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Coherent Fiber-Optic Sensor for Ultra-Acoustic Crack Emissions
Ilaria Di Luch1, Maddalena Ferrario2, Davide Fumagalli3
1Dipartimento di Elettronica, Informazione e Biomedica, Politecnico di Milano, 20133 Milano, Italy.
Abstract:
A coherent optical fiber sensor with adequate sensitivity for detecting the acoustic emission (AE) during the propagation of a crack in a ferrous material is presented. The proposed fiber optic sensor is successfully compared in terms of the SNR (Signal to Noise Ratio) and detectable AE energy levels to commercially available AE piezo-transducers sensors and is proven to be an effective and advantageous alternative for sensing and monitoring fatigue damage in structural applications.
