Original Article
  • Spectrum Characteristics and Stress Induced Birefringence of Fiber Bragg Grating Embedded into Composite Laminates
  • Jung-Ryul Lee, Chun-Gon Kim, Chang-Sun Hong
  • 복합재 평판에 삽입된 광섬유 브래그 격자의 스펙트럼특성과 응력유도복굴절
  • 이정률(Mechanical and Materials Engineering Department, SMS division, Ecole Nationale Superieure des Mines de Saint Etienne, France.), 김천곤(Author to whom correspondence should addressed), 홍창선(Department of Mechanical Engineering, Division of Aerospace Engineering, Korea Advanced Institute of Science and Technology(KAIST))
Abstract
Fiber Bragg grating(FBG) like other optical fiber sensor 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 embbed optical fibers visualized the embedding environments of stripped optical fibers and coated optical fibers. Based on these microphotographs and cure monitoring perfomed using FBGs, we could understand that the main cause breaking the unique Bragg condition of low-birefrigence FBG were residual stress after curing and reported the state 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.

Fiber Bragg grating(FBG) like other optical fiber sensor 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 embbed optical fibers visualized the embedding environments of stripped optical fibers and coated optical fibers. Based on these microphotographs and cure monitoring perfomed using FBGs, we could understand that the main cause breaking the unique Bragg condition of low-birefrigence FBG were residual stress after curing and reported the state 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.

This Article

  • 2002; 15(3): 30-38

    Published on Jun 30, 2002