more optical paths; a light detector for receiving light from the light source through the one or more optical paths; a circuit connected to the light detector and operative to detect a change in the light-carrying capacity of the one or more optical paths as a function of an amount of light received at the light detector and to provide a signal indication as a function of the detected change in light-carrying capacity; and a transmitter providing an alarm notification to a receiver system in response to the signal indication from the circuit. - View Dependent Claims (23, 24, 25)
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26. A security system for a container, the system comprising:
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a medium having a first area, the medium configured to substantially enclose a volumetric space of the container; an optical fiber disposed in the medium and extending in a first path across substantially the entire first area of the medium, the optical fiber having a first end and a second end, and the optical fiber configured such that exposure to radiation causes an irreversible change in one or more optical characteristics of the optical fiber; a wire disposed in the medium and extending in a second path across substantially the entire first area of the medium, the wire having first and second wire ends; a first detector circuit coupled to the optical fiber and configured to measure one or more optical characteristics of the optical fiber, and when one or more of the measured optical characteristics is not within a predetermined range, output a first signal; a second detector circuit coupled to the wire and configured to detect electrical continuity of the wire from the first wire end to the second wire end, and when a loss of electrical continuity is detected, output a second signal; and a transmitter configured to transmit an alarm notification upon occurrence of at least one of;
the first signal and the second signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45)
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43. A security system for a container, the system comprising:
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a medium having a first area, the medium configured to substantially enclose a volumetric space of the container; at least one signal path disposed in the medium and extending across substantially the entire first area of the medium, the at least one signal path having a first end and a second end; at least one continuity detector coupled to the at least one signal path and configured to detect continuity of a signal in the signal path from the first end to the second end, and when a loss of signal continuity is detected, output a first signal; and a transmitter coupled to the at least one continuity detector and configured to transmit an alarm notification upon occurrence of the first signal; wherein the at least one signal path comprises at least one of; an optical fiber configured to carry a light signal and comprising material such that exposure to radiation causes an irreversible change in one or more optical characteristics of the optical fiber; and a wire configured to conduct an electrical signal.
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Specification