A Combination of a 3 Step Temporal Phase Algorithm and a High Speed Interferometer System for Dynamic Profile Measurements

This work presents the application of a temporal phase algorithm on a high speed optical interferometry vibration study. The object is a rectangular plate clamped on its four sides. The dynamic event of a complete cycle of vibration is registered by means of a high speed electronic speckle pattern interferometry system (HS ESPI). The HS ESPI system contains a CMOS camera set at 4000 frames per second leaving the shutter widely open all the time. A group of intensity patterns of interference are recorded, different sets of fringe patterns along the cycle of vibration come from the subtraction of the intensity patterns of interference and are processed by a three-frame temporal phase measurement method to recover the phase of deformation of the plate. The result is reported and is also compared with the mechanical phase described on the theory.