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An underground fiber optic fence

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Hank Hogan, [email protected]

Tunneling to circumvent borders could be a thing of the past, thanks to a fiber optic-based technique developed here. Researchers Dr. Assaf Klar and Dr. Raphael Linker of Technion, the Israel Institute of Technology, have devised a system that monitors buried fiber for the telltale soil displacements associated with tunneling activity. By monitoring tiny soil displacements along a fiber optic cable, researchers say they can detect tunneling performed by smugglers. Image courtesy of Technion, the Israel Institute of Technology. The technology can detect tunnels many feet below ground,...Read full article

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    Published: March 2009
    Glossary
    optical time-domain reflectometry
    A method for characterizing a fiber wherein an optical pulse is transmitted through the fiber, and the resulting light scattered and reflected to the input is measured (by an optical time-domain reflectometer, or OTDR) as a function of time.
    Brillouinfiber opticsoptical time-domain reflectometryResearch & TechnologyTech Pulse

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