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About

About

Birth year 1956.

Academic degrees
1990 – University of Porto, Engineering Faculty, Porto, Portugal – www.fe.up.pt
Completed the curricular part of the MSc degree in Telecommunications (1 year).
1986 – University of Porto, Science Faculty, Porto, Portugal – www.fc.up.pt
Graduated in Physics, branch of Applied Physics, Optics and Electronics (5 years).

Professional experience
2007 – present - INESC Porto / INESC TEC – www.inesctec.pt
Optical fiber sensors: electronic design, implementation and test; software development, system integration and data
acquisition.
2005 – 2007 - FiberSensing – Sistemas Integrados de Monitorização (Now HBM FiberSensing) – www.fibersensing.com
Design and test of front-end electronics for signal conditioning.
Software development for sub-system and equipment testing and quality control.
1986 – 2005 - INESC Porto
Optical fiber communications, design, implementation and test: Tx/Rx, clock distribution and clock recovery.
Wireless infrared communications: R&D and technology transfer activities
Organized and taught technical courses on optical communications and instrumentation electronics.
Supervised or assisted the work of graduate and post-graduate students.

Other Professional Activities
1987 – CERN, Geneva, Switzerland (Training internship)
Study of Surface Mount Technology and implementation of front-end amplifier (6 months)
2002 – Ciência Viva, Lisboa, Portugal
National fair to promote science and technology among high-school students (1 week)
2004 – Hannover Messe, Germany
Presented fiber Bragg grating measurement system prototype, developed at INESC Porto (1 week)
2005 – University of Oxford, UK (Courses attended)
High-Speed Digital Design and Advanced High-Speed Signal Propagation courses (1 week)
Teaching in Training Courses
1992 – 1993 – FUNDETEC, Técnicos Especialistas em Electrónica e Telecomunicações
1993 – 1994 – Fibras Ópticas
Development of Courses for Computer Based Training
1990 - IN#TEL#EC - Integrated Telecommunications Training for the European Community, COMETT 90/1/5390/Cc
1993 – 1994 – EAC, Formação de Técnicos Especialistas em Optoelectrónica

Main areas of interest
Optical communications, both fibre-based and wireless infrared.
Phase-locked loop circuits, namely clock recovery and frequency multiplication.
PCB interconnection technologies, for high-speed electronic circuits.
Optical fibre sensors.
Low-noise electronics.
Signal conditioning.

Software skills
LabView (National Instruments)
MatLab (Mathworks)
OptSim (Artis Software, now sold by RSoft/Synopsys)
SPICE (Berkeley University)
Eagle (CadSoft)

Interest
Topics
Details

Details

Publications

2017

ECOAL Project-Delivering Solutions for Integrated Monitoring of Coal-Related Fires Supported on Optical Fiber Sensing Technology

Authors
Ribeiro, J; Viveiros, D; Ferreira, J; Lopez Gil, A; Dominguez Lopez, A; Martins, HF; Perez Herrera, R; Lopez Aldaba, A; Duarte, L; Pinto, A; Martin Lopez, S; Baierl, H; Jamier, R; Rougier, S; Auguste, JL; Teodoro, AC; Goncalves, JA; Esteban, O; Santos, JL; Roy, P; Lopez Amo, M; Gonzalez Herraez, M; Baptista, JM; Flores, D;

Publication
APPLIED SCIENCES-BASEL

Abstract
The combustion of coal wastes resulting from mining is of particular environmental concern, and the importance of proper management involving real-time assessment of their status and identification of probable evolution scenarios is recognized. Continuous monitoring of the combustion temperature and emission levels of certain gases allows for the possibility of planning corrective actions to minimize their negative impact on the surroundings. Optical fiber technology is well suited to this purpose and here we describe the main attributes and results obtained from a fiber optic sensing system projected to gather data on distributed temperature and gas emissions in these harsh environments.

2015

Ammonia sensing system based on wavelength modulation spectroscopy

Authors
Viveiros, D; Ferreira, J; Silva, SO; Ribeiro, J; Flores, D; Santos, JL; Frazao, O; Baptista, JM;

Publication
Photonic Sensors

Abstract
A sensing system in the near infrared region has been developed for ammonia sensing based on the wavelength modulation spectroscopy (WMS) principle. The WMS is a rather sensitive technique for detecting atomic/molecular species, presenting the advantage that it can be used in the near-infrared region by using the optical telecommunications technology. In this technique, the laser wavelength and intensity were modulated by applying a sine wave signal through the injection current, which allowed the shift of the detection bandwidth to higher frequencies where laser intensity noise was typically lower. Two multi-pass cells based on free space light propagation with 160 cm and 16 cm of optical path length were used, allowing the redundancy operation and technology validation. This system used a diode laser with an emission wavelength at 1512.21 nm, where NH3 has a strong absorption line. The control of the NH3 gas sensing system, as well as acquisition, processing and data presentation was performed. © 2015, The Author(s).

2015

Fiber Optic Sensing System for Temperature and Gas Monitoring in Coal Waste Pile Combustion Environments

Authors
Viveiros, D; Ribeiro, J; Ferreira, J; Lopez Aldaba, A; Pinto, AMR; Perez Herrera, RA; Diaz, S; Lopez Gil, A; Dominguez Lopez, A; Esteban, O; Martin Lopez, S; Auguste, JL; Jamier, R; Rougier, S; Silva, SO; Frazao, O; Santos, JL; Flores, D; Roy, P; Gonzalez Herraez, M; Lopez Amo, M; Baptista, JM;

Publication
24TH INTERNATIONAL CONFERENCE ON OPTICAL FIBRE SENSORS

Abstract
It is presented an optical fiber sensing system projected to operate in the demanding conditions associated with coal waste piles in combustion. Distributed temperature measurement and spot gas sensing are requirements for such a system. A field prototype has been installed and is continuously gathering data, which will input a geological model of the coal waste piles in combustion aiming to understand their dynamics and evolution. Results are presented on distributed temperature and ammonia measurement, being noticed any significant methane emission in the short time period considered. Carbon dioxide is also a targeted gas for measurement, with validated results available soon. The assessment of this technology as an effective and reliable tool to address the problem of monitoring coal waste piles in combustion opens the possibility of its widespread application in view of the worldwide presence of coal related fires.

2014

Environmental monitoring of S. Pedro da Cova waste pile: Combustion temperature [Monitorização ambiental de escombreira de S. Pedro da Cova: Temperatura de combustão]

Authors
Ribeiro, J; Viveiros, D; Ferreira, J; Santos, JL; Baptista, JM; Flores, D;

Publication
Comunicacoes Geologicas

Abstract
Despite the socio-economic importance of mining in Douro Coalfield, the coal exploitation and utilization originated impacts on the environment. From these stands out the S. Pedro da Cova waste pile which is self-burning since 2005. The potential environmental impacts associated with this coal waste pile include: air pollution caused by the gaseous emissions and dispersion of solid particles; pollution of soils, surface and groundwater caused by mobilization of solid particles, leaching of hazardous elements, dissolution of neoformed and deposition of solid particles; landslides and mass movements also caused the weathering agents, and deterioration of vegetation that may also be due to the acid drainage. The main objective of this work is the combustion temperature monitoring in S. Pedro da Cova waste pile using the infrared thermography technique. The acquired results during the temperature monitoring campaigns allow the study of the dynamics and evolutionary scenarios of the self-burning process in the coal waste pile, contributing to a precise definition of the risks to the environment and human health. © 2014, LNEG – Laboratório Nacional de Geologia e Energia IP.

2014

Gas sensing using wavelength modulation spectroscopy

Authors
Viveiros, D; Ribeiro, J; Flores, D; Ferreira, J; Frazao, O; Santos, JL; Baptista, JM;

Publication
SECOND INTERNATIONAL CONFERENCE ON APPLICATIONS OF OPTICS AND PHOTONICS

Abstract
An experimental setup has been developed for different gas species sensing based on the Wavelength Modulation Spectroscopy (WMS) principle. The target is the measurement of ammonia, carbon dioxide and methane concentrations. The WMS is a rather sensitive technique for detecting atomic/molecular species presenting the advantage that it can be used in the near-infrared region using optical telecommunications technology. In this technique, the laser wavelength and intensity are modulated applying a sine wave signal through the injection current, which allows the shift of the detection bandwidth to higher frequencies where laser intensity noise is reduced. The wavelength modulated laser light is tuned to the absorption line of the target gas and the absorption information can be retrieved by means of synchronous detection using a lock-in amplifier, where the amplitude of the second harmonic of the laser modulation frequency is proportional to the gas concentration. The amplitude of the second harmonic is normalised by the average laser intensity and detector gain through a LabVIEW (R) application, where the main advantage of normalising is that the effects of laser output power fluctuations and any variations in laser transmission, or optical-electrical detector gain are eliminated. Two types of sensing heads based on free space light propagation with different optical path length were used, permitting redundancy operation and technology validation.

2014

In vivo measurement of the pressure signal in the intervertebral disc of an anesthetized sheep

Authors
Roriz, P; Ferreira, JMC; Potes, JC; Oliveira, MT; Frazao, O; Santos, JL; de Oliveira Simoes, JAD;

Publication
JOURNAL OF BIOMEDICAL OPTICS

Abstract
The purpose of the present study was to measure the intradiscal pressure signal of an anesthetized sheep under spontaneous breathing. An ultra-miniature fiber optic high-pressure sensor was implanted into the nucleus pulposus of the fifth lumbar intervertebral using a dorsolateral transforaminal approach. Results suggested the periodicity of the intradiscal pressure signal was similar to the mean respiratory rate of the animal. The average resting intradiscal pressure was also calculated and compared to available data. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)

2014

Intradiscal pressure variation under spontaneous ventilation

Authors
Roriz, P; Ferreira, J; Potes, JC; Oliveira, MT; Santos, JL; Simoes, JA; Frazao, O;

Publication
23RD INTERNATIONAL CONFERENCE ON OPTICAL FIBRE SENSORS

Abstract
The pressure measured in the intervertebral discs is a response to the loads acting on the spine. External loads, such as the reaction forces resulting from locomotion, manual handling and collisions are probably the most relevant in studying spine trauma. However, the physiological functions such as breathing and hearth rate also participate in subtle variations of intradiscal pressure that can be observed only in vivo at resting. Present work is an effort to measure the effect of breathing on intradiscal pressure of an anesthetized sheep.

2014

An adjustable sensor platform using dual wavelength measurements for optical colorimetric sensitive films

Authors
Machado, C; Gouveia, C; Ferreira, J; Kovacs, B; Jorge, P; Lopes, L;

Publication
Proceedings of IEEE Sensors

Abstract
We present a new and versatile sensor platform to readout the response of sensitive colorimetric films. The platform is fully self-contained and based on a switched dual-wavelength scheme. After filtering and signal processing, the system is able to provide self-referenced measures of color intensity changes in the film, while being immune to noise sources such as ambient light and fluctuations in the power source and in the optical path. By controlling the power and the switching frequency between the two wavelengths it is possible to fine tune the output gain as well as the operational range of the sensor for a particular application, thus improving the signal conditioning. The platform uses a micro-controller that complements the analog circuit used to acquire the signal. The latter pre-amplifies, filters and conditions the signal, leaving the micro-controller free to perform sensor linearization and unit conversion. By changing the sensitive film and the wavelength of the light source it is possible to use this platform for a wide range of sensing applications. © 2014 IEEE.

2011

Optimization of the Frequency-Modulated Continuous Wave Technique for Referencing and Multiplexing Intensity-Based Fiber Optic Sensors

Authors
Rosa Ana R. Perez-Herrera; Dionisio Pereira; Orlando Frazão; João Ferreira; José Luís Santos; Francisco Araújo; Luís Alberto Ferreira; José Manuel Baptista; M. Lopez-Amo

Publication
Measurement - Measurement, vol.44, no.1, pp.230-237

Abstract

2010

Industrialization of advanced optical technologies for environmental monitoring

Authors
Orlando Frazão; D. A. Pereira; José Luís Santos; Ireneu Dias; João M. Dias; N. Vaz; M. Teixeira; A. Quintela; João Ferreira; Luís Alberto Ferreira; Francisco Araújo

Publication
CTEP - Clean Technologies and Environmental Policy, vol.12, no.1, pp.65-73

Abstract

2010

Instrumentação Virtual para Aplicações de Espectroscopia no Domínio das Frequências

Authors
V. Rodrigues; Pedro Jorge; João Ferreira; Manuel Joaquim Marques; L.A. Gomes

Publication
Física 2010 - Física 2010, Vila Real, Portugal

Abstract

2009

Virtual instrumentation for frequency domain spectroscopy applications

Authors
Vítor Manuel Rodrigues; Luís Gomes; Pedro Jorge; João Ferreira; José Luís Santos

Publication
SEON 2009 - VII Symposium on Enabling Optical Networks, Lisboa, Portugal

Abstract

2008

Frequency modulated continuous wave technique for referencing and multiplexing intensity based fiber optic sensors

Authors
R. A. Perez-Herrera; Dionísio Pereira; Orlando Frazão; João Ferreira; José Luís Santos; Francisco Araújo; Luís Alberto Ferreira; José Manuel Baptista; M. Lopez-Amo

Publication
OFS-19 - Optical Fiber Sensors 2008, Perth, Austrália

Abstract

2002

Tecnologia Óptica para Monitorização de Sistemas Estuarinos e Costeiros

Authors
Dionísio Cerqueira Alves Pereira; Orlando José dos Reis Frazão; João Manuel Castro Ferreira; José Luís Campos de Oliveira Santos

Publication
XI SIQM - XI Seminário Ibérico de Química Marítima, Faro, Portugal

Abstract

1997

Extraction of Semiconductor Intrinsic Laser Parameters by Intermodulation Distortion Analysis

Authors
Henrique Manuel de Castro Faria Salgado; João Manuel Castro Ferreira;

Publication
PTL - Photonics Technology Letters, vol.9, pp.1331

Abstract