Fiber optic sensors for CMS-CERN

In this paper we present the activity that our research group is making on Fiber Optic Sensors (FOS) applications to monitor high-energy physics (HEP) experiments. Starting from the consideration that Fiber Optic radiation hardness has been widely proven, we have applied the technology of Fiber Optic Sensors to this very relevant field of interest. Here, we give the experimental evidences of the possibility to use such a class of sensors also in these very complex environmental side conditions. In particular, regarding the Compact Muon Solenoid (CMS) experiment at the CERN, we have monitored temperatures and strains in different locations by using Bragg Grating sensors, and we are now starting the development of a new class of Relative Humidity sensor based on Fiber Optic technology. Preliminary results are very encouraging, letting us consider the use of FOS technique as a robust and effective solution for monitoring requirements in HEP detectors for other physical and environmental parameters.