Correlation-Based Continuous-Wave Technique for Optical Fiber Distributed Strain Measurement Using Brillouin Scattering with cm-Order Spatial Resolution--Applications to Smart Materials--

Kazuo HOTATE  Masato TANAKA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.12   pp.1823-1828
Publication Date: 2001/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
Category: 
Keyword: 
fiber optic sensor,  Brillouin scattering,  strain,  spatial resolution,  smart material,  

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Summary: 
We summarize recent studies on performance improvement in the correlation-based continuous-wave technique for optical fiber distributed strain measurement using Brillouin scattering, that had been proposed previously. The correlation-based technique enables the spatial resolution of 1 cm, which is difficult for conventional sensing techniques using Brillouin scattering to achieve. Though the correlation-based technique left a problem with measurement range, we have proposed methods to overcome it with keeping high spatial resolution. In addition, we verified usefulness of the technique for smart materials by measuring strain distribution along surface of a ring structure.