2012 article

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

SMART SENSOR PHENOMENA, TECHNOLOGY, NETWORKS, AND SYSTEMS INTEGRATION 2012, Vol. 8346.

By: S. Webb n, K. Peters n , M. Zikry n , S. Chadderdon*, S. Nikola, R. Selfridge*, S. Schultz *

co-author countries: United States of America πŸ‡ΊπŸ‡Έ
author keywords: fiber Bragg grating sensors; non-uniform strain; full spectral interrogation; vibration monitoring
Source: Web Of Science
Added: August 6, 2018

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.