Method and apparatus using polarisation optical time domain reflectometry for security applications
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United States of America Patent
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Feb 6, 2007
Grant Date -
Jan 6, 2005
app pub date -
Jul 3, 2003
filing date -
Jul 3, 2003
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Abstract
A preferred apparatus and method is presented in which a distributed fiber optic sensor is used in order to detect a disturbance along its length. A pulse of polarized light is launched into an optical fiber; as the pulse propagates along the optical fiber, it continuously loses a small portion of its energy due to Rayleigh backscatter. The Rayleigh backscattered light is analyzed using a polarization sensitive element such as a fiber polarizer. The dynamics of the time dependence of the polarization analyzed backscattered light is used to ascertain if there has been a disturbance along the length of the optical fiber. This technique can be used for applications in areas such as fiber optic telecommunications, perimeter security, fire detection, and pipelines.
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