Angle transducer based on fiber Bragg gratings able for tunnel auscultation
A. Quintela, J. M. Lázaro, M. A. Quintela, J. Mirapeix, V. Muñoz-Berti, J. M. López-Higuera, University of Cantabria (Spain)
In this paper an angle transducer based on Fiber Bragg Grating (FBG) is presented. Two gratings are glued to a metallic platen, one in each side. It is insensitive to temperature changes, given that the temperature shifts affect equally to both FBG. When the platen is uniformly bent an uniform strain appears in both sides of the platen. It depends on the bend angle and the platen length and thickness. The transducer has been designed to be used in the auscultation of tunnels during their construction process and during their live time. The transducer design and its characterization are presented.
