Fabrication and properties of large core, high NA, high Nd ³⁺ content multimode optical fibres for temperature sensor applications

High dynamic range temperature point sensor using green fluorescence intensity ratio in erbium-doped silica fiber

“…This behavior is due to the broadening of the homogeneous line width and to the changing population of the energy sublevels with temperature. Rare-earth doped fibers have already been investigated for the development of point [2], distributed [ 3 ] and average [4] temperature sensors.…”

Carbon laminates with RE doped optical fibre sensors

“…In the present study, the luminescence effect in rare earth (RE) doped optical fibre was used to construct temperature sensor. However, luminescence fibre based sensors usually require large core, high numerical aperture (NA) and multimode fibre to increase coupled pump power thereby improving system sensitivity [28,29]. In order to maximize the coupling power, a special multi-core construction of fibre doped with Nd 3+ ions was developed for sensing application.…”

Effect of erbium–ytterbium on the sensitivity of sensors of temperature based on fibre optic preform Er–Yb: BaF2–P2O5

“…This behaviour is due to the broadening of the absorption and emission lines and also to changes with temperature in the populations of the energy sublevels. Temperature sensors using absorption and fluorescence in Nd 3+ -, Yb 3+ -and Eu 3+ -doped bulk glasses have been previously reported [9][10][11][12]. This approach possesses several unique features as compared with conventional methods, giving rise to increasing interest in its application for optical sensing technologies of physical quantities.…”