Dynamic Monitoring Of Fan Blade Using High Resolution, Distributed Fiber Optic Sensing
Short Summary
This paper presents the results of a dynamic test of a composite fan blade, in which strain measurements from a two meter long distributed fiber optic sensor is updated at the fast rate of 250 Hz. Besides tracking high frequency dynamic events, the truly distributed nature of these high resolution measurements also facilitate the calculation of fan blade mode shapes.
Abstract
This paper presents the results of a dynamic test of a composite fan blade, in which strain measurements from a two meter long distributed fiber optic sensor is updated at the fast rate of 250 Hz. Besides tracking high frequency dynamic events, the truly distributed nature of these high resolution measurements also facilitate the calculation of fan blade mode shapes. The technology that enables this is based on Optical Frequency Domain Reflectometry (OFDR), which uses the Rayleigh backscatter signal to convert a standard off-the-shelf optical fiber into a distributed fiber optic strain sensor. This technique enables a cradle-to-grave, full-field measurement of composite structural health. Recent work using the OFDR sensing technique has shown high accuracy strain measurements with spatial resolutions on the order of a few millimeters. This work presents data with equal quality, but which has been taken with an update rate that is over twice that which has been previously reported.
Citation
"N. A. A. Rahim et. al., “Dynamic Monitoring Of Fan Blade Using High Resolution, Distributed Fiber Optic Sensing,"" 45th ISTC, SAMPE Tech. Conf. Proc., Wichita, KS, 2013. "
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