Publication: Fringe Formation in Symmetric Three-aperture Speckle Shear Interferometry: An Analysis
Date
01-01-1997
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Abstract
Multi-aperture speckle shear interferometry also exhibits sensitivity to the in-plane displacement component. The interferogram obtained even at normal illumination contains fringes due to the combined contributions of slope, strain and in-plane components. The fringe pattern, therefore, changes when the shear element is placed at different aperture positions for the same experimental conditions. We have examined a three-aperture symmetric configuration where the shear element is either placed at the peripheral aperture or at the central aperture. The experimental results are presented. Copyright © 1996 Elsevier Science Ltd.