18 May 2011 Fiber Bragg grating microphone system for condition-based maintenance of industrial facilities
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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77538B (2011); doi: 10.1117/12.884853
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada
Abstract
This paper presents a multipoint fiber Bragg grating (FBG) sensing system operating as a precision microphone. This instrument aims to become the best performing technology for condition-based maintenance (CBM) of critical elements, like ball bearings and cogwheels, embedded in industrial manufacturing machineries. The system architecture is based on the simple matched-laser principle, leading to a low-cost and high-sensitivity system, operating in time and wavelength multiplexing mode. Then, heavy signal processing is applied, providing an outstanding performance improvement of 59 dB in terms of signal-to-noise ratio. A demonstration of condition-based maintenance operation has been performed using standard models of ball bearing sound spectra. Compared to traditional microphones applied to CBM, the signal processing-powered FBG system provides remarkable advantages in terms of sensitivity and rejection of environment noise, providing an improvement of cost-effectiveness of CBM.
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D. Tosi, M. Olivero, G. Perrone, A. Vallan, "Fiber Bragg grating microphone system for condition-based maintenance of industrial facilities", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77538B (18 May 2011); doi: 10.1117/12.884853; https://doi.org/10.1117/12.884853
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KEYWORDS
Fiber Bragg gratings

Signal to noise ratio

Signal processing

Sensors

Filtering (signal processing)

Interference (communication)

Signal detection

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