V N Sivasankara Pillai
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/1766
2024-02-07T17:42:51ZA fibre optic evanescent wave sensor used for the detection of trace nitrites in water
https://dyuthi.cusat.ac.in:443/xmlui/handle/purl/1770
A fibre optic evanescent wave sensor used for the detection of trace nitrites in water
Sivasankara Pillai,V N; Radhakrishnan, P; Nampoori, V P N; Girijavallabhan, C P; Suresh, Kumar P
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.
2002-03-08T00:00:00Z