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Sobre
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Sobre

Licenciei-me em Física Aplicada (Otíca e Lasers) pela Universidade do Minho (1996), tendo obtido o Mestrado em Lasers e Optoelectrónica no Departamento de Física da Faculdade de Ciências da Universidade do Porto (2000). Em 2006 conclui o Doutoramento em Física pela Universidade do Porto, em colaboração com o Department of Physics and Optical Sciences da University of North Carolina at Charlotte, EUA, com trabalho em sensores em fibra ótica baseados em luminescência de Quantum dots, para medição de parâmetros bioquímicos. Desde 1997 tenho estado envolvido em diversos projectos de investigação e desenvolvimento e transferência de tecnologia relacionados com tecnologia de sensores em fibra ótica, desenvolvendo novas configurações e técnicas de interrogação para sensores óticos. Presentemente e desde 2007 sou investigador Sénior do INESC TEC responsável pela equipa de sensores bioquímicos, onde exploramos o potencial das tecnologias de fibra ótica e ótica integrada em aplicações médicas e de monitorização ambiental, enquadrados em diferentes projectos de investigação e dsenvolvimento.  Sou autor de mais de 200 publicações ná àrea dos sensores, em conferências nacionais e internacionais e em jornais da especialidade, com revisão por pares. Sou autor de 3 capitulos de livro e de uma patente. Sou membro da SPIE e da SPOF.

Tópicos
de interesse
Detalhes

Detalhes

032
Publicações

2021

Femtosecond laser-written long period fibre gratings coated with titanium dioxide for improved sensitivity

Autores
Viveiros, D; de Almeida, JMMM; Coelho, L; Vasconcelos, H; Amorim, VA; Maia, JM; Jorge, PAS; Marques, PVS;

Publicação
Optical Sensing and Detection VI

Abstract

2021

Preliminary assessment on the detection of putrescine using long period fiber gratings coated with titanium dioxide and poly(ethylene-co-vinyl acetate)

Autores
Vasconcelos, H; de Almeida, JMMM; Saraiva, C; Viveiros, D; Jorge, PAS; Coelho, L;

Publicação
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
Biogenic amines, such as putrescine are potential indicators of food storage condition and deterioration. The real time measurement of their concentration in food may become an important method of food control. It was found that putrescine diffuses through a thin layer made from a solution of Poly(ethylene-co-vinyl acetate) (PEVA) and maleic anhydride. Poly(ethylene-co-vinyl acetate) is a common non-chlorinated vinyl capable to adsorb specific analytes as putrescine which upon diffusion, reversibly binds to the maleic anhydride causing the polymer swelling resulting in spectral changes from the optical point of view. Long Period Fiber Gratings coated with 30 nm titanium dioxide, a high refractive index material used to increase the intrinsic sensitivity to the external refractive index, were overcoated with a thin layer of maleic anhydride doped Poly(ethylene-co-vinyl acetate). When exposed to solutions containing small concentrations of putrescine the resonant band corresponding to the LP1,6 cladding mode was found to move to shorter wavelengths. The observed blue shift corresponds to the increasing concentration of putrescine in the fiber sensor structure. Further work is being carried out to improve the sensitivity and the limit of detection of the sensing system as well as to increase range of operation, which is presently limited to 0.3 to 0.5 M. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

2021

Biosensors for Biogenic Amines: A Review

Autores
Vasconcelos, H; Coelho, LCC; Matias, A; Saraiva, C; Jorge, PAS; de Almeida, JMMM;

Publicação
Biosensors

Abstract
Biogenic amines (BAs) are well-known biomolecules, mostly for their toxic and carcinogenic effects. Commonly, they are used as an indicator of quality preservation in food and beverages since their presence in higher concentrations is associated with poor quality. With respect to BA’s metabolic pathways, time plays a crucial factor in their formation. They are mainly formed by microbial decarboxylation of amino acids, which is closely related to food deterioration, therefore, making them unfit for human consumption. Pathogenic microorganisms grow in food without any noticeable change in odor, appearance, or taste, thus, they can reach toxic concentrations. The present review provides an overview of the most recent literature on BAs with special emphasis on food matrixes, including a description of the typical BA assay formats, along with its general structure, according to the biorecognition elements used (enzymes, nucleic acids, whole cells, and antibodies). The extensive and significant amount of research that has been done to the investigation of biorecognition elements, transducers, and their integration in biosensors, over the years has been reviewed.

2021

Development of a Long Period Fiber Grating Interrogation System Using A Multimode Laser Diode

Autores
Silva, LH; Santos, P; Coelho, LCC; Jorge, P; Baptista, JM;

Publicação
Sensors

Abstract
Optical fiber gratings have long shown their sensing capabilities. One of the main challenges, however, is the interrogation method applied, since typical systems tend to use broadband light sources with optical spectrum analyzers, laser scanning units or CCD (Charged Coupled Device) spectrometers. The following paper presents the development of an interrogation system, which explores the temperature response of a multimode laser diode, in order to interrogate long period fiber gratings. By performing a spectral sweep along one of its rejection bands, a discrete attenuation spectrum is created. Through a curve fitting technique, the original spectrum is restored. The built unit, while presenting a substantially reduced cost compared with typical interrogation systems, is capable of interrogating along a 10 nm window with measurement errors reaching minimum values as low as 0.4 nm, regarding the grating central wavelength, and 0.4 dB for its attenuation. Given its low cost and reduced dimensions, the developed system shows potential for slow-changing field applications.

2021

Effect of low-doses of gamma radiation on electric arc-induced long period fiber gratings

Autores
Mesonero Santos, P; Fernandez Medina, A; Coelho, LCC; Viveiros, D; Jorge, PA; Belenguer, T; Heredero, RL;

Publicação
Sensors

Abstract
This work presents an experimental study on the effects of gamma radiation on Long Period Fiber Gratings (LPFGs) in a low-dose test campaign to evaluate their eventual degradation. The study was carried out with standard single-mode fibers where the grating was inscribed using the Electric-Arc Discharge (EAD) technique. Before the gamma campaign, a detailed optical characterization was performed with repeatability tests to verify the accuracy of the setup and the associated error sources. The gamma-induced changes up to a dose of 200 krad and the recovery after radiation were monitored with the Dip Wavelength Shift (DWS). The results show that the gamma sensitivity for a total dose of 200 krad is 11 pm/krad and a total DWS of 2.3 nm has been observed with no linear dependence. Post-radiation study shows that recovery from radiation-induced wavelength shift is nearly complete in about 4000 h. Experimental results show that the changes suffered under gamma irradiation of these LPFGs are temporary making them a good choice as sensors in space applications. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Teses
supervisionadas

2020

Fiber Laser Plasma Spectroscopy for Real-Time

Autor
Miguel Fernandes Soares Ferreira

Instituição
UP-FCUP

2020

Laser Induced Breakdown Spectroscopy (LIBS) as an analytical tool for geological samples

Autor
Diana Faria Capela

Instituição
UP-FCUP

2020

Fast prototyping of advanced sensing devices using three-dimensional direct writing with femtosecond laser

Autor
Vítor Alexandre Oliveira Amorim

Instituição
UP-FCUP

2020

Development of differential optrodes for highly sensitive and reliable chemical sensing

Autor
João Pedro Sampaio Mendes

Instituição
UP-FCUP

2020

Optimization of LaserInduced Breakdown Spectroscopy (LIBS) for application in the cork industry

Autor
Hugo Azevedo Veloso

Instituição
UP-FCUP