Distributed sensing with OFDR and its application to structural health monitoring | Zendy

Hideaki Murayama | Zendy; Hirotaka Igawa | Zendy; Koji Omichi | Zendy; Yuichi Machijima | Zendy

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Distributed sensing with OFDR and its application to structural health monitoring

Author(s) -

Hideaki Murayama,

Hirotaka Igawa,

Koji Omichi,

Yuichi Machijima

Publication year - 2011

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.886028

Subject(s) - reflectometry , structural health monitoring , distributed acoustic sensing , fiber bragg grating , optical fiber , fiber optic sensor , optics , materials science , optical time domain reflectometer , fiber , computer science , polarization maintaining optical fiber , time domain , physics , composite material , computer vision

Optical fiber sensors are promised candidates as sensor elements in structural health monitoring (SHM). Especially fiber-optic distributed strain sensors that return a strain value as a function of linear position along an optical fiber have been attractive for people in the field of SHM. We have developed a distributed strain sensing system using long-length fiber Bragg gratings (FBGs), based on optical frequency domain reflectometry (OFDR). We employ long-length FBGs whose length is about 100 mm and the sensing region, in other words the gauge length, can be expanded up to more than 1 m by serially-cascaded long-length FBGs. This sensing system has the high spatial resolution of less than 1 mm. In this paper the distributed sensing system with OFDR and its application to SHM are described.

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