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High-resolution strain and temperature Fabry-Pérot interferometer sensor based on Vernier effect and produced by a femtosecond laser
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Paper Abstract

In this work, we report on a simple, but highly sensitive sensor based on two intrinsic Fabry-Pérot interferometers (FPI) inscribed in a standard optical fiber. A brief theoretical study on the Vernier effect is presented, followed by a simulation of the FPIs physical characteristics to achieve the desired sensitivity enhanced factor. Based on the simulation results, the FPIs were fabricated using a custom micromachining setup based on a near-infrared femtosecond laser and a motorized XYZ platform. A real-time monitoring was performed throughout the entire process, by visualizing the inscription with a CCD camera and recording the resulted spectra. High-resolution was demonstrated for the manufactured devices, achieving, in the best-case, values of ~7 nε and 0.001°C for strain and temperature, respectively. The sensor’s performance allied with its versatile and customizable configuration allows an operando and in-situ strain and temperature monitoring under harsh environments.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111992U (28 August 2019); doi: 10.1117/12.2539964
Show Author Affiliations
Tiago Paixão, Univ. de Aveiro (Portugal)
Francisco Araujo, HBM FiberSensing S.A. (Portugal)
Paulo Antunes, Univ. de Aveiro (Portugal)
Instituto de Telecommuniçaões (Portugal)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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