15 April 2011 Full-spectral interrogation of fiber Bragg grating sensors for damage identification
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In this study we evaluate the measurements of a fiber Bragg grating (FBG) sensor subjected to a non-uniform static strain state and simultaneously exposed to vibration loading. The full spectral response of the sensor is interrogated in reflection at 100 kHz during two loading cases: with and without an added vibration load spectrum. The static tensile loading is increased between each test, in order to increase the magnitude of the non-uniform strain field applied to the FBG sensor. The spectral distortion due to non-uniform strain is observed to change once the sensor is exposed to a non-transient 150 Hz vibration spectrum. With high-speed full spectral interrogation, it is potentially possible to separate this vibration-induced spectral change from spectral distortions due to non-uniform strain. Such spectral distortion contains valuable information on the static damage state of the surrounding host material.
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S. Webb, S. Webb, A. Noevere, A. Noevere, K. Peters, K. Peters, M. A. Zikry, M. A. Zikry, T. Vella, T. Vella, S. Chadderdon, S. Chadderdon, R. Selfridge, R. Selfridge, S. Schultz, S. Schultz, } "Full-spectral interrogation of fiber Bragg grating sensors for damage identification", Proc. SPIE 7982, Smart Sensor Phenomena, Technology, Networks, and Systems 2011, 79820C (15 April 2011); doi: 10.1117/12.881093; https://doi.org/10.1117/12.881093

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