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10th Scientific Meeting

The University of Porto SPIE Student Chapter will host another scientific meeting. This time the focus is on Optical Fiber Sensors, with Hugo Martins a PhD Student from the University of Porto.
When Jan 29, 2014
from 02:00 to 03:00
Where Room -117, FC3, FCUP - Departamento de Física e Astronomia
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Title: "Phase-sensitive optical time domain reflectometry for distributed vibration sensing along optical fibers" 

Abstract:
Phase-sensitive optical time domain reflectometry (ϕOTDR) is a simple and effective tool which allows the distributed monitoring of vibrations along conventional single-mode fibers and can be used to monitor intrusions over large perimeters. Unlike traditional OTDRs which can only measure intensity variations along the fiber, a ϕOTDR works by injecting a pulse of highly coherent light into a single-mode fiber and is therefore sensitive to the relative phases among the reflected fields coming from the different scattering centers. In this presentation the pump pulse evolution in a typical ϕOTDR setup is described. The ideal conditions of operation as well as physical and practical limitations are described. A field prototype is also presented.

About Hugo Martins:
Hugo F. Martins received the B.Sc. and M.Sc. degrees in physics from the University of Porto, Porto, Portugal, in 2009 and 2011, respectively. He is currently working toward the Ph.D. degree under jointly-awarded program in the University of Porto, Porto, Portugal and the University of Alcalá, Madrid, Spain.
During his M.Sc. dissertation work, he worked with INESC Porto in the development of fiber sensing applications using cooperative Rayleigh-Raman scattering. His current research interest are studying the possibility of using ultra-long fiber lasers based on distributed Rayleigh mirrors to obtain a new all-fiber secure key distribution system (while working in Porto, with INESC TEC) and distributed fiber sensors, mainly the use of phase-sensitive optical time domain reflectometry for distributed vibration detection (while working in the University of Alcalá).

INESC TEC - Laboratório Associado    Universidade do Porto  spie