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Quasi-distributed fibre-optic chemical sensing using telecom optical fibre

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5 Author(s)
Murphy, V. ; Sch. of Phys. Sci., Dublin City Univ. ; McCraith, B.D. ; Butler, T. ; McDonagh, C.
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Quasi-distributed chemical sensing using telecommunications grade fibre is reported for the first time. Using graded index fibre, an etched cavity at each fibre tip is filled with sol-gel-derived-silica in which an analyte-sensitive reagent is entrapped. A standard optical time domain reflectometer system, interrogating three such sensors based on a pH sensitive NIR absorbing dye was used to prove the principle of this approach

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Electronics Letters  (Volume:33 ,  Issue: 7 )