The influence of displacement and its first- and second-order derivative components on curvature fringe formations in speckle shearography is discussed. The results show that (a) all the displacement components have no direct influence on curvature fringe formations; (b) only the first-order derivative component along the centerline of three apertures has an influence on curvature fringe formations, whereas all the other first-order components have no influence; and (c) all the second-order derivative components have no influence on curvature fringe formations. Results from theory and experiments are in good agreement.
© 2002 Optical Society of America
(030.6140) Coherence and statistical optics : Speckle
(070.6110) Fourier optics and signal processing : Spatial filtering
(120.3180) Instrumentation, measurement, and metrology : Interferometry
Kaifu Wang, Anh Kiet Tieu, and Enbang Li, "Influence of Displacement and its First- and Second-Order Derivative Components on Curvature Fringe Formations in Speckle Shearography," Appl. Opt. 41, 4557-4561 (2002)