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Optical Fiber Sensing: OTDR and Polarimetry to Design a Warning System for Debris Flows and Snow Avalanches

Nicolas Rotundo

Optical Fiber Sensing: OTDR and Polarimetry to Design a Warning System for Debris Flows and Snow Avalanches.

Rel. Roberto Gaudino, Giuseppe Rizzelli Martella. Politecnico di Torino, Corso di laurea magistrale in Communications And Computer Networks Engineering (Ingegneria Telematica E Delle Comunicazioni), 2019

Abstract:

Optical fiber sensors are sensors that monitor variations of the physical parameters through an optical fiber that is the sensor itself, in particular Distributed Optical Fiber Sensors (DOFSs) provide spatial continuity along the whole length of the optical fiber. Sensing systems of this kind gain all the properties and all the advantages of optical fibers and are specifically indicated for monitoring of big structures and natural environments. The measurement of the backscattered light and the analysis of the evolution of changes in polarization over time are the concepts studied in this thesis, with the purpose of designing an optical fiber sensor that is able to send out an alarm signal with the occurrence of debris flows and snow avalanches in mountain environments. The focus is on the construction of an OTDR sensor that exploits a highly coherent laser as input and a coherent receiver, the phase noise characterization of the input laser in this situation, and the construction of a sensor based on a polarimeter. Performance of these experimental setups have been evaluated in laboratory and in a real site, by the acquisition of final output traces from the involved instruments and their post-processing.

Relatori: Roberto Gaudino, Giuseppe Rizzelli Martella
Anno accademico: 2019/20
Tipo di pubblicazione: Elettronica
Numero di pagine: 99
Informazioni aggiuntive: Tesi secretata. Fulltext non presente
Soggetti:
Corso di laurea: Corso di laurea magistrale in Communications And Computer Networks Engineering (Ingegneria Telematica E Delle Comunicazioni)
Classe di laurea: Nuovo ordinamento > Laurea magistrale > LM-27 - INGEGNERIA DELLE TELECOMUNICAZIONI
Aziende collaboratrici: NON SPECIFICATO
URI: http://webthesis.biblio.polito.it/id/eprint/12577
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