Extension of the Coherent Gradient Sensor (CGS) to the Combined Measurement of In-Plane and Out-of-Plane Displacement Field Gradients |
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Authors: | M. Mello S. Hong A. J. Rosakis |
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Affiliation: | (1) Graduate Aeronautical Laboratories (GALCIT), California Institute of Technology, Pasadena, CA 91125, USA;(2) Sandia National Laboratories, P.O. Box 0969-MS 9042, Livermore, CA 94550, USA |
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Abstract: | The Coherent Gradient Sensor (CGS) is extended to the optical differentiation of specular, diffracted wave fronts leading to the combined measurement of in- and out-of-plane displacement field gradients. A derivation of the underlying optical interference principles is presented along with an analysis of the effective instrument sensitivity. In order to demonstrate the capabilities of the technique, experimental measurements of crack-tip deformation fields were conducted under various loading conditions corresponding to mode-I, mode-II, and mixed mode near-tip crack fields. The experimental procedures and results of these tests are presented as validation of the technique. |
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Keywords: | Coherent Gradient Sensor (CGS) Diffracted wave front shearing In-plane displacement field gradients Out-of-plane displacement field gradients Moiré Fine pitch grating Ronchi grating Phase shifting Phase map Crack tip deformation fields Mode I Mode II Mixed mode |
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