CONICET | Buscador de Institutos y Recursos Humanos

The use of different pupils for storing each speckled image in speckle photography is employed to determine multiple in-plane rotations. The method consists of recording a four exposure specklegram where the rotations are done between exposures. This specklegram is then optically processed in a whole field approach rendering isothetic fringes which give detailed information about the multiple rotations. It is experimentally demonstrated that the proposed arrangement permits to depict six isothetics in order to measure either six different angles or three non parallel components for two local general in-plane displacements.