A5086587915- Advanced Fiber Optic Sensors
- Non-Invasive Vital Sign Monitoring
- Cardiovascular Health and Disease Prevention
- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Blood Pressure and Hypertension Studies
- Plasmonic and Surface Plasmon Research
- Diabetic Foot Ulcer Assessment and Management
- Heart Rate Variability and Autonomic Control
- Optical Imaging and Spectroscopy Techniques
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Cardiovascular and exercise physiology
- Nutritional Studies and Diet
- Advanced Photonic Communication Systems
- Photonic Crystal and Fiber Optics
- Context-Aware Activity Recognition Systems
- ECG Monitoring and Analysis
- Advanced Biosensing Techniques and Applications
- Intimate Partner and Family Violence
- Adhesion, Friction, and Surface Interactions
- Electrochemical sensors and biosensors
- Biosensors and Analytical Detection
- Advanced biosensing and bioanalysis techniques
University of Aveiro
2016-2025
Instituto de Telecomunicações
2013-2022
ORCID
2020
Centro Hospitalar do Baixo Vouga
2016
Abstract Laser‐induced graphene (LIG) can be obtained by irradiation of a polymer laser source. The present work demonstrates that it is possible to obtain this kind material using an ultraviolet instead the typical infrared Using approach, fourfold decrease in penetration depth (5 µm) achieved, while spatial resolution doubled. Electromechanical strain LIG sensors are patterned polyimide substrates with different thicknesses and their performance strain, bending, force inputs measured. A...
This paper presents the development and feasibility tests of a cortisol immunosensor. The sensor is based on surface plasmon resonance (SPR) using an unclad plastic optical fiber (POF) in which SPR used as sensitivity enhancer, promoted by gold/palladium (AuPd) alloy coating. AuPd coated fibers were functionalized with anti-cortisol antibody passivated bovine serum albumin (BSA) to be tested presence target analyte. antibody-antigen binding reaction caused variation refractive index coating,...
Measuring cortisol levels as a stress biomarker is essential in many medical conditions associated with high risk of metabolic syndromes such anxiety and cardiovascular diseases, among others. One technology that has growing interest recent years fiber optic biosensors enable ultrasensitive detection. Such allied progress being achieved basic interrogation, accuracy improvements, novel applications. The development improved monitoring, simplified manufacturing process, reproducibility, low...
The integration of fiber Bragg grating (FBG) sensors in lithium-ion cells for in-situ and in-operando temperature monitoring is presented herein. measuring internal external variations was performed through four FBG during galvanostatic cycling at C-rates ranging from 1C to 8C. were placed both outside inside the cell, located center electrochemically active area tab-electrode connection. recorded 4.0 ± 0.1 °C 5C 4.7 8C area, 3.9 connection, respectively. This study intended contribute...
The advances and fast spread of mobile devices technologies, we witness today, have extended its advantages over medical health practice supported by devices, giving rise to the growing research Internet Things (IoT), especially e-Health field. features provided technologies revealed be major importance when consider continuous aging population consequent increase debilities. In addition lifetime span population, also risks their locomotive impairments increases, requiring a close monitoring...
Cortisol is a stress biomarker whose chronic elevated levels are associated with higher risk of metabolic syndromes, anxiety, and cardiovascular diseases, among other medical conditions. A new immunosensor based on plasmonic tilted fiber Bragg grating (TFBG) has been developed tested for rapid ultrasensitive cortisol detection. The gold coated TFBG was characterized to surrounding refractive index (SRI) changes functionalized anti-cortisol antibodies via cysteamine. functionalization...
This work proposes a 3D-printed sensor based on fiber Bragg grating (FBG) technology for respiratory rate (RR) and heart (HR) monitoring. Each is composed of single FBG fully encapsulated into 3D-printable
We propose a novel polymer optical fiber (POF) sensing system based on Bragg gratings (FBGs) to measure foot plantar pressure. The pressure signals are detected by five FBGs, in the same piece of cyclic transparent (CYTOP) fiber, which embedded cork insole for dynamic monitoring gait. calibration and measurements performed with suggested presented, results obtained demonstrate accuracy reliability platform monitor distribution during gait motion application This architecture does not...
This paper presents the achievements and progress made on polymer optical fiber (POF) gratings inscription in different types of Fiber Bragg Gratings (FBGs) long period (LPGs). Since first demonstration POFBGs 1999, significant has been where times that were higher than 1 h have reduced to 15 ns with application krypton fluoride (KrF) pulsed laser operating at 248 nm thermal treatments such as pre-annealing fibers. In addition, dopants benzyl dimethyl ketal (BDK) provided a decrease time....
Fiber Bragg gratings are widely used optical fiber sensors for measuring temperature and/or mechanical strain. Nevertheless, the high cost of interrogation systems is most important drawback their large commercial application. In this work, an in-line Fabry-Perot interferometer based edge filter explored in grating dynamic measurements up to 5 kHz. Two devices accelerometer and arterial pulse wave probe were interrogated with developed approach results compared a monitor. The data obtained...
In an era of unprecedented progress in technology and increase population age, continuous close monitoring elder citizens patients is becoming more a necessity than luxury. Contributing toward this field enhancing the life quality with disabilities, work presents design implementation noninvasive platform insole fiber Bragg grating sensors network to monitor vertical ground reaction forces distribution induced foot plantar surface during gait body center mass displacements. The acquired...
In an era of unprecedented progress in sensing technology and communication, health services are now able to closely monitor patients elderly citizens without jeopardizing their daily routines through applications on mobile devices what is known as e-Health. Within this field, we propose optical fiber sensor (OFS) based system for the simultaneous monitoring shear plantar pressure during gait movement. These parameters considered be two key factors analysis that can help early diagnosis...
Fiber Bragg gratings (FBGs) are known for their uses in applications ranging from civil engineering to medicine. A bare FBG is small and light; hence, it can be easily embedded into hosting materials. However, conventional fabrication methods generally time-consuming with reproducibility issues. more recent strategy has been proposed develop novel FBG-based systems by encapsulating the grating within 3-D-printed structures. This process, as 3-D printing, characterized several advantages like...
Central arterial pulse pressure monitoring has been considered a key factor in hypertension assessment and cardiovascular prevention. In this paper, it is presented an intensity-based plastic optical fiber sensor for noninvasive of the carotid waveform. The advantages sensing method are low implementation cost, high robustness, signal processing simplicity. showed suitable sensitivity to movements up 370 μm, with displacement resolution 0.1 μm. As preliminary proof concept, was used detect...
This paper presents the characterization of polymer optical fibers (POFs) submitted to catastrophic fuse effect towards intensity-variation-based sensing strain, transverse force, temperature, and moisture. In experiments, POFs with without are tested results compared respect sensitivity, linearity, root mean squared error (RMSE). The fused have higher linearity lower RMSE than non-fused in strain force sensing. Also, sensitivity is temperature sensing, which can be related curvature that...
Invisible health monitoring is currently a topic of global interest within the scientific community. Sensorization everyday objects can provide valuable information without requiring any changes in people's routines. In this work, feasibility study photoplethysmography (PPG) acquisition lower limbs for continuous and real-time vital signs, including heart rate (HR) respiratory (RR), presented. The proposed system uses two MAX30102 sensors to obtain PPG signals from back thigh. As proof...