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Simultaneous measurement of humidity and temperature by combining a reflective intensity-based optical fiber sensor and a fiber Bragg grating

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4 Author(s)
F. J. Arregui ; Dept. de Ingenieria Electr. y Electron., Univ. Publica de Navarra, Pamplona, Spain ; I. R. Matias ; K. L. Cooper ; R. O. Claus

A novel sensor capable of simultaneously measuring temperature and humidity has been fabricated and demonstrated using optical fiber waveguides. The sensor head is composed of a fiber Bragg grating and a low-finesse Fabry-Perot interferometric cavity. The Fabry-Perot cavity was fabricated using the electrostatic self-assembled monolayer process for the molecular-level deposition of materials of different thicknesses that form a humidity-sensitive coating on the end of the fiber, while the in-line Bragg grating fiber element is used to monitor temperature. Experimental results for a humidity range from 11% to 97% RH and for a temperature range from 10°C to 85°C are shown.

Published in:

IEEE Sensors Journal  (Volume:2 ,  Issue: 5 )