Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
About
Download Photo HD

About

Jose Manuel Marques Martins de Almeida received the
Graduate degree in applied physics (optics and electronics)
in 1987 and the Ph.D. degree in 1998 from the
University of Porto, Porto, Portugal. Since 2000, he has the
position of an Associate Professor at the Department of
Physics, Universidade de Trás os Montes e Alto Douro, Vila
Real, Portugal, and received Habilitation in 2006 from the
same University. He is currently a Senior Researcher in the
Centre for Applied Photonics of INESC TEC, Porto. His current
research interests include optical sensors, integrated
optics, spectroscopy, and biophysics.

Interest
Topics
Details

Details

  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    jose.almeida@inesctec.pt
002
Publications

2022

Analysis of the Relative Humidity Response of Hydrophilic Polymers for Optical Fiber Sensing

Authors
Dias, B; Carvalho, J; Mendes, JP; Almeida, JMMM; Coelho, LCC;

Publication
POLYMERS

Abstract
Relative humidity (RH) monitorization is of extreme importance on scientific and industrial applications, and optical fiber sensors (OFS) may provide adequate solutions. Typically, these kinds of sensors depend on the usage of humidity responsive polymers, thus creating the need for the characterization of the optical and expansion properties of these materials. Four different polymers, namely poly(vinyl alcohol), poly(ethylene glycol), Hydromed™ D4 and microbiology agar were characterized and tested using two types of optical sensors. First, optical fiber Fabry–Perot (FP) tips were made, which allow the dynamical measurement of the polymers’ response to RH variations, in particular of refractive index, film thickness, and critical deliquescence RH. Using both FP tips and Long-Period fiber gratings, the polymers were then tested as RH sensors, allowing a comparison between the different polymers and the different OFS. For the case of the FP sensors, the PEG tips displayed excellent sensitivity above 80%RH, outperforming the other polymers. In the case of LPFGs, the 10% (wt/wt) PVA one displayed excellent sensitivity in a larger working range (60 to 100%RH), showing a valid alternative to lower RH environment sensing.

2022

Study of LSPR Spectral Analysis Techniques on SPR Optical Fiber Sensors

Authors
Dos Santos, PSS; de Almeida, JMMM; Coelho, LCC;

Publication
U.Porto Journal of Engineering

Abstract
Nanoparticles create localized surface plasmonic resonances (LSPR) with lower surrounding refractive index (SRI) sensitivities than their propagating SPR counterpart, originated in thin films. Historically, LSPR SRI sensitivities enhancements were achieved through spectral analysis methods that focus on unique spectral features. Herein, a study using that methodology was applied on SPR devices resulting in an increased sensitivity to SRI. It was found that by applying the inflection point method on optical fiber SPR sensors resulted in both sensitivity and resolution increments up to 44 and 35 %, respectively, in the SRI range from 1.3333 to 1.4150. Thus, successfully improving sensing capabilities of SPR based optical fiber sensors.

2022

Long-Period Fiber Gratings Coated with Poly(ethylene glycol) as Relative Humidity Sensors

Authors
Dias, B; de Almeida, JMMM; Coelho, LCC;

Publication
U.Porto Journal of Engineering

Abstract
Relative humidity is an important parameter in controlled environments and is typically monitored using low-cost electrochemical sensors with low resolution and accuracy. This kind of sensors cannot not be implemented in harsh or explosive environments (as in pyrotechnic facilities) due to electrical discharges, or in marine structures where the oxidation of the sensing probe materials changes the sensing response). In these cases, fiber optic sensors can provide solutions due to their intrinsic properties, such as immunity to electromagnetic interference and resistance in harsh environments. This work presents preliminary results regarding the steps of the fabrication of Long-Period Fiber Gratings, the coating processes with a thin layer of poly(ethylene glycol) (PEG) and its sensing performance to relative humidity, displaying a from 60 to 100%sensitivity of 0.6 nm/%RH in the range of 80 to 100%RH.

2022

Simple Optical Fiber Interferometer for Dynamic Measurement of Refractive Index and Thickness of Polymer Films

Authors
Dias, B; Mendes, JPS; de Almeida, JMMM; Coelho, LCC;

Publication
IEEE SENSORS JOURNAL

Abstract

2022

Optical Biosensor for the Detection of Biogenic Amines

Authors
Vasconcelos, H; De Almeida, JMMM; Mendes, J; Dias, B; Jorge, PAS; Saraiva, C; Coelho, LCC;

Publication
IEEE Sensors Journal

Abstract

Supervised
thesis

2021

Estudo de soluções de sensoriamento da humectação de folhas

Author
Davide Miguel Costa Machado

Institution

2021

Self-adaptive electromagnetic energy harvesting system

Author
Pedro Miguel Rocha Carneiro

Institution
IES_Outra

2020

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

Author
Helena Catarina Araújo Soares Guedes Vasconcelos

Institution
UTAD

2020

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

Author
Paulo Sérgio Soares dos Santos

Institution
UP-FEUP

2019

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

Author
Helena Catarina Araújo Soares Guedes Vasconcelos

Institution
UTAD