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About

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.

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Publications

2019

High sensitivity strain sensor based on twin hollow microspheres

Authors
Monteiro, CS; Kobelke, J; Schuster, K; Bierlich, J; Silva, SO; Frazao, O;

Publication
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
A sensor based on 2 hollow core microspheres is proposed. Each microsphere was produced separately through fusion splicing and then joined. The resultant structure is a Fabry-Perot interferometer with multiple interferences that can be approximated to a 4-wave interferometer. Strain characterization was attained for a maximum of 1350 mu epsilon, achieving a linear response with a sensitivity of 3.39 +/- 0.04 pm/mu epsilon. The fabrication technique, fast and with no chemical hazards, as opposed to other fabrication techniques, makes the proposed sensor a compelling solution for strain measurements in hash environments.

2019

Bi-core optical fiber for sensing o temperature, strain and torsion

Authors
Lobo Ribeiro, ABL; Silva, SFO; Frazao, O; Santos, JL;

Publication
MEASUREMENT SCIENCE AND TECHNOLOGY

Abstract
Bi-core optical fiber structures are studied for applications in sensing. In this paper, an analysis is performed on the spectral characteristics of light propagating in these fibers with central launching core illumination from a standard single mode fiber. Reflective and transmissive configurations are addressed. The characteristics of a reflective bi-core fiber structure for measurement of strain, temperature and absolute value of torsion are investigated and highlights for further research are presented.

2018

Analysis of amplification in a fiber ring resonator with a fabry-perot cavity

Authors
Magalhaes, R; Silva, S; Frazao, O;

Publication
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
The placement of an Erbium-doped Fiber Amplifier and a Fabry-Perot cavity inside a fiber ring resonator can generate a sinusoidal modulation in the optical signal obtained. The characterization of this behavior is achieved by changing the length of the Fabry-Perot cavity, which acts as a sensing device. A theoretical model of the optical signal modulation obtained with such configuration is also presented.

2018

Ring-Down Technique Using Fiber-Based Linear Cavity for Remote Sensing

Authors
Silva, S; Frazao, O;

Publication
IEEE Sensors Letters

Abstract

2017

Multimode interference-based fiber sensor in a cavity ring-down system for refractive index measurement

Authors
Silva, S; Frazao, O;

Publication
OPTICS AND LASER TECHNOLOGY

Abstract
This work reports a multimode interference-based fiber sensor in a cavity ring-down system (CRD) for sensing temperature-induced refractive index (RI) changes of water. The sensing head is based in multimodal interference (MMI) and it is placed inside the fiber loop cavity of the CRD system. A modulated laser source was used to send pulses down into the fiber loop cavity and an erbium-doped fiber amplifier (EDFA) was placed in the fiber ring to provide an observable signal with a reasonable decay time. The behavior of the sensing head to temperature was studied due to its intrinsic sensitivity to said parameter - a sensitivity of -1.6x10(-9) mu s/degrees C was attained. This allowed eliminating the temperature component from RI measurement of water and a linear sensitivity of 580 mu s/RIU in the RI range of 1.324-1.331 was obtained. The use of a MMI fiber sensor in the proposed CRD configuration allowed achieving a sensitivity similar to 4-fold than that obtained with a tilted fiber Bragg grating and similar to 2-fold than that when a micrometric channel inscribed in the fiber was used.