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Spectrum Characteristics and Stress Induced Birefringence of Fiber Bragg Grating Embedded into Composite Laminates  

Lee, Jung-Ryul (Mechanical and materials Engineering Department, SMS division, Ecole Nationale Superieure des Mines de Saint Etienne)
Kim, Chun-Gon (Author to whom correspondence should addressed)
Hong, Chang-Sun (Department of Mechanical Engineering, Division of Aerospace Engineering, Korea Advanced Institute of Science and Technology(KAIST))
Publication Information
Composites Research / v.15, no.3, 2002 , pp. 30-38 More about this Journal
Abstract
Fiber Bragg grating(FBG) like other optical fiber sensors also has the merit of embedding capability. To increase their actual value related to embedding capability, this paper reported the reliability and signal characteristics of FBGS embedded in composite laminates. The microphotographs of embedded optical fibers visualized the embedding environments of stripped optical fibers and coated optical fibers. Based on these microphotographs and cure monitoring performed using FBGs, we could understand that the main cause breaking the unique Bragg condition of low-birefrigence FBG were residual stress artier curing and reported the stale of stress/strain of optical fiber quantitatively. The cure monitoring also showed the history of splitting peak of a stripped FBG along cure processing. In addition, we could obtain a transverse insensitive grating(TIG) with ease by recoating a stripped FBG. TIG has good advantage for real-time signal processing.
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