Automatic Analysis Of Holographic And Shearographic Fringes To Measure Flexural Strains In Plates

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Abstract
The technique of phase measuring by spatially modulated carrier fringes is applied to analyzing holographic and shearographic fringes. The algorithm employed is a simplified version of the Fourier transform method and does not require any special device such as the frequency modulator used in time domain phase detection techniques. Analyzed phase data are numerically differentiated to calculate full-field distributions of flexural curvature and twist, which correspond to flexural strains.

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