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Proceedings Paper

Polyimide-coated small-diameter optical fiber sensors for embedding in composite laminate structures
Author(s): Kouji Satori; Keisuke Fukuchi; Yoshinori Kurosawa; Akihito Hongo; Nobuo Takeda
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Paper Abstract

We have studied health-monitoring systems using embedded optical fiber sensors for damage detection in FRP (Fiber Reinforced Plastics) composite laminates. For sensing of strain or temperature changes in these composite materials, we developed the FBG (Fiber Bragg Grating) sensors using the polyimide-coated small-diameter optical fiber with cladding diameter of 40 micrometers , which can be embedded in FRP composite laminates without inducing any structural defects. The FBG was subjected to high-temperature heat treatment at 300 degree(s)C in order to suppress the optical characteristics change of the FBG over a long period of time. Even after such high temperature treatment, the FBG retained sufficient mechanical strength and reflectivity. We embedded the FBG into FRP composite laminates and measured the optical characteristics against temperature and tensile strain. These experimental results show this type of the embedded FBG is very promising for practical health-monitoring systems. In addition, we have investigated various multipoint measuring systems and propose the time division multiplexing system using these FBG sensors.

Paper Details

Date Published: 6 August 2001
PDF: 10 pages
Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); doi: 10.1117/12.435531
Show Author Affiliations
Kouji Satori, Hitachi Cable, Ltd. (Japan)
Keisuke Fukuchi, Hitachi Cable, Ltd. (Japan)
Yoshinori Kurosawa, Hitachi Cable, Ltd. (Japan)
Akihito Hongo, Hitachi Cable, Ltd. (Japan)
Nobuo Takeda, Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 4328:
Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Eric Udd; Daniele Inaudi, Editor(s)

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