Publications

Publications by CAP

2018

Millimetric Water Level FBG interrogator Based on Wavelength Sweeping for Run-off River Hydroelectric Applications

Authors
Argentato, MC; Rosolem, JB; Floridia, C; Ferreira, EC;

Publication
26th International Conference on Optical Fiber Sensors

Abstract

2018

High Pressure FBG Sensor based on Compression Using a Single Point Attached Fiber in a Ferrule

Authors
Floridia, C; Cano, WFR; Rosolem, JB; Penze, RS; Dini, DC; Costa, EF; Peres, R; Bassan, FR; Teixeira, RAV; Vasconcelos, D;

Publication
26th International Conference on Optical Fiber Sensors

Abstract

2018

Field Test of a Single Attached Point FBG Pressure Sensor in a Thermoelectric Plant Engine

Authors
Rosolem, JB; Penze, RS; Floridia, C; Cano, WFR; Dini, DC; Costa, EF; Peres, R; Bassan, FR; Teixeira, RAV; Vasconcelos, D;

Publication
26th International Conference on Optical Fiber Sensors

Abstract

2018

FBG Interrogator based on Spectral Edge Optical Source

Authors
Florida, C; Rosolem, JB; Penze, RS; Costa, EF; Bassan, FR; Dini, DC; Teixeira, RAV;

Publication
26th International Conference on Optical Fiber Sensors

Abstract

2017

Monitoring of oxidation phases of copper thin films using long period fiber gratings

Authors
Coelho, L; Agostinho Moreira, JA; Tavares, PB; Santos, JL; Viegas, D; de Almeida, JMMM;

Publication
SENSORS AND ACTUATORS A-PHYSICAL

Abstract
Long period fiber gratings (LPFGs) were used to monitor the characteristics of copper (Cu) thin films when annealed in air atmosphere up to similar to 680 degrees C. The wavelength and the optical power shift of the resonant bands of the LPFGs when coated with the Cu thin films, were measured as a function of the annealing temperature, and were found to exhibit a different evolution comparing to a bare LPFGs. Thin films of Cu deposited on quartz (SiO2) substrates were annealed and analyzed by XRD, SEM/EDS and Raman spectroscopy, allowing to identify the formation of two distinct oxide phases at different temperatures, cuprous (Cu2O-cuprite) and cupric (CuO-tenorite) oxides, respectively. The observed features of the resonant bands of the LPFGs were found to be associated with the Cu oxide phase transitions, indicating the possibility of using LPFGs to monitor, in real time, the oxidation states of Cu thin films by following specific characteristics of the attenuation bands. In addition, LPFGs over coated with the two distinct oxidation phases of Cu were characterized for refractive index sensing in the range between 1.300 to 1.600, leading to the conclusion that the sensitivity to the refractive index of the surrounding medium of Cu coated LPFGs sensing systems can be temperature tuned.

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2017

Study of corrosion using long period fiber gratings coated with iron exposed to salty water

Authors
Coelho, L; Santos, JL; Jorge, PAS; de Almeida, JMM;

Publication
2017 25TH INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS (OFS)

Abstract
A study of long period fiber gratings (LPFG) over coated with iron (Fe) and subjected to oxidation in water with different sodium chloride (NaCl) concentrations is presented. The formation of iron oxides and hydroxides was monitored in real time by following the features of the LPFG attenuation band. Preliminary results show that Fe coated LPFGs can be used as sensors for early warning of corrosion in offshore and in coastal projects where metal structures made of iron alloys are in contact with sea or brackish water.

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