LAUSR

Abstract A hybrid sensor, for temperature and strain discrimination, comprising a Fiber Bragg grating (FBG) and two Fabry-Perot interferometers (FPIs) both fabricated by a femtosecond laser system is presented. The Vernier effect was used to magnify the sensitivity of one interferometer by, approximately, 95 times, reaching sensitivities of (1050 ± 20) pm/°C and (113 ± 2) pm/µe. In this way, cross-sensitivity issues could be overcome by simply using the matricial method to discriminate temperature and strain variations. The simple fabrication method allied to the customizable sensitivity of the hybrid sensor, allows the use of this type of devices in many industrial and research fields, in which high resolutions and production reliability are essential requirements.