Distributed sensing of microseisms and teleseisms with submarine dark fibers

Autor: Ethan F. Williams, María R. Fernández-Ruiz, Regina Magalhaes, Roel Vanthillo, Zhongwen Zhan, Miguel González-Herráez, Hugo F. Martins

Publikováno v: Nature Communications, Vol 10, Iss 1, Pp 1-11 (2019)

Distributed acoustic sensing (DAS) technology in geophysics is commonly known for applications such as active source seismic profiling in boreholes. Here, the authors convert the fiber optics cable into an ocean bottom seismic recording array with th

Externí odkaz: https://doaj.org/article/30fe48c4d1994fbab98c466d6e987aae

Fiber ring resonator using a cavity ring-down interrogation technique for curvature sensing

Autor: Orlando Frazão, Susana Silva, Regina Magalhães, Regina Magalhaes

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Microwave and Optical Technology Letters

In this work, it is demonstrated a fiber ring resonator connected to an interrogation system usually implemented on a cavity ring-down technique. A long-period grating (LPG) was inserted in the resonant cavity, being operated as a curvature sensor. T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b20dc96065cbe5f986cfd4e2b4a0cf0
http://repositorio.inesctec.pt/handle/123456789/7238

Curvature Sensor Based on a Long-Period Grating in a Fiber Ring Resonator Interrogated by an OTDR

Autor: Regina Magalhães, Susana Silva, Orlando Frazão

Publikováno v: Photonic Sensors, Vol 10, Iss 1, Pp 1-6 (2019)

Abstract The proposed technique demonstrates a fiber ring resonator interrogated by an optical time domain reflectometer (OTDR), for intensity sensing. By using this methodology, a cavity round trip time of 2.85 μs was obtained. For a proof of conce

Externí odkaz: https://doaj.org/article/58120a1bd3d746e1a2667a23b52dc6ac

Long-Range Distributed Solar Irradiance Sensing Using Optical Fibers

Autor: Regina Magalhães, Luis Costa, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, Alejandro F. Braña, Hugo F. Martins

Publikováno v: Sensors, Vol 20, Iss 3, p 908 (2020)

Until recently, the amount of solar irradiance reaching the Earth surface was considered to be a steady value over the years. However, there is increasing observational evidence showing that this quantity undergoes substantial variations over time, w

Externí odkaz: https://doaj.org/article/607926b5df554f92a329ab49d09b0e01

A crise da escola pública: o aprender a aprender

Autor: Regina Magalhães de Souza

Publikováno v: Plural, Vol 9 (2002)

Este trabalho teve como principal objetivo investigar que tipo de sujeito está sendo formado pela escola pública nos dias de hoje em que ocorrem profundas mudanças na cultura. A escola pública, em crise, ao mesmo tempo em que não tem conseguido

Externí odkaz: https://doaj.org/article/466157afe66f4d4dba760ec6b7a1d225