Carlos Marques

University of Aveiro

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Co-Authors

Arnaldo Leal‐Junior

Universidade Federal do Espírito Santo

142

Anselmo Frizera

Universidade Federal do Espírito Santo

123

Paulo Antunes

Instituto de Telecomunicações

Paulo André

Instituto de Telecomunicações

María José Pontes

Universidade Federal do Espírito Santo

Rui Min

Beijing Normal University

Rogério N. Nogueira

Instituto de Telecomunicações

Santosh Kumar

Liaocheng University

Ole Bang

Technical University of Denmark

D. J. Webb

Aston University

Cooperative Institutions

University of Aveiro

148

Instituto de Telecomunicações

104

Institute of Electrical and Electronics Engineers

University of Catania

Universidade do Porto

University of Lisbon

Universidade Federal do Espírito Santo

Universidade de São Paulo

Universidade Tecnológica Federal do Paraná

Instituto Superior Técnico

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Portable Multihole Plastic Optical Fiber Sensor for Liquid-Level and Refractive Index Monitoring

IEEE Sensors Journal (2022)

Yifan Ye Changjian Zhao Zhuo Wang Chuanxin Teng Carlos Marques

In this article, we report a low-cost method to fabricate plastic optical fiber (POF) liquid-level and refractive index (RI) sensors integrated with smartphones by molds and drilling microholes in side-growing POFs (SGPOFs) with high-temperature metal wire. These sensors can be used for real-time liquid-level and RI monitoring, especially under situations requiring portability and illumination. When the liquid level changes, the change of the RI around the microholes leads to a change in the light intensity transmitted in the fiber, enabling us to measure the liquid level and RI. Utilizing one sensor with six holes (0.45 mm radius and 15 mm spacing) in 2.0-mm SGPOF, the results of level and RI measuring are in good agreement with the theory. The liquid-level measurement of the sensor is carried out for water with an RI of 1.333, the level sensitivity is 0.29%/cm ± 0.02%/cm. In the RI measurement, the RI sensitivity of the sensor is −22.8%/RIU ± 0.6%/RIU in the measurement range from 1.333 to 1.475.

Level sensor

Level measurement

10.1109/jsen.2022.3228224

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Citations (18)

Optical fiber sensing for marine environment and marine structural health monitoring: A review

Optics & Laser Technology (2021)

Rui Min Zhengyong Liu Luís Pereira Chenkun Yang Qi Sui

Structural Health Monitoring

10.1016/j.optlastec.2021.107082

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Citations (348)

Shifting the paradigm from illness to wellbeing: development of a Municipal Health Strategy

European Journal of Public Health (2023)

I. Vieira de Sousa Raquel Martins Roberta Lima Caldeira C Ligeiro Carlos Marques

Abstract Issue Portugal is undergoing a health promotion and healthcare competency transferring process to local governments, requiring the development and implementation of Municipal (local) Health Strategies (MHS). Planning an MHS remains a challenge as no guidelines have been established, being imperative to involve citizens and local stakeholders. Description of the problem The MHS contemplates, at the municipal level and in the field of health, the priority lines of intervention and respective targets, indicators, activities, resources, and timeframes. This communication will describe the participatory mixed-methods design created for the development of one of the largest municipalities of Portugal: Almada. A technical panel was formed to act as a think tank throughout the development of the MHS, involving different public and private local social actors (Almada city hall, parishes councils, schools, faculties, sports clubs, healthcare units, social service organizations, etc.). The world café method was selected for collaborative thinking, involving also public health and health promotions experts and Almada citizens. A population-based survey complemented public registries as a data source for building up a municipal health profile (a diagnostic tool for supporting the MHS definition). What are the vision and values of Almada's MHS, how to involve the community, and what are Almada's MHS strategic axes, these are some of the questions discussed in the world cafés. Results From March to May 2023, six world cafés were conducted, plus one population-based survey focused on municipalities’ health and well-being indicators. The preliminary data point to an MHS “shifting the paradigm from illness prevention to wellbeing promotion”. Lessons Collaborative models are pivotal to building up effective intersectoral municipal policies, reflecting real-world health problems, and tackling real-world solutions. Key messages • The definition of local health strategies require collaborative, co-construction oriented models, with challenging methodological processes. • A multi-sectorial stakeholder panel set out positive health and wellbeing indicators and goals (instead of disease prevention goals) as priority for a Municipality Health Strategy.

Promotion (chess)

Participatory planning

10.1093/eurpub/ckad160.1673

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Citations (0)

Inscription of narrow bandwidth Bragg gratings in polymer optical fibers

Journal of Optics (2013)

Carlos Marques Lúcia Bilro Nélia Alberto D. J. Webb Rogério N. Nogueira

We report on the inscription and characterization of narrow bandwidth fiber Bragg gratings (FBGs) in different spectral regions using polymer optical fibers (POFs). Narrow bandwidth FBGs are increasingly essential for optical filtering in POF transmission systems and photonic applications. Long FBGs with resonance wavelengths of around 600, 850 and 1550 nm were inscribed in several types of polymer optical fibers using a scanning technique with a short optical path. The technique allowed the inscription in relatively short periods of time. The achieved 3 dB bandwidth varied from 0.22 down to 0.045 nm considering FBG lengths of 10 and 25 mm, respectively.

Fiber Bragg Grating

PHOSFOS

Inscribed figure

Optical path length

10.1088/2040-8978/15/7/075404

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Citations (6)

Performance Analysis of a Lower Limb Multi Joint Angle Sensor Using CYTOP Fiber: Influence of Light Source Wavelength and Angular Velocity Compensation

Sensors (2020)

Letícia Avellar Arnaldo Leal‐Junior Carlos Marques Anselmo Frizera

This paper presents the analysis of an intensity variation polymer optical fiber (POF)-based angle sensor performance, i.e., sensitivity, hysteresis and determination coefficient ( R 2 ), using cyclic transparent optical polymer (CYTOP) fiber. The analysis consisted of two approaches: influence of different light source central wavelengths (430 nm, 530 nm, 660 nm, 870 nm and 950 nm) and influence of different angular velocities ( 0.70 rad/s, 0.87 rad/s, 1.16 rad/s, 1.75 rad/s and 3.49 rad/s). The first approach aimed to select the source which resulted in the most suitable performance regarding highest sensitivity and linearity while maintaining lowest hysteresis, through the figure of merit. Thereafter, the analysis of different angular velocities was performed to evaluate the influence of velocity in the curvature sensor performance. Then, a discrete angular velocity compensation was proposed in order to reduce the root-mean-square error (RMSE) of responses for different angular velocities. Ten tests for each analysis were performed with angular range of 0 ∘ to 50 ∘ , based on knee and ankle angle range during the gait. The curvature sensor was applied in patterns simulating the knee and ankle during the gait. Results show repeatability and the best sensor performance for λ = 950 nm in the first analysis and show high errors for high angular velocities ( w = 3.49 rad/s) in the second analysis, which presented up to 50 % angular error. The uncompensated RMSE was high for all velocities ( 6.45 ∘ to 12.41 ∘ ), whereas the compensated RMSE decreased up to 74 % ( 1.67 ∘ to 3.62 ∘ ). The compensated responses of application tests showed maximum error of 5.52 ∘ and minimum of 1.06 ∘ , presenting a decrease of mean angular error up to 30 ∘ when compared with uncompensated responses.

Repeatability

10.3390/s20020326

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Citations (8)

An Optical Fiber-Integrated Smart Structure for Flow Rate and Environmental Monitoring in Liquids

IEEE Sensors Journal (2024)

Gabriel Z. A. de Assis Pedro H. F. Rocha Carlos Marques Rogério Ramos Arnaldo Leal‐Junior

This paper presents the development of a smart structure comprised of a hydraulic metering arrangement for simultaneous data readings of temperature, flow rate, salinity, pH and turbidity in liquids. The sensors are based on optical fiber sensing technologies following two major principles: Fiber Bragg Gratings (FBGs) and intensity variation-based sensors. The turbidity sensor is based on the light transmission between two distinct optic fiber cables, where the transmitted optical power is directly related to the turbidity of the medium. In addition, the FBG sensors are coated with different materials and placed at different positions to obtain the sensitivity of the desired parameters. Specifically, the salinity sensor is based on a polyimide-coated FBG, whereas the pH sensor uses a hydrogel-coated FBG. It is also worth noting that the FBGs are intrinsically sensitive to temperature and the FBG temperature sensor is based only on an uncoated FBG. Finally, the flow rate sensor is based on a FBG-embedded cantilever transversely positioned on the hydraulic section. All discussed sensors are embedded in a flanged hydraulic tube spool made by 3D-printing technology and the data analysis and multiple output regression is based on the k-Nearest Neighbours (kNN) algorithm. The results show the feasibility of the proposed solution, where all developed sensors are able of detecting the aforementioned parameters at different samples and different flow conditions. The relative errors of the sensors are below 3% considering the reference sensors used on the samples preparation.

10.1109/jsen.2024.3401453

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Embedding FBG sensors for monitoring vital signs of the human body: Recent progress over the past decade

APL Photonics (2024)

Daniel Krizan Jiri Stipal Jan Nedoma Sandro Oliveira Marcel Fajkus

Fiber optic sensors based on fiber Bragg grating (FBG) technology have the potential to revolutionize the way vital signs of the human body are measured and monitored. By leveraging their unique properties, these sensors can provide accurate and reliable data, thus enhancing the effectiveness of wearable devices. The integration of FBG sensors into different materials not only broadens their application scope but also improves user comfort and device practicality. However, some challenges remain in optimizing the embedding process to ensure sensor performance and durability. This review provides an overview of FBG technology employed for measuring vital signs of the human body reported in the past decade. The focus of the review is on the FBG embedding strategies into different materials, categorized into these three main groups (i.e., 3D printed, textiles, and polymers) and explores the implications of embedding fiber optic sensors in each category. Furthermore, it discusses the potential impact of these embedded sensors on the accuracy, comfort, and practicality of wearable devices designed for monitoring vital signs, highlighting the potential of these sensors to transform the field of health monitoring. Future research directions may include exploring new materials for embedding and refining sensor design further to improve the accuracy and comfort of these wearable devices. Ultimately, the evolution of fiber optic sensors could significantly advance the field of human vital sign monitoring, paving the way for more sophisticated and user-friendly health monitoring systems.

Vital signs

10.1063/5.0226556

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Prediction of fish mortality based on a probabilistic anomaly detection approach for recirculating aquaculture system facilities

Review of Scientific Instruments (2021)

Bruna Daniela Mendes Lopes Luís C. B. Silva Isidro Blanquet Pétia Georgieva Carlos Marques

Aquaculture is a fundamental sector of the food industry nowadays. However, to become a sustainable and more profitable industry, it is necessary to monitor several associated parameters, such as temperature, salinity, ammonia, potential of hydrogen, nitrogen dioxide, bromine, among others. Their regular and simultaneous monitoring is expected to predict and avoid catastrophes, such as abnormal fish mortality rates. In this paper, we propose a novel anomaly detection approach for the early prediction of high fish mortality based on a multivariate Gaussian probability model. The goal of this approach is to determine the correlation between the number of daily registered physicochemical parameters of the fish tank water and the fish mortality. The proposed machine learning model was fitted with data from the weaning and pre-fattening phases of Senegalese sole (Solea senegalensis) collected over 2018, 2019, and 2020. This approach is suitable for real-time tracking and successful prediction of up to 80% of the high fish mortality rates. To the best of our knowledge, the proposed anomaly detection approach is the first time studied and applied in the framework of the aquaculture industry.

Anomaly (physics)

10.1063/5.0045047

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Citations (13)

Hot water-assisted fabrication of chirped polymer optical fiber Bragg gratings

Optics Express (2018)

Rui Min B. Ortega Christian Broadway Christophe Caucheteur Getinet Woyessa

We obtained chirped gratings by performing hot water gradient thermal annealing of uniform poly (methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs). The proposed method's simplicity is one of its main advantages because no special phase mask or additional etching are needed. It not only enables easy control tuning of the central wavelength and chirp characteristics, but it also leads to obtain flexible grating response, compared with tapered chirped POFBGs. Therefore, a flexible and low-cost chirped POFBG devices fabrication technique has been presented by using a single uniform phase mask.

Fiber Bragg Grating

Chirp

PHOSFOS

10.1364/oe.26.034655

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Citations (11)

Fiber Grating Sensing for Aerospace Applications

Wei Zhang Luming Zhao J. Y. Wang Jincheng Wang J. S. Ni

Fiber Bragg gratings having the advantages of lightweight, dielectric nature, immunity to electromagnetic interference, chemical passivity, and flexibility, integrated with being serially multiplexed with many sensors in a single fiber and multi-parameter sensing capability make them very competitive in aerospace applications. Research and development are carried out toward those of most interest to the industry.

Fiber Bragg Grating

PHOSFOS

10.1109/icocn59242.2023.10236347

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Citations (0)