Two fiber optic sensors (FOSs) for detection of precursory acoustic emissions in rockfall events are proposed and experimentally characterized. Both sensors are interferometric, but the first one is made of a fiber coil that acts as sensing element, whereas the second sensor exploits a micro-machined cantilever carved on the top of a ferrule. Preliminary experimental tests aimed at comparing the performance with standard piezo-electric transducers show the viability of such FOSs for acoustic emission monitoring in rock masses.
Fiber optic sensors for precursory acoustic signals detection in rockfall events: feasibility analysis
SCHENATO, LUCA;PALMIERI, LUCA;GALTAROSSA, ANDREA
2012
Abstract
Two fiber optic sensors (FOSs) for detection of precursory acoustic emissions in rockfall events are proposed and experimentally characterized. Both sensors are interferometric, but the first one is made of a fiber coil that acts as sensing element, whereas the second sensor exploits a micro-machined cantilever carved on the top of a ferrule. Preliminary experimental tests aimed at comparing the performance with standard piezo-electric transducers show the viability of such FOSs for acoustic emission monitoring in rock masses.
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