CHARACTERIZATION OF A PIEZOELECTRIC CAP USING A FIBER BRAGG GRATING

摘要

Optical fiber sensor technology based on intra-core Bragg Gratings can be used to measure many different parameters including strain, temperature, pressure, displacement etc. In this work the mechanical deformation of a piezoelectric cap is characterized by means a Fiber Bragg Grating (FBG) at frequencies up to 200kHz. We applied to the piezoelectric material a sinusoidal voltage and we calculated the consequent longitudinal cap's deformation. At the resonance frequency of f_(RES) = 1.5kHz the measured strain ΔL/L is 2.87·10~(-4).