Abstract

In this work, several temperature sensors were produced and encapsulated using Bragg fiber optic gratings (FBG). The FBGs were recorded in the infrared bands using standard telecommunication single-mode optical fiber (G-652). The fiber used does not undergo thermal pre-treatment in the production of standard FBG and undergoes a previous hydrogenation process to produce the regenerated Bragg gratings (RFBG). In the RFBG production process we use heat treatment at 850°C and the resulting gratings can be applied in long term measurements at temperatures lower than that of regeneration. FBGs and RFBGs were encapsulated with ceramic material alumina (Al₂O₃) and stainless steel to facilitate application as a sensor. A comparative study of thermal sensitivity for different capsules and compared with non-encapsulated optical fiber was done.

© 2018 The Author(s)