Full-spectrum FBG analysis of inhomogeneous, fast-varying strain effects

Kara Peters

doi:10.1117/12.916010

30 January 2012 Full-spectrum FBG analysis of inhomogeneous, fast-varying strain effects

Kara Peters

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 835110 (2012) https://doi.org/10.1117/12.916010
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

Embedded sensors provide a high sensitivity to sub-surface damage due to their proximity to the damage features. In particular, fiber Bragg gratings (FBG) are easily embedded into laminates with a minimum of perturbation to the surrounding material microstructure. In this paper we summarize some recent advances derived from full-spectral interrogation of FBG sensors for structural health monitoring and damage identification in composites. In particular we present signals from the FBG reflected spectra that have been correlated to the progression of delamination due to multiple low-velocity impacts in woven composite laminates and foam-core sandwich composites. We also discuss recent advances in interrogation systems for these sensors which have permitted dynamic evaluation of these parameters. Finally, spectral distortion can lead to errors in the interpretation of strain values from the peak wavelength measurement when peak waveforms are assumed. We demonstrate that full-spectral interrogation can provide sensor specific error compensation for these measurements.

Citation Download Citation

Kara Peters "Full-spectrum FBG analysis of inhomogeneous, fast-varying strain effects", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 835110 (30 January 2012); https://doi.org/10.1117/12.916010

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