Nowdays, polymers like hydrogels that respond to well defined stimuli, have a particular interest in fields like
optoelectronics, biotechnology, materials, etc. One of this polymers is the NIPAAM, that posses thermo optics
properties. This work is oriented to the design and implementation of a temperature sensor using fiber optics and having
as sensitive part a sintetized hydrogel of polyNIPAAM and MeOXA of reversible thermosensible characteristics. For this
setup we use a glass ampoule which is coupled to two pieces of plastic, inside the ampoule it is placed the hydrogel. The
working principle relies in the turbidity changes in a well known temperature called critical. We present the experimental results of the designed and implemented device.