P3.2 - Interrogating Water Content in Organic Solvents by Planar Bragg Grating Sensor

S. Belle, S. Scheurich, R. Hellmann, S. So, I. J. G. Sparrow & G. D. Emmerson
We report on a planar Bragg grating evanescent field refractive index sensor capable of monitoring online the water content in organic solvents in the range from 0-100%. The sensor structure consists of a Bragg Grating buried in a planar multilayer silica on silicon structure in which both the waveguide and Bragg grating are introduced by UV radiation. Using this sensor, we have investigated the influence of varying water content on the reflected Bragg wavelength, i.e....