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Proceedings Paper

Correlation-based continuous-wave techniques for fiber optic distributed sensing with a high spatial resolution
Author(s): Kazuo Hotate
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Paper Abstract

We have proposed and developed a technique to synthesize optical coherence function into arbitrary shapes. By using the technique, Synthesis of Optical Coherence Function, distributed sensing schemes can be provided without any mechanical moving parts nor calculation. Applying the technique, we have proposed and studied a scheme to diagnose fiber optic subscribe networks. Fiber optic distributed stress sensing systems have also been constructed, which are applicable to smart structures and security systems. By also applying a similar way, we have proposed a system to measure the strain distribution along an optical fiber through the Brillouin scattering caused in the fiber. In all the schemes, we do not use a pulsed-lightwave but use a continuous-wave, whose correlation is controlled by FM or PM modulation onto lightwaves, to have the distributed sensing function. By these correlation-based continuous-wave techniques, quite a high spatial resolution and other superior functions to the pulsed-lightwave technique have been realized. These systems can achieve a cm order spatial resolution, which is suitable for smart materials.

Paper Details

Date Published: 14 February 2002
PDF: 11 pages
Proc. SPIE 4578, Fiber Optic Sensor Technology and Applications 2001, (14 February 2002); doi: 10.1117/12.456086
Show Author Affiliations
Kazuo Hotate, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 4578:
Fiber Optic Sensor Technology and Applications 2001
Michael A. Marcus; Brian Culshaw, Editor(s)

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