Fiber Optic Sensor with improved sensitivity for acoustic detection of rockfalls

Luca Schenato (a), Luca Palmieri (b), Gianluca Marcato (a), Andrea Galtarossa (b,c) & Alessandro Pasuto (a)
(a) Research Institute for Geo-Hydrological Protection, National Research Council, Corso Stati Uniti, 4, 35127, Padova, Italy. E-mail: luca.schenato@cnr.it (b) Department of Information Engineering, University of Padova, Via Gradenigo, 6/A, 35131, Padova, Italy. (c) International Institute for Urban Systems Engineering, Southeast University, Nanjing, China.

This short note summarizes the activity about the development and optimization of a fiber optic sensor for ultrasonic acoustic sensing to the aim of rockfall detection. The sensor is described and its viability to rockfall is discussed and experimentally validated. An improved design of the sensor, with double responsivity, is also proposed.

crack monitoring , Fiber Optic Sensor, rockfall.