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Susana Novais is graduated in Biomedical Engineering from the Bragança Polytechnic Institute, Portugal. In 2019 she received the Ph.D. degree in Physical Engineering at the University of Aveiro, Portugal, on optical fiber sensors for challenging media. In last 5 years, she has published about 21 papers in international journal, book chapters and conference proceedings. Her field expertise is optical fiber sensors applied to the lithium ion batteries, optical fiber designs and their applications in chemically challenging media. She is currently an Assistant Researcher at the Center for Applied Photonics (CAP) at INESC TEC and her current research interests are optical fiber sensors for medical applications.

Interest
Topics
Details

## Details

• #### Name

Susana Novais
• #### Cluster

Networked Intelligent Systems
• #### Role

Assistant Researcher
• #### Since

01st April 2019

Portugal
• #### Centre

Applied Photonics
• #### Contacts

+351220402301
susana.novais@inesctec.pt
002
Publications

2022

### The effect of frequency modulation on the FSR of a Fabry-Perot cavity using an Optical Spectrum Analyser

Authors
Reis, J; V.Rodrigues, A; Robalinho, P; Novais, S; Maia, J; Marques, P; Roma, D; Salvans, J; Canal, M; Ramos, J; Gualani, V; Sisteré, S; Martín, V; Nofrarias, M; Silva, S; Frazão, O;

Publication
EPJ Web of Conferences

Abstract
It is presented a study of the dependence between the free spectral range (FSR) and the cavity length in Fabry-Perot interferometers. Furthermore, the effect of frequency modulation on the FSR is studied when an optical spectrum analyser (OSA) is used as an interrogator. For low frequency range it is possible to observe this behaviour in the OSA and using an appropriate processing signal it is possible to use the white light interferometry technique.

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

### Multiparameter Sensor Based on a Multi-Interferometric Serial Configuration for Temperature and Strain Measurements

Authors
Perez-Herrera R.A.; Bravo M.; Leandro D.; Novais S.; Pradas J.; Lopez-Amo M.;

Publication
IEEE Journal of Selected Topics in Quantum Electronics

Abstract
In this work, a multi-parameter point sensor based on the combination of Fabry-Perot (FP) and the anti-resonant (AR) reflecting guidance in cascade configuration is proposed and experimentally demonstrated. This structure, based on FP interference and AR reflecting guidance, was fabricated with two different air micro-cavities. The attained experimental results showed different strain and temperature sensitivities for the antiresonance contribution. However, when analyzing the FP interference, only strain sensitivity was observed, demonstrating that this air micro-cavity was also insensitive to temperature variations.

2021

### Characterization of an hollow core PCF for endoscopy applications: A proof concept

Authors
Marques J.; Novais S.; Silva S.; Frazao O.;

Publication
2021 Telecoms Conference, ConfTELE 2021

Abstract
Two distinct optical fibers for endoscope-based configurations are demonstrated and studied in this work. The fibers used for the experiment consist of: a conventional singlemode fiber (SMF 28e) and a hollow core photonic crystal fiber (HC-PCF) based on silica. Two studies that allowed the characterization of these fibers, according to their optical output power and when subjected to curvature, were carried out. The intensity power profile was also analysed in relation to the propagation distance, transversal displacement and incidence angle. After this study it can be concluded that the most suitable solution for the endoscope is the HC-PCF fiber working as a transmission probe. For the proof of concept of the fiber-based endoscope, a cleaved multimode fiber (MMF) tip was used as a reception probe and its reflection efficiency was also analysed.

2020

### Curvature detection in a medical needle using a Fabry-Perot cavity as an intensity sensor

Authors
Novais, S; Silva, SO; Frazao, O;

Publication
MEASUREMENT

Abstract
The use of optical sensors inside the needle can improve targeting precision and can bring real-time information about the location of the needle tip if necessary, since a needle bends through insertion into the tissue. Therefore, the precise location of the needle tip is so important in percutaneous treatments. In the current experiment, a fiber sensor based on a Fabry-Perot (FP) cavity is described to measure the needle curvature. The sensor is fabricated by producing an air bubble between two sections of multimode fiber. The needle with the sensor therein was attached at one end and deformed by the application of movements. The sensor presents a sensitivity of -0.152 dB/m-1 to the curvature measurements, with a resolution of 0.089 m-1. The sensory structure revealed to be stable, obtaining a cross-sensitivity to be 0.03 m-1/°C. © 2019 Elsevier Ltd