Real-Time Holographic Interferometry using Photorefractive Bi12SiO20 Crystals and their applications in Surfaces Analysis with Phase-Stepping Technique

This work searches to develop and to optimize a holographic interferometer that it uses the photorefractive Bi12SiO20 (BSO) crystals in diffusive regimen with configuration exhibiting diffraction anisotropy for RealTime Holographic Interferometry (RTHI) and applications in surfaces analysis. In RTHI with photorefractive BSO crystals, the writing-reading hologram process is made in real-time in diffusive regimen, with configuration exhibiting diffraction anisotropy. This device is connected with an interferogram-analysis method that uses the phase-stepping technique for quantitative measurement of surfaces displacements and deformations. So we captured holographic interferograms from analyzed surface, and calculated the phase map using the digitalized images with a software of microcomputer, then another program removed the wrapping of tangent function (unwrapping), using the Cellular-Automata technique, where obtained good results.