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About

About

Manuel J.B. Marques received a degree in physics from Porto University in 1983,and a PhD degree in physics from the same university in 1991. His thesis work was on nonlinear coupling to optical waveguides.

He started his colaboration with INESC in 1982 working in a project for the characterization of optical fibers. He staied at INESC until 1993. From 1993 to 2001 he was a member of Centro de Física do Porto, where he worked on fiber lasers and integrated optics. He rejoined INESC Porto in 2002, where he has worked on fiberlasers and sensors.

He has been an assistant professor in the Physics an Astronomy Department of Porto University since 1991.

Interest
Topics
Details

Details

001
Publications

2018

Center of gravity estimation using a reaction board instrumented with fiber Bragg gratings

Authors
Oliveira, R; Roriz, P; Marques, MB; Frazao, O;

Publication
PHOTONIC SENSORS

Abstract
The purpose of the present work is to construct a reaction board based on fiber Bragg gratings (FBGs) that could be used for estimation of the 2D coordinates of the projection of center of gravity (CG) of an object. The apparatus is consisted of a rigid equilateral triangular board mounted on three supports at the vertices, two of which have cantilevers instrumented with FBGs. When an object of known weight is placed on the board, the bending strain of the cantilevers is measured by a proportional wavelength shift of the FBGs. Applying the equilibrium conditions of a rigid body and proper calibration procedures, the wavelength shift is used to estimate the vertical reaction forces and moments of force at the supports and the coordinates of the object's CG projection on the board. This method can be used on a regular basis to estimate the CG of the human body or objects with complex geometry and density distribution. An example is provided for the estimation of the CG projection coordinates of two orthopaedic femur bone models, one intact, and the other with a hip stem implant encased. The clinical implications of changing the normal CG location by means of a prosthesis have been discussed.

2016

[INVITED] New advances in fiber cavity ring-down technology

Authors
Silva, SO; Magalhaes, R; Marques, MB; Frazao, O;

Publication
OPTICS AND LASER TECHNOLOGY

Abstract
A brief review in the cavity ring-down technique (CRD) is presented. In this review, there will only be considered the conventional fiber CRD configuration, i.e., there will only be presented researches involving cavities with two couplers with 99:1 ratios, due to the large amount of publications involving this spectroscopy method. The presented survey is divided in different topics related to the measurement of physical parameters, such as strain and temperature, curvature, pressure, refractive index, gas and biochemical sensing.

2016

Cavity ring-down technique for remote sensing A proof-of-concept for displacement measurement

Authors
Silva, S; Marques, MB; Frazao, O;

Publication
SIXTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Abstract
This work demonstrates the viability of using a cavity ring-down technique (CRD) for remote sensing. A conventional CRD configuration is used where and optical circulator is added inside the fibre loop to couple 20 km of optical fibre with a gold mirror at its end with the purpose of remote sensing. As a proof-of-concept, an intensity sensor based on an eight-figure configuration is used at the end of the 20 km of fibre for displacement sensing. In this case, a commercial OTDR is used as modulated light source to send impulses down to the fibre ring.

2016

Fiber probe microcavities for refractive index and temperature discrimination

Authors
Andre, RM; Warren Smith, SC; Becker, M; Dellith, J; Rothhardt, M; Zibaii, MI; Latifi, H; Marques, MB; Bartelt, H; Frazao, O;

Publication
SIXTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Abstract
Fiber probe structures composed of two physical microcavities were created using focused ion beam technology. These structures have a tip-like shape as they were milled in preciously etched tapered fiber tips. The microprobes are then characterized for temperature and refractive index sensing using a signal filtering technique to discriminate signals from distinct microcavities. Using fast Fourier transforms combined with band-pass filters, it is possible to reconstruct the spectra of each cavity independently and thus measure their individual spectral shifts.

2016

CAVITY RING-DOWN TECHNIQUE FOR REMOTE SENSING

Authors
Silva, S; Marques, MB; Frazao, O;

Publication
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
This work demonstrates the viability of using a cavity ring-down (CRD) technique for remote sensing. A conventional CRD configuration is used where an optical circulator is added inside the fiber loop to couple 19 km of optical fiber with a gold mirror at its end with the purpose of remote sensing. As a proof-of-concept, an intensity sensor based on an eight-figure configuration is used at the end of the 19 km of fiber for displacement sensing. (C) 2016 Wiley Periodicals, Inc.

Supervised
thesis

2017

Surface plasmon resonance excitations and nonlinear phenomena in light-guiding structures based on tapered optical fibers

Author
Tiago Jorge Mendes Martins

Institution
UP-FCUP

2016

Focused ion beam milling of optical fiber microstructures for sensing applications

Author
Ricardo Melo André

Institution
UP-FCUP

2016

Polymer Fiber based Sensors

Author
Miguel Fernandes Soares Ferreira

Institution
UP-FCUP

2015

Optical fiber sensor fabrication using a CO2 laser

Author
Tiago Jorge Mendes Martins

Institution
UP-FCUP

2015

Optical Fiber Post-Procesing for the Fabrication of Micro and Nanosensors

Author
Ricardo Melo André

Institution
UP-FCUP