Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-06-30
1999-12-14
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359173, 359154, 356 731, 356 44, H04B 1008, H04B 1012, G01N 2100, G01J 548
Patent
active
060025018
ABSTRACT:
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.
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Barton Smith and Jeffrey Muhs, "OTDR.sub.-- Based Fiber Optic Seal Monitor for Material Control and Security," INMM Central Region Chapter Meeting, Lexington, Kentucky, Oct. 28, 1994, 2 pages.
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Earl D. Duncan
Muhs Jeffrey D.
Pickett Chris A.
Smith D. Barton
Chan Jason
Lockheed Martin Energy Research Corp.
Sedighian Mohammad
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