http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/446 2013-05-20T04:25:33Z 2013-05-20T04:25:33Z Sivasankara Pillai, V N Radhakrishnan, P V P N Nampoori Girijavallabhan, C P Suresh Kumar, P http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/1770 2010-07-12T20:30:56Z 2002-03-08T00:00:00Z

A fibre optic evanescent wave sensor used for the detection of trace nitrites in water Sivasankara Pillai, V N; Radhakrishnan, P; V P N Nampoori; 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