SHEARING MEASUREMENTS WITH TWO SHEAR DIRECTIONS

T. Siebert, B. Schmitz

Abstract

Shearography is a full field interferometric technique for the measurement of small deformation gradients. The main applications are non-destructive testing in material inspection and quality control. This contribution intends to present a new image shearing speckle pattern interferometer set-up for simultaneous measurement of two independent deformation gradients equivalent to two shear directions. Herein, we use the polarization effect to separate the two directions. The selection of the polarized images, which correspond to the shear direction, has been performed either by a polarization beamsplitter (PBS) or a rotatable polarizator. The utility of this new concept has been demonstrated by several measurements on a tensile testing machine.

Keywords

speckle interferometry, non destructive testing, polarization

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IMEKO-WC-2000-TC2-P054.pdf

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IMEKO TC

TC2 - Photonics

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