6 August 2001 Polyimide-coated small-diameter optical fiber sensors for embedding in composite laminate structures
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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.
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Kouji Satori, Keisuke Fukuchi, Yoshinori Kurosawa, Akihito Hongo, Nobuo Takeda, "Polyimide-coated small-diameter optical fiber sensors for embedding in composite laminate structures", 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; https://doi.org/10.1117/12.435531
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KEYWORDS
Fiber Bragg gratings

Optical fibers

Heat treatments

Sensors

Composites

Hydrogen

Fiber reinforced polymers

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