Kahandawa, G. C. and Epaarachchi, J. A. and Wang, H. (2011) Identification of distortions to FBG spectrum using FBG fixed filters. In: ICCM18: Composite Materials: Key to the Future, 21-26 Aug 2011, Jeju, Korea.
Recent advances in fibre optic sensor technologies have provided great opportunities to develop more sophisticated in-situ SHM systems. There have been a large number of research reports on health monitoring of composite structures using Fibre Bragg Grating (FBG) sensors. Distortion of FBG sensors has been successfully used by many researchers to identify damage and to locate damage in composite structures . Observations of the distorted sensor spectrums due to stress concentrations caused by delaminations and cracks, have been using to estimate the damage conditions. The majority of the research works were focused on the investigation of the spectra of a FBG sensor embedded in the vicinity of a damage, in order to detect and identify the damage by relating to the distortion of the FBG sensor spectra. However the cause of the distortion of FBG spectra not only depends on the consequences of accumulated damage but also loading types and the fibre orientation. Embedding FBG’s in-between non parallel fibre layers and the application of torque have caused substantial distortions to the FBG spectra . A reference FBG spectra needs to be incorporated to FBG measurements to identify the variations to the FBG spectrum and to distinguish the other effects causing distortions. For this purpose, a fixed FBG based system was developed to measure the reflected FBG spectra in time domain. The fixed FBG method was used to estimate the peak using non distorted FBG spectra previously . Unfortunately there was no work done on the identification of distortions of FBG spectra using fixed FBG sensors. This paper details the research work performed to identify distortions of reflected spectra of an embedded FBG sensors inside a composite laminate. The developed method will provide the flexibility of input FBG time domain data directly to post processing algorithms for decoding and damage identification.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||Copyright Statement: Copyright of the text and illustrations of this paper to be published in the Proceedings of the Eighteenth International Conference on Composite Materials is hereby transferred to the publishers: The Korean Society for Composite Materials, Seoul, Korea. The publishers agree that the authors retain the right to use the substance of the paper in future works, including lectures, press releases and reviews, provided that the usual acknowledgements are made regarding copyright, the original reference and the publishers. Should the paper not be published for any reason, then the copyright reverts to the authors.|
|Uncontrolled Keywords:||FBG sensors; composite materials; structural health monitoring; fibre Bragg grating sensors|
|Depositing User:||Dr Gayan Chanaka Kahandawa Appuhamillage|
|Date Deposited:||12 Apr 2012 01:55|
|Last Modified:||03 Jul 2013 01:04|
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