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About

About

O. Frazão, Graduated in Physics Engineering (optoelectronics and electronics) from the University of Aveiro, Portugal. He received the Ph. D. degree in Physics from the University of Porto, Portugal in 2009. Portugal. From 1997 to 1998, he was with the Institute of Telecommunications, Aveiro. Presently, he is a Researcher at Optoelectronics and Electronic Systems Unit, INESC Porto. He has published about 200 papers, mainly in international journals and conference proceedings, and his present research interests included optical fiber sensors and optical communications. He is member of the Optical Society of America (OSA) and The International Society for Optical Engineering (SPIE).

Interest
Topics
Details

Details

  • Name

    Orlando Frazão
  • Role

    Area Manager
  • Since

    01st June 1999
  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    orlando.frazao@inesctec.pt
014
Publications

2023

Measurement of Paracetamol Concentration Using an Erbium-Doped Fiber Ring Cavity

Authors
Soares, L; Perez Herrera, RA; Novais, S; Ferreira, A; Silva, S; Frazao, O;

Publication
PHOTONICS

Abstract
Process Analytical Technology (PAT) has been increasingly used in the pharmaceutical industry to monitor essential parameters in real-time during pharmaceutical processes. The concentration of Active Pharmaceutical Ingredients (APIs), such as paracetamol, is one of these parameters, and controlling its variations allows for optimization of the production process. In this study, a refractometric sensor, implemented by an interrogation system based on an Erbium-Doped Fiber Ring Cavity (EDFRC), was presented and experimentally demonstrated. The Cavity Ring proposed included a 1 x 3 coupler. One port of the coupler was used to increase the optical power of the system through a Fiber Bragg Grating (FBG), and the other two ports were used as sensing head and reference. The sensor detected variations of paracetamol concentration with a sensitivity of [(-1.00 +/- 0.05) x 10(-3)] nW/(g/kg) and a resolution of 5.53 g/kg. The results demonstrate the potential of this technology as a possible non-invasive PAT tool.

2023

Fiber Loop Mirror Based on Optical Fiber Circulator for Sensing Applications

Authors
Robalinho, P; Soares, B; Lobo, A; Silva, S; Frazao, O;

Publication
SENSORS

Abstract
In this paper, a different Fiber Loop Mirror (FLM) configuration with two circulators is presented. This configuration is demonstrated and characterized for sensing applications. This new design concept was used for strain and torsion discrimination. For strain measurement, the interference fringe displacement has a sensitivity of (0.576 +/- 0.009) pm.mu epsilon(-1). When the FFT (Fast Fourier Transformer) is calculated and the frequency shift and signal amplitude are monitored, the sensitivities are (-2.1 +/- 0.3) x 10(-4) nm(-1) mu epsilon(-1) and (4.9 +/- 0.3) x 10(-7) mu epsilon(-1), respectively. For the characterization in torsion, an FFT peaks variation of (-2.177 +/- 0.002) x 10(-12) nm(-1)/degrees and an amplitude variation of (1.02 +/- 0.06) x 10(-3)/degrees are achieved. This configuration allows the use of a wide range of fiber lengths and with different refractive indices for controlling the free spectral range (FSR) and achieving refractive index differences, i.e., birefringence, higher than 10(-2), which is essential for the development of high sensitivity physical parameter sensors, such as operating on the Vernier effect. Furthermore, this FLM configuration allows the system to be balanced, which is not possible with traditional FLMs.

2023

Measurement of paracetamol concentration using a fiber laser system

Authors
Soares, L; Perez-Herrera, RA; Novais, S; Ferreira, A; Frazao, O; Silva, S;

Publication
2023 IEEE 7TH PORTUGUESE MEETING ON BIOENGINEERING, ENBENG

Abstract
A linear fiber laser system for measurements of paracetamol concentration is experimentally demonstrated. The cavity is based on a fiber loop mirror and an FBG centered at 1567.8 nm. The sensing head corresponds to a refractometric sensor, whose which principle of operation is based on Fresnel reflection in the fiber tip (FBG side). The system works at detected variations of paracetamol concentrations with a sensitivity of [(8.74 +/- 0.34) x10(-5)] mu W/(g/kg) and a resolution of 2.77 g/kg. The results prove that the fiber laser system could be an asset for processing industries, specifically for non-invasive and real-time measurements of concentration.

2023

Transmissive glucose concentration plasmonic Au sensor based on unclad optical fiber

Authors
Cunha, C; Assuncao, AS; Monteiro, CS; Leitao, C; Mendes, JP; Silva, S; Frazao, O; Novais, S;

Publication
2023 IEEE 7TH PORTUGUESE MEETING ON BIOENGINEERING, ENBENG

Abstract
Using surface resonance (SPR) as a sensitivity enhancer, this work describes the development of a transmissive multimode optical fiber sensor with a gold (Au) thin film that measures glucose concentration. The fiber's cladding was initially removed, and an Au layer was then sputtered onto its surface to simultaneously excite SPR and reflect light, making the SPR sensor extremely sensitive to changes in the environment's refractive index. A range of glucose concentrations, from 0.0001 to 0.5000 g/ml, were tested on the sensor. A maximum sensitivity of 161.302 nm/(g/mL) was attained for the lowest glucose concentration, while the highest concentration yielded a sensitivity of 312.000 nm/(g/mL). The proposed sensor's compact size, high sensitivity, good stability and practicality make it a promising candidate for a range of applications, including detecting diabetes.

2023

Paracetamol concentration-sensing scheme based on a linear cavity fiber laser configuration

Authors
Soares, L; Perez Herrera, RA; Novais, S; Ferreira, A; Fraza, O; Silva, S;

Publication
OPTICAL FIBER TECHNOLOGY

Abstract
A paracetamol concentration-sensing scheme based on a linear cavity fiber laser configuration is demonstrated experimentally. The laser cavity has a fiber sensor at one end, that allows refractive index measurements. The refractometer consists of a cleaved fiber tip combined with an FBG functioning as a reflecting mirror. The combination of a fiber loop mirror at the other end allows to reflect all the light from the FBG and refractometer, forming a linear cavity. By measuring the intensity variation of the Fresnel reflection at the fiber-to-liquid interface, the measured concentration is linear and have a concentration sensitivity of [( - 8.74 & PLUSMN; 0.34) x 10-5 ] & mu;W/(g/kg), over a range of 52.61 to 219.25 g/kg, and with a resolution of 2.77 g/kg. The results obtained present high stability and prove the potential of the fiber laser system to performed realtime measurements of concentration, in a non-invasive way.

Supervised
thesis

2022

Model-Driven Engineering for DevOps

Author
Hugo Afonso da Gião

Institution
UM

2022

Automatic C/C++ Source-Code Analysis and Normalization

Author
João Nuno Carvalho de Matos

Institution
UP-FEUP

2022

GesSAD - Gestão de serviços de apoio domiciliário

Author
JOSÉ MIGUEL RIBEIRO FERREIRA

Institution
IPP-ISEP

2022

Mapas Topológicos para Exploração Robótica de Minas Subterrâneas Submersas

Author
PEDRO MIGUEL SERRÃO DA VEIGA MARTINS

Institution
IPP-ISEP

2022

Augmented Reality in Industrial Equipment

Author
João Pedro Pinheiro de Lacerda Campos

Institution
UP-FEUP