OPTICAL SENSOR, PROCESS FOR MAKING SUCH SENSOR AND EVALUATION SYSTEM COMPRISING AT LEAST ONE OF SUCH SENSORS

An optical sensor (1) is described, comprising: an operating portion (3) aimed to be integrated, incorporated or immersed in at least one matrix (2) composed of one or more polymeric materials and/or composites thereof to optically guide an incoming optical signal (LI) and an outgoing optical signal (LO), the operating portion (3) comprising a portion (4) for entering the incoming optical signal (LI) and/or for exiting the outgoing optical signal (LO); a sensitive section made of optical fiber core (5) externally placed in direct contact with the matrix (2); an optically reflecting terminal section (7) placed in direct contact with the matrix (2), the terminal section (7) being adapted to optically reflect the incoming optical signal (LI) to transform it into the outgoing optical signal (LO); and a protecting covering section (9) of the optical fiber. A process for making of such optical sensor (1) and an evaluation system comprising at least one of such optical sensors (1) are also described.