Speckle displacement for general object deformaton of a curved surface

• Autores: I. Yamaguchi
• Localización: SPECKLE 2012: V International Conference on Speckle Metrology : 10-12 september 2012 : Vigo, Spain / Ángel Manuel Fernández Doval (ed. lit.), María Cristina Trillo Yáñez (ed. lit.), José Carlos López Vázquez (ed. lit.), 2012, ISBN 9780819490902
• Idioma: inglés
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• Resumen

  • Displacement of speckles arising from a curved surface subject to displacement or deformation is investigated by numerical simulations using a rough surface model that is represented by an assembly of point scatterers distributed around its mean surface. Speckle displacement in the diffraction field of an object illuminated by a narrow laser beam is derived from the peak position of the cross-correlation function between the 2-dimensional intensity signals recorded by a CCD before and after object deformation or displacement. The evaluated speckle displacement is compared with with those obtained from analytical approach for a flat mean surface. It has been shown that they agree well with each other. Then speckle displacement from a spherical surface is evaluated to indicate some differences in displacement sensitivities from a plane. This simulation can be applied to surface shape and roughness, and recording specifications