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Distributed strain measurement with millimeter-order spatial resolution based on Brillouin optical correlation domain analysis

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Abstract

Distributed strain sensing with millimeter-order spatial resolution is demonstrated in optical fibers based on Brillouin optical correlation domain analysis. A novel beat lock-in detection scheme is introduced to suppress background noises coming from the reflection of Brillouin pump waves. The Brillouin frequency shifts of 3mm fiber sections are successfully measured with a theoretical spatial resolution of 1.6mm.

© 2006 Optical Society of America

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