Resumen

LOZANO-HERNANDEZ, T. et al. Phase signal analysis for high-sensitive temperature fiber-optic external Fabry-Perot-cavity sensor. Rev. mex. fis. [online]. 2024, vol.70, n.5, e051302.  Epub 07-Oct-2025. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.70.051302.

We experimentally demonstrate a highly temperature-sensitive external Fabry-Perot cavity. The interferometric structure is composed of an air-microcavity; its fabrication uses a microcapillary and UV polymer. A temperature sensitivity close to 5.7 nm/°C is achieved with suitable linearity (0.9896) and minimal hysteresis; a phase analysis technique is proposed and applied to overcome the trade-off between sensitivity and range of operation. This technique provides a competitive sensitivity (0.84 rad/°C), good linearity (0.9934), and a range of operation from 25°C to 41°C.

Palabras llave : Fabry-Perot interferometer; optical fiber sensor; temperature measurement; phase signal analysis; polymer.

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