In the present work the characteristics of a set of fibre optic temperature sensors based on the fluorescence lifetime of a neodymium-doped glass have been investigated. The experiment is aimed at assessing the probe-to-probe repeatability and the sensor accuracy. The temperature probes were assembled by placing the Nd-doped glass at the distal end of a silica optical fibre and by splicing the other fibre end to a 1x2 wavelength-independent coupler. The probes were calibrated, in the temperature range 0 deg C to 250 deg C, by comparison against a platinum resistance thermometer in a metal block furnace. The calibration results and the temperature repeatability of the Nd: glass probes are reported. The reproducibility of the measurement method and the resulting accuracy are discussed.
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