Optical Interferometry for Transient Deformation Analysis

Electronic speckle pattern interferometry is performed for temporal analysis of the surface deformation of vibrating structures. This requires specially designed image processing methods in order to reconstruct the dynamic deformation of an object. The reconstruction procedure which is based on a numerical optimization algorithm is applied on a set of interferometric images recorded by a high speed camera. While designing a phase-recovery algorithm one should also consider the ill-posedness of the problem due to the ambiguity in the recorded interferometric patterns, speckle noise, and electronic noise of the camera. The presented method is applied to reconstruct temporal surface deformation of a violin body under real playing conditions. The results show the feasibility of the algorithm and the correspondence of the calculated intensity images with the experimental data.