The paper deals with a new multifiber temperature sensor, based on the rela
tionship between temperature and the refractive index of a suitable referen
ce liquid, which replaces a part of the fiber cladding. The sensing element
, the microcontroller-based hardware, and the artificial neural network (AN
N)-based measurement software are described. The results of the tests carri
ed out in the range 40 degrees C-110 degrees C showed good prototype accura
cy and repeatability (both contained within +/-0.5 degrees C).