Distributed Fiber-Optic Sensors Based on Light Scattering in Optical Fibers

Authored by: Xiaoyi Bao , Wenhai Li , Chen Liang

Handbook of Optical Sensors

Print publication date:  October  2014
Online publication date:  October  2014

Print ISBN: 9781439866856
eBook ISBN: 9781439866863
Adobe ISBN:

10.1201/b17641-20

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Abstract

Distributed fiber optic sensor technology is one of the most promising candidates among the numerous sensor technologies that are adopted for structural health monitoring (SHM) (Measures 2001). This is due to its inherent fiber-optic properties such as light in weight, small in size, noncorrosive, and the immunity to electromagnetic (EM) interference (Kersey 1996). Distributed fiber-optic sensors can be used to measure the physical property changes at any position along a single optical fiber, with a gauge length of 2 m over hundreds of kilometers sensing length (Bao and Chen 2011). The state-of-the-art technology for distributed strain measurement is 1–2 cm with sensing length of a few kilometers using the Brillouin scattering mechanism (Foaleng et al. 2010, Dong et al. 2012). In applications where monitoring is required at a large number of points on a large structure, distributed fiber-optic sensors provide particularly attractive solutions as cost- and space-effective tool.

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