Published in
OFS2012 22nd International Conference on Optical Fiber Sensors
DOI: 10.1117/12.975142
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Analysis of fiber optic sensor application to precursory acoustic signals detection in rockfall events
,
L. Palmieri,
L. Vianello,
G. Marcato,
G. Gruca,
T. van de Watering,
D. Iannuzzi,
A. Pasuto ,
A. Galtarossa
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Abstract
Two fiber optic sensors (FOSs) for detection of precursory acoustic emissions in rockfall events are proposed and experimentally characterized. While both sensors are interferometric, the first one use a fiber coil as sensing element, whereas the second sensor exploits a micro-machined cantilever carved on the top of a ferrule. Preliminary experimental comparison with standard piezo-electric transducers shows the viability of such FOSs for acoustic emission monitoring in rock masses.