Spatially resolved stress measurements in materials with   polarization-sensitive optical coherence tomography: image acquisition and   processing aspects
  We demonstrate that polarization-sensitive optical coherence tomography (PS-OCT) is suitable to map the stress distribution within materials in a contactless and non-destructive way. In contrast to transmission photoelasticity measurements the samples do not have to be transparent but can be of scattering nature. Denoising and analysis of fringe patterns in single PS-OCT retardation images are demonstrated to deliver the basis for a quantitative whole-field evaluation of the internal stress state of samples under investigation. 
Bettina Heise, Karin Wiesauer, Erich G\"otzinger, Michael Pircher,   Christoph K. Hitzenberger, Rainer Engelke, Gisela Ahren...
physics.optics