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Susana Silva is graduated in Applied Physics from the University of Porto, Portugal. She received the Ph.D. degree in Physics at the University of Porto, Portugal, on optical fiber sensors for refractive index and gas sensing. She is currently an R&D Researcher at the Center for Applied Photonics at INESC TEC. In the last few years, S. Silva has published more than 50 papers in international journals. S. Silva received the prize for best PhD Theses in Optics and Photonics of 2013. Her field of expertise is the fabrication of optical fiber sensors for monitoring of physical parameters. Her current research interests are optical sensors for biomedical applications and distributed fiber optic sensing for biodiversity applications.

Interest
Topics
Details

## Details

• #### Name

Susana Oliveira Silva
• #### Cluster

Networked Intelligent Systems
• #### Role

Assistant Researcher
• #### Since

01st March 2005

Portugal
• #### Centre

Applied Photonics
• #### Contacts

+351220402301
susana.o.silva@inesctec.pt
006
Publications

2021

### Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Authors
Raposo, M; Xavier, C; Monteiro, C; Silva, S; Frazao, O; Zagalo, P; Ribeiro, PA;

Publication
Photonics

Abstract
Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

2021

### Acoustic Optical Fiber Sensor Based on Graphene Oxide Membrane

Authors
Monteiro, CS; Raposo, M; Ribeiro, PA; Silva, SO; Frazao, O;

Publication
Sensors

Abstract
A Fabry–Pérot acoustic sensor based on a graphene oxide membrane was developed with the aim to achieve a faster and simpler fabrication procedure when compared to similar graphene-based acoustic sensors. In addition, the proposed sensor was fabricated using methods that reduce chemical hazards and environmental impacts. The developed sensor, with an optical cavity of around 246 µm, showed a constant reflected signal amplitude of 6.8 ± 0.1 dB for 100 nm wavelength range. The sensor attained a wideband operation range between 20 and 100 kHz, with a maximum signal-to-noise ratio (SNR) of 32.7 dB at 25 kHz. The stability and sensitivity to temperatures up to 90 °C was also studied. Moreover, the proposed sensor offers the possibility to be applied as a wideband microphone or to be applied in more complex systems for structural analysis or imaging.

2021

### Optical Fiber Sensors for Structural Monitoring in Power Transformers

Authors
Monteiro, CS; Rodrigues, AV; Viveiros, D; Linhares, C; Mendes, H; Silva, SO; Marques, PVS; Tavares, SMO; Frazao, O;

Publication
Sensors

Abstract
Power transformers are central elements of power transmission systems and their deterioration can lead to system failures, causing major disruptions in service. Catastrophic failures can occur, posing major environmental hazards due to fires, explosions, or oil spillage. Early fault detection can be accomplished or estimated using electrical sensors or a chemical analysis of oil or gas samples. Conventional methods are incapable of real-time measurements with a low electrical noise due to time-consuming analyses or susceptibility to electromagnetic interference. Optical fiber sensors, passive elements that are immune to electromagnetic noise, are capable of structural monitoring by being enclosed in power transformers. In this work, optical fiber sensors embedded in 3D printed structures are studied for vibration monitoring. The fiber sensor is encapsulated between two pressboard spacers, simulating the conditions inside the power transformer, and characterized for vibrations with frequencies between 10 and 800 Hz, with a constant acceleration of 10 m/s2. Thermal aging and electrical tests are also accomplished, aiming to study the oil compatibility of the 3D printed structure. The results reported in this work suggest that structural monitoring in power transformers can be achieved using optical fiber sensors, prospecting real-time monitoring.

2021

### Application of a Fiber Optic Refractometric Sensor to Measure the Concentration of Paracetamol in Crystallization Experiments

Authors
Soares, L; Cruz, P; Novais, S; Ferreira, A; Frazao, O; Silva, S;

Publication
IEEE INSTRUMENTATION & MEASUREMENT MAGAZINE

Abstract
A refractometric sensor was applied to measure in real-time the concentration of Active Pharmaceutical Ingredients (APIs) in crystallization experiments. Paracetamol was used as a model system due to the extensive literature available for this API. The refractometric sensor was fabricated by a simple and inexpensive method that consisted in splicing a short section of a multimode fiber to a single mode fiber. The compact geometry of this sensor, with an external diameter of just $125\ \mu\mathrm{m}$, allowed it to measure the concentration of paracetamol, both in a stirred tank crystallizer operating in batch and in an oscillatory flow crystallizer operating continuously. The proposed technique shows the potential to monitor the concentration of APIs in crystallizers of different sizes and geometries as an alternative to more expensive and complex analysis equipment.

2021

### Environmental Sensitivity of Fabry-Perot Microcavities Induced by Layered Graphene-Dielectric Hybrid Coatings

Authors
Peixoto, R; Pires, JPS; Monteiro, CS; Raposo, M; Ribeiro, PA; Silva, SO; Frazao, O; Lopes, JMVP;

Publication
PHYSICAL REVIEW APPLIED

Abstract
We propose a fiber-based environmental sensor that exploits the reflection-phase-shift tunability provided by the use of layered coatings composed of dielectric slabs spaced by conducting membranes. A transfer-matrix study is done in a simplified theoretical model, for which an enhanced sensitivity of the reflection interference pattern to the output medium is demonstrated, in the typical refractive index range of liquid media. An experimental configuration using a cascaded Fabry-Perot microcavity coated by a graphene oxide/polyethylenimine (GO/PEI) multilayered structure is demonstrated. Its cost-effective chemical production method makes graphene oxide-based hybrid coatings excellent candidates for future real-life sensing devices.

Supervised
thesis

2020

### Desenvolvimento de sensores óticos para aplicações biomiméticas

Author
António José Meireles Martins

Institution
IES_Outra

2020

### Raman Endoscopy Using Optical Fiber Technology

Author
João Pedro Marques

Institution
UP-FCUP

2020

### Estudo e desenvolvimento de novas configurações de sensores em fibra ótica para monitorização de cristalizadores na área farmacêutica

Author
Liliana Patrícia Santos Soares

Institution
UP-FEUP

2018

### Estudo e desenvolvimento de sensores refratométricos em fibra ótica para deteção de paracetamol

Author
Liliana Patrícia Santos Soares

Institution
UCP

2018

### Conceptualização e fabricação de sensores em fibra ótica usando impressora 3D para medição de pressões fisiológicas

Author
Maria Silva Miguel

Institution
UCP