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Proceedings Paper

Distributed fiber-optic sensing system with OFDR and its applications to structural health monitoring
Author(s): H. Murayama; K. Kageyama; K. Uzawa; H. Igawa; K. Omichi; Y. Machijima
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Paper Abstract

In the field of fiber-optic sensing technology, distributed sensors that return a value of the measurand as a function of linear position along an optical fiber are regarded as a promising sensor which can be applied to structural health monitoring (SHM). We have developed a distributed strain sensing technique using long gauge fiber Bragg grating (FBG) based on optical frequency domain reflectometry (OFDR). FBGs functioning as mirrors with wavelengthselective reflectivity have been used as strain or temperature sensors. OFDR is a technique designed to measure backreflections from optical fiber networks and components. In our system, we use a longer gauge FBG whose length is ordinarily more than 100 mm and we can measure strain at an arbitrary position along the FBG. Therefore, we can obtain continuous strain data along the FBG. Furthermore, since the spatial resolution in strain measurements is less than 1 mm, it enables us to measure the strain distribution of stress concentrated area, such as welded and bonded joints, precisely. In this paper, we describe the principle of the distributed sensing technique based on OFDR and the applications to strain monitoring of a bonded joint and a wing box structure.

Paper Details

Date Published: 20 October 2009
PDF: 8 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930E (20 October 2009); doi: 10.1117/12.840397
Show Author Affiliations
H. Murayama, The Univ. of Tokyo (Japan)
K. Kageyama, The Univ. of Tokyo (Japan)
K. Uzawa, The Univ. of Tokyo (Japan)
H. Igawa, Japan Aerospace Exploration Agency (Japan)
K. Omichi, Fujikura, Ltd. (Japan)
Y. Machijima, Lazoc, Inc. (Japan)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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