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Machavaram, Venkata
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article
Fabrication of intrinsic fibre Fabry–Perot sensors in silica fibres using hydrofluoric acid etching
Abstract
When a cleaved optical fibre is immersed in hydrofluoric acid, the compositional variation within the core and the cladding results in the core-region being etched at a faster rate. This paper presents details of the experimental procedures that were used to etch SM 800 optical fibres and the characterization of the micro-cavities using a 3D surface profiler, optical and scanning electron microscopy. Two such acid-etched fibres were fusion spliced to create an intrinsic Fabry-Perot cavity. These strain sensors were surface-mounted on to fibre reinforced composite test specimens and subjected to quasi-static and cyclic loading. The intrinsic fibre Fabry-Perot sensors were interrogated using low-coherence interferometry. The output from the intrinsic Fabry-Perot sensors showed excellent correlation with surface-mounted electrical resistance strain gauges during quasi-static and cyclic loading. (c) 2007 Elsevier B.V. All rights reserved.