Abstract
We demonstrate an optical fiber sensor based on the green up-conversion emission of rare-earth active ions hosted by a polymer matrix. The temperature sensitive composite material is fabricated by simple mixing of the rare-earth ions in powder form () with the polymer (polydimethylsiloxane). This fluorescent material is then incorporated on the tip of silica-glass optical fibers to obtain a point temperature sensor probe. Temperature measurements are obtained through the fluorescent intensity ratio technique, yielding a linear response and minimizing spurious effects on the up-conversion fluorescence signal. The fiber sensors fabricated with this material provide good performance within a temperature range of 20–100°C, excellent linearity (), and good thermal and fluorescent stability.
© 2019 Optical Society of America
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