Strain dependence of fluorescence from rare-earth-doped optical fibres: application to the simultaneous, co-located, measurement of strain and temperature

Strain sensitivities of various optical fibre temperature sensors based on the fluorescence from rare-earth-doped fibre are presented. Their properties depend upon the dopant ion used and its concentration. These sensors may be co-located with other sensors such as Bragg gratings to provide a simultaneous measurement of strain and temperature, with the possibility of reduced uncertainties compared with other simultaneous measurement arrangements involving two sensors.