Effective devices for the monitoring of chloride ions are required in industry this work reports on the development of a
reflective long period grating-based senor for the measurement of chloride ions in solution. The device is based around a
long period fibre grating (LPG)-based Michelson interferometer where the sensor was calibrated and evaluated in the
laboratory using sodium chloride solutions, over a wide range of concentrations, from 0.01 M to 4.00 M. The grating
response yields shifts in the spectral characteristic of the interferometer, due to the change of refractive index of the
solution surrounding it. The work was stimulated by the need for the more effective measurement of the ingress water-borne
ions in structural concrete. It was found that the sensitivity of the device could be enhanced over that obtained
from a bare LPG by coating the LPG-based interferometer with gold nanoparticles. Devices using this approach were
also evaluated and their performance cross-compared.
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