Multiparameter sensor based on hollow square core optical fiber

João P. Santos; Diana Pereira; Jörg Bierlich; Jens Kobelke; Micael Nascimento; Marta Ferreira

doi:10.1117/12.2678539

23 May 2023 Multiparameter sensor based on hollow square core optical fiber

João P. Santos, Diana Pereira, Jörg Bierlich, Jens Kobelke, Micael Nascimento, Marta Ferreira

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 1264338 (2023) https://doi.org/10.1117/12.2678539
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

A Fabry Perot (FP) based fiber sensor for multiparameter measurement is proposed. The sensor is constituted by a short section of a hollow square core fiber (HSCF) spliced between a single mode fiber and a long section of a silica capillary tube. In a reflection scheme, several FP cavities are enhanced in different areas of the HSCF. In a single 439 μm long sensing head, three FP cavities are excited. Using the Fourier band-pass filter method, each cavity was individually monitored towards variations of pressure, temperature, and curvature. The maximum sensitivities of (3.23 ± 0.04) nm/MPa, (9.6 ± 0.3) pm/°C, and (-32 ± 1) pm/m^-1 were obtained for pressure, temperature, and curvature, respectively within a measurement range of 0.4 MPa, 110°C, and 9 m^-1. The distinct responses of the FP cavities to the measurands allow for a triple-hybrid application of the sensor towards simultaneous measurement of pressure, temperature, and curvature. The proposed sensor is robust with simple fabrication and small dimensions, revealing promising to be employed in a wide range of applications where the measurement of several physical parameters is required.

Citation Download Citation

João P. Santos, Diana Pereira, Jörg Bierlich, Jens Kobelke, Micael Nascimento, and Marta Ferreira "Multiparameter sensor based on hollow square core optical fiber", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 1264338 (23 May 2023); https://doi.org/10.1117/12.2678539

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KEYWORDS

Tunable filters

Sensors

Silica

Reflection

Single mode fibers

Temperature metrology

Bandpass filters

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