Journal
OPTICS AND LASER TECHNOLOGY
Volume 90, Issue -, Pages 96-101Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2016.11.005
Keywords
Etched multimode optical fiber; Evanescent field; Fiber optic sensor; Hydrothermal; Relative humidity (RH) sensor; Zinc oxide nanorods
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Funding
- Research Council of the University of Yasouj [Gryu-89131101]
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In this work, the multimode optical fiber size effects on the performances of the clad-modified fiber with ZnO nanorods relative humidity (RH) sensor were experimentally investigated. Simple and controlled chemical etching method through on line monitoring was used to prepare different fiber waist diameter with long length of 15 mm. More precisely, the competition behavior of sensor performances with varying fiber waist diameter was studied to find appropriate size of maximizing evanescent fields. The obtained results revealed that evanescent wave absorption coefficient (gamma) enhanced more than 10 times compare to bare fiber at the proposed optimum fiber diameter of 28 mu m. Also, high linearity and fast recovery time about 7 s was obtained at the proposed fiber waist diameter. Applicable features of the proposed sensor allow this device to be used for humidity sensing applications, especially to be applied in remote sensing technologies.
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