In-Plane Strain Measurement By Digital Phase Shifting Speckle Interferometry

A. A.M. Maas; H. A. Vrooman

doi:10.1117/12.962751

25 April 1990 In-Plane Strain Measurement By Digital Phase Shifting Speckle Interferometry

A. A.M. Maas, H. A. Vrooman

Proceedings Volume 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series; (1990) https://doi.org/10.1117/12.962751
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

A digital phase shifting speckle interferometric technique for measuring the 3D displacement vector field and the in-plane strain components of a deformed object is presented. The displacement components at each point on the surface of the object are calculated by subtracting the measured phases before and after deformation. Accurate phase measurement in each detector point is achieved by using reference beam phase shifting, fast digitizing of the interference patterns and image processing techniques. The 3D displacement vector can be calculated from measurements of the displacement components along four sensitivity vectors. Application of a special gradient filter enables the determination of the in-plane strain components. Special purpose hardware allows a complete measurement of the phase change modulo 2n on a 512*512 grid every 240 ms. The measuring system and its performance will be discussed and results of measurements of the in-plane strain components in a simple experimental aluminium object are shown. For small loads the estimated inaccuracy amounts to 0.3 listrain r.m.s..

Citation Download Citation

A. A.M. Maas and H. A. Vrooman "In-Plane Strain Measurement By Digital Phase Shifting Speckle Interferometry", Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990); https://doi.org/10.1117/12.962751

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