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Etched Fiber Bragg Grating Sensor for Nitrate Sensing Application

We demonstrate a reliable method to detect the concentration of Nitrate in water using an etched Fiber Bragg Grating (FBG) sensor. The sensor was etched using 48% Hydrofluoric (HF) acid solution to function as a chemical sensor and interact with Nitrates. The Bragg wavelength (λ b) shifted due to the changes of Nitrate concentration. The sensitivity achieved by this sensor is 2.4 x 10-3nm/ppm. The overall shift of the Bragg wavelength is 0.12 nm from 0 – 50 ppm.