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Sobre

José Manuel Marques Martins de Almeida é licenciado em Física Aplicada  pela Universidade do Porto, Porto, Portugal. Doutorou-se em Física em 1998 na mesma universidade. Desde 2000 é Professor Associado do Departamento de Física, Universidade de Trás os Montes e Alto Douro, Vila Real, Portugal. Obteve o título de agregado em 2006. Atualmente é investigador do Centro de Fotónica Aplicada do INESC TEC, Porto. Os seus atuais interesses de investigação incluem sensores ópticos, espectroscopia e biofísica.

Tópicos
de interesse
Detalhes

Detalhes

002
Publicações

2019

Evaluation of food labelling usefulness for consumers

Autores
Moreira, MJ; Garcia Diez, J; de Almeida, JMMM; Saraiva, C;

Publicação
International Journal of Consumer Studies

Abstract

2019

Low-cost interrogation system for long-period fiber gratings applied to remote sensing

Autores
dos Santos, PSS; Jorge, PAS; de Almeida, JMMM; Coelho, L;

Publicação
Sensors (Switzerland)

Abstract
We present a portable and low-cost system for interrogation of long-period fiber gratings (LPFGs) costing around a 30th of the price of a typical setup using an optical spectrum analyzer and a broadband light source. The unit is capable of performing real-time monitoring or as a stand-alone data-logger. The proposed technique uses three thermally modulated fiber-coupled laser diodes, sweeping a few nanometers around their central wavelength. The light signal is then modulated by the LPFG and its intensity is acquired by a single photo-detector. Through curve-fitting algorithms the sensor transmission spectrum is reconstructed. Testing and validation were accomplished by inducing variations in the spectral features of an LPFG through changes either in external air temperature from 22 to 425 °C or in refractive index (RI) of the surrounding medium from 1.3000 to 1.4240. A dynamic resolution between 3.5 and 1.9 °C was achieved, in temperatures from 125 to 325 °C. In RI measurements, maximum wavelength and optical power deviations of 2.75 nm and 2.86 dB, respectively, were obtained in the range from 1530 to 1570 nm. The worse RI resolution obtained was 3.47 × 10 -3 . The interrogation platform was then applied in the detection of iron corrosion, expressing wavelength peak values within 1.12 nm from the real value in the region between 1530 and 1570 nm. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

2019

Mach-Zehnder Interferometers Based on Long Period Fiber Grating Coated with Titanium Dioxide for Refractive Index Sensing

Autores
Soares Guedes Vasconcelos, HCASG; Marques Martins de Almeida, JMMM; Teixeira Saraiva, CMT; da Silva Jorge, PAD; Costa Coelho, LCC;

Publicação
Journal of Lightwave Technology

Abstract

2018

Quantification of Ethanol Concentration in Gasoline Using Cuprous Oxide Coated Long Period Fiber Gratings

Autores
Monteiro Silva, F; Santos, JL; Marques Martins de Almeida, JMMM; Coelho, L;

Publicação
IEEE Sensors Journal

Abstract

2018

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

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

Publicação
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

Teses
supervisionadas

2019

Development cost-effective solutions for multispectral interrogation of optical fibre sensors for bio-chemical applications

Autor
Paulo Sérgio Soares dos Santos

Instituição
UP-FEUP

2019

Development of optical biosensors for monitoring the deterioration of fresh meat and fish

Autor
Helena Catarina Araújo Soares Guedes Vasconcelos

Instituição
UTAD

2019

Estudo de adulteração de carne e peixe fresco

Autor
Maria João Pinho Moreira

Instituição
UTAD

2018

Study of Adulteration of Salmo salar with Oncorhynchus mykiss by Spectroscopies Methods

Autor
Nuno Filipe Campos Sousa

Instituição
UTAD

2018

Estudo de adulteração de carne e peixe fresco

Autor
Maria João Moreira

Instituição
UTAD