Optical fiber encoder based on phase shifting interferometry

In an automated industrial system monitoring and controlling the position of moving objects represents a crucial element in processes that have rotating systems.This is regularly in robots that use internal sensors to monitor the position of their joints. In this work we present the study of an optical encoder based on a Mach Zehnder interferometer. To determine the phase, the Phase Shift Interferometry algorithm was use, using five steps. The optical fiber encoder used the rotation matrix, and the results were correlated with those obtained by the optical technique, the reported behavior shows a wide similarity between the optical encoder and the simulated. The experimental design showed a differential distance of 0.0452 rad between the initial and that obtained after deformation. We report an encoder capable of recovering the initial phase, showing a difference in the correlation of 0.0000925 u.a.