Intrinsic Fabry-Pérot cavity sensor based on chemical etching of a multimode graded index fiber spliced to a single mode fiber
P. A. R. Tafulo, O. Frazão, P. A. S. Jorge, F. M. Araújo, INESC Porto - Institute for Systems and Computers Engineering of Porto (Portugal)
An intrinsic Fabry-Pérot cavity for high temperature and strain measurement is presented. The in-fibre cavity is formed by a chemical etched graded index optical fiber spliced to a single mode fiber. The intrinsic sensor obtained shows high sensitivity to strain (6.2 pm/με) and rather low sensitivity to temperature (0.9 pm/ºC), being suitable for applications as a strain gauge at high temperature.
