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

Tiago Paixão; Francisco Araujo; Paulo Antunes

doi:10.1117/12.2539964

28 August 2019 High-resolution strain and temperature Fabry-Pérot interferometer sensor based on Vernier effect and produced by a femtosecond laser

Tiago Paixão, Francisco Araujo, Paulo Antunes

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111992U (2019) https://doi.org/10.1117/12.2539964
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

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.

Citation Download Citation

Tiago Paixão, Francisco Araujo, and Paulo Antunes "High-resolution strain and temperature Fabry-Pérot interferometer sensor based on Vernier effect and produced by a femtosecond laser", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111992U (28 August 2019); https://doi.org/10.1117/12.2539964

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