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Title:
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A fibre optic evanescent wave sensor used for the detection of trace nitrites in water |
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Author:
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Sivasankara Pillai,V N; Radhakrishnan, P; Nampoori, V P N; Girijavallabhan, C P; Suresh, Kumar P
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Abstract:
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A fibre optic technique for detecting trace amounts of nitrite compounds in
water is described. The off-line fibre optic sensor outlined here is based on
evanescent field absorption in a test solution formed by the reaction of nitrite
compounds in water with suitable chemical reagents. A short unclad portion
of a plastic clad silica fibre acts as the sensing region. The experimental
results clearly establish the usefulness of the present technique for detecting
very low concentrations of the order of 1 ppb (parts per billion) of nitrite
compounds with a large dynamic range of 1–1000 ppb. Such a high
sensitivity enables the present device to be used for measuring the nitrite
content in drinking water. |
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URI:
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http://dyuthi.cusat.ac.in/purl/1770
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Date:
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2002-03-08 |