13 May 2013 High-frequency optical fiber microphone for condition-based maintenance application
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A low-cost optical fiber Bragg grating-based microphone is presented. The sensing system makes use of an intensitybased interrogation approach, with a fixed-wavelength laser source employed as optical source. The optical sensor is complemented by signal processing, consisting of adaptive filters and a Capon power spectral density estimator. System characterization has been carried out, showing maximum sensitivity in the 120-450 Hz range, with 0.45 Hz repeatability on single-tone detection. Application for condition-based maintenance of industrial plants, based on a simulated model, is discussed.
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Daniele Tosi, Daniele Tosi, Massimo Olivero, Massimo Olivero, Guido Perrone, Guido Perrone, Alberto Vallan, Alberto Vallan, "High-frequency optical fiber microphone for condition-based maintenance application", Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87880Z (13 May 2013); doi: 10.1117/12.2019249; https://doi.org/10.1117/12.2019249

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