Deformation, displacement and vibration investigations in manufacturing applications using a new hologram interferometry technique

The use of sandwich hologram interferometry makes it possible to investigate objects of interest to an engineer that is was not possible to investigate before. The paper presents the sandwich technique as well as some different applications of the technique. Static deformation of a milling machine and a dynamic study on a vibrating hand-drill are included. Another application is a study of a test object one metre in length, where the object was removed from the holographic set-up between exposures and holes were drilled in one wall of the object. The deformation around the drilled holes could be studied, after that a second recording of the object repositioned in the holographic set-up was performed. Finally it is shown how an in-plane rigid body motion of 1 mm could be compensated for, and a tilt of 1.5 × 10 ^-3 degrees of a special test object evaluated in spite of the large translation motion.