Abstract
A passive measurement system using fiber Bragg gratings is presented to interrogate the health of an instrumented part. Estimation of the structures Green’s function from diffuse sound fields present during typical operating conditions is the basis for our approach. Experimental studies are conducted using coherent processing techniques of random and generated sound fields to investigate a structure for defects and/or deviations from an initial or pristine state. We are interested in developing a monitoring process that is minimally invasive and robust enough to survive the environment that the structure operates in and provide a quantitative assessment of the structure throughout its lifetime.
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