Development of small-diameter optical fiber sensors for damage detection in composite laminates

Kouji Satori; Yukio Ikeda; Yoshinori Kurosawa; Akihito Hongo; Nobuo Takeda

doi:10.1117/12.388097

12 June 2000 Development of small-diameter optical fiber sensors for damage detection in composite laminates

Kouji Satori, Yukio Ikeda, Yoshinori Kurosawa, Akihito Hongo, Nobuo Takeda

Proceedings Volume 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (2000) https://doi.org/10.1117/12.388097
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

Optical fiber sensor systems have been recently used for ,health monitoring of fiber reinforced plastic (FRP) composite laminate structures. However, the diameter of optical fibers for optical communication is normally 125 μm, which is similar to the thickness of one ply in FRP composite laminates. In order to embed optical fibers within one ply of FRP without introducing any defects in laminates, small- diameter optical fibers are necessary. The present paper describes development of small-diameter optical fiber sensors for damage detection in composite laminates. The coating diameter of the prototype small-diameter optical fiber is 52 μm, while the diameters of the cladding and the core are 40 μm and 8.5 μm, respectively. FBG (Fiber Bragg Grating) sensors were also fabricated with these fibers. Gratings were inscribed into the optical fiber by ultra-violet irradiation method. The wavelength shift and the response by strain of FBG itself were measured. The strain response, when small-diameter optical fiber and FBG sensors were embedded in composite laminates, were evaluated for practical application to detect the damage evolution.

Citation Download Citation

Kouji Satori, Yukio Ikeda, Yoshinori Kurosawa, Akihito Hongo, and Nobuo Takeda "Development of small-diameter optical fiber sensors for damage detection in composite laminates", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); https://doi.org/10.1117/12.388097

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