Digital holography in optics labworks

The paper describes the digital holography experimental bench we used in our engineering school and the results we can acheived for two kind of measures: 1. displacements on the surface of a little plate which can be deformed by a PZT actuator, 2. amplitude of the vibrations when the PZT is excited by a sinusoidal signal. This experiment bench have also been used for vibration mode analysis of an electrical motor in collaboration with a research laboratory. It is a very useful experiment to teach techniques using coherent light, and also features of numerical acquisition of images.