Comparison of 3D deformations measured by combined speckle metrology methods with results from numerical simulations
Department of Prosthetic Dentistry and Biomaterials, University of Muenster; 2 Biomedical Technology Center of the Medical Faculty, University of Muenster; 3 Institute of Applied Physics, University of Muenster
Abstract
Optical measurement techniques provide the necessary sensitivity to determine microscopic deformations for non-destructive analyses of the mechanical behavior of hard tissue and biomaterials. Such problems are usually investigated numerically by finite element analysis. However, the validation and optimization of these simulations require a comparison of numerical results with measured data. The measurement system proposed for this task combines electronic speckle pattern interferometry with digital speckle photography by using the Fourier-transform method to reconstruct the object wave’s phase and intensity distributions for the acquisition of microscopic 3D deformations. Simultaneously, in combination with photogrammetric 3D shape acquisition by digital image correlation of a projected laser speckle pattern, macroscopic shape and macroscopic deformations are determined. The accuracy and measurement range of the measurement system are investigated and optimized. Using the resulting configuration, the deformation of a jaw model due to mechanical loading of an inserted dental implant is measured. The results are compared with those obtained by a finite element analysis.