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Details

Details

  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    paulo.robalinho@inesctec.pt
Publications

2021

Nano-Displacement Measurement Using an Optical Drop-Shaped Structure

Authors
Robalinho, P; Frazao, O;

Publication
IEEE Photonics Technology Letters

Abstract

2021

Colossal enhancement of strain sensitivity using the push-pull deformation method

Authors
Robalinho, P; Gomes, A; Frazao, O;

Publication
IEEE Sensors Journal

Abstract

2021

Giant Displacement Sensitivity Using Push-Pull Method in Interferometry

Authors
Robalinho, P; Frazao, O;

Publication
Photonics

Abstract
We present a giant sensitivity displacement sensor combining the push-pull method and enhanced Vernier effect. The displacement sensor consists in two interferometers that are composed by two cleaved standard optical fibers coupled by a 3 dB coupler and combined with a double-sided mirror. The push pull-method is applied to the mirror creating a symmetrical change to the length of each interferometer. Furthermore, we demonstrate that the Vernier effect has a maximum sensitivity of two-fold that obtained with a single interferometer. The combination of the push-pull method and the Vernier effect in the displacement sensors allows a sensitivity of 60 ± 1 nm/µm when compared with a single interferometer working in the same free spectral range. In addition, exploring the maximum performance of the displacement sensors, a sensitivity of 254 ± 6 nm/µm is achieved, presenting a M-factor of 1071 and MVernier of 1.9 corresponding to a resolution of 79 pm. This new solution allows the implementation of giant-sensitive displacement measurement for a wide range of applications.

2020

High Enhancement Strain Sensor based on Vernier Effect using 2-Fiber Loop Mirrors

Authors
Ribeiro Robalinho, PMR; Gomes, AD; Frazao, O;

Publication
IEEE Photonics Technology Letters

Abstract

2019

Fiber microsphere coupled in a taper for a large curvature range

Authors
Robalinho, P; Frazao, O;

Publication
Fibers

Abstract
This work consists of using an optical fiber microsphere as a sensor for a wide range of curvature radii. The microsphere was manufactured in a standard fiber with an electric arc. In order to maximize system efficiency, the microsphere was spliced in the center of a taper. This work revealed that the variations of the wavelength where the maxima and minima of the spectrum are located varies linearly with the curvature of the system with a maximum sensitive of 580 ± 20 (pm km). This is because the direction of the input beam in the microsphere depends on the system curvature, giving rise to interferometric variations within the microsphere. © 2019 by the authors.