Optical fibre long period grating based chemical sensor for the analysis of silica in boiler water Online publication date: Thu, 19-Aug-2021
by Aji Balan Pillai; Benjamin Varghese Pandikudy; Kottarathil Naduvil Madhusoodanan
International Journal of Computer Aided Engineering and Technology (IJCAET), Vol. 15, No. 2/3, 2021
Abstract: Silica deposits in turbine blades, boiler tubes and cooling water circuits lead to serious loss in efficiency of power plants. Hence silica deposition is one parameter that is seriously monitored in power stations. Fibre optic sensors, especially long period grating sensors have been found to offer a convenient method for the accurate determination of silica in boiler water. We are hereby reporting the design, development and characterisation of a novel long period grating-based fibre optic sensor for the accurate analysis of silica. A highly sensitive LPG is fabricated. Suitable set up consisting of a Teflon cell, a broad band source and an optical spectrum analyser is developed. The reactive silica measurement is carried out using the heteropoly blue colorimetric method. Detailed analysis of silica is done using the developed sensor, a spectrophotometer and an evanescent wave fibre optic sensor and the results are provided.
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