Multilevel temperature threshold sensor based on Photonic Crystal Fiber transducers

In the paper we have presented a multilevel temperature threshold sensor. The sensor's transducers were made by filling a commercially available Photonic Crystal Fiber — LMA-10. As a filling material we used a selected group of n-alkanes with different melting points. We have prepared a set of transducers and they were tested in an intensity based sensor configuration. The experimental results of the four transducers' sensors showed that it is possible to distinguish five threshold levels from the sensor output signal which were correlated with measured temperatures of ON and OFF states for particular transducers.