Full spectral interrogation of fiber Bragg grating sensors for measurements of damage during steady-state vibration

S. Webb; K. Peters; M. A. Zikry; S. Chadderdon; R. Selfridge; S. Schultz

doi:10.1117/12.915150

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30 March 2012 Full spectral interrogation of fiber Bragg grating sensors for measurements of damage during steady-state vibration

S. Webb, K. Peters, M. A. Zikry, S. Chadderdon, R. Selfridge, S. Schultz

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Proceedings Volume 8346, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2012; 83460C (2012) https://doi.org/10.1117/12.915150
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

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. During steady-state vibration, the behavior of the spectral shape of the FBG reflection varies depending on the extent of non-uniform strain. 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, K. Peters, M. A. Zikry, S. Chadderdon, R. Selfridge, and S. Schultz "Full spectral interrogation of fiber Bragg grating sensors for measurements of damage during steady-state vibration", Proc. SPIE 8346, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2012, 83460C (30 March 2012); https://doi.org/10.1117/12.915150

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