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About

Recently got a Msc degree in Physics engineering, from Porto University. Currently works at Center of applied photonics at INESCTEC as recearch assistant. Current research lies on advanced Interrogation techniques for optical sensors based on microcavities; Development of low-cost interrogation systems for long-period fiber gratings(LPG) for corrosion sensing in metallic structures. Interrogation techniques using LPG or fiber Bragg gratings (FGB) for health assessment of concrete structures.

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Publications

2018

Real-time Early Warning Strategies for Corrosion Mitigation in Harsh Environments

Authors
Costa Coelho, LCC; Soares dos Santos, PSS; da Silva Jorge, PAD; Santos, JL; Marques Martins de Almeida, JMMM;

Publication
Journal of Lightwave Technology

Abstract
Long period fiber gratings (LPFGs) were coated with iron (Fe) and exposed to oxidation in air and in water having different concentrations of sodium chloride (NaCl) to detect the formation of iron oxides and hydroxides. The process was monitored in real time by measuring the characteristics of the LPFGs attenuation bands. Thin films of Fe were deposited on top of silica (SiO2) substrates, annealed in air, and exposed to water with NaCl. The composition of the oxide and hydroxide layers were analyzed by SEM/EDS and XRD. It was observed the formation of oxide phases, Fe3O4 (magnetite) and Fe2O3 (hematite) when annealing in air, and Fe2(OH)3Cl (hibbingite) and FeO(OH) (lepidocrocite) when exposed to water with NaCl. Results shows that Fe coated LPFGs can be used as sensors for real time monitoring of corrosion in offshore and in coastal projects where metal structures made of iron alloys are in contact with sea or brackish water. In addition, LPFGs coated with hematite were characterized for sensing, leading to the conclusion that the sensitivity to the refractive index of the surrounding medium can be tuned by proper choice of hematite thickness. IEEE

2018

Low-cost interrogation system for long period fiber gratings as sensing devices

Authors
Dos Santos, PSS; Jorge, PAS; De Almeida, JMMM; Coelho, L;

Publication
Optics InfoBase Conference Papers

Abstract
A system with fiber laser diodes and photodetector replaces the usual bulky and expensive systems for characterization of long period fiber gratings and high correlation is achieved when measuring refractive index, temperature and curvature. © OSA 2018 © 2018 The Author(s)