We present a novel optical configuration that yields a fringe pattern that represents the slope changes of a three-dimensional object with a twofold increase in sensitivity. The method offers controllable sensitivity over a wide range. We accomplish it by modifying the in-plane displacement sensitive configuration of speckle interferometry. The detailed theory and the experimental results are presented with a brief discussion on the limiting aspects of the configuration.
© 1998 Optical Society of America
T. Santhanakrishnan, P. K. Palanisamy, and R. S. Sirohi, "Optical Configuration in Speckle Shear Interferometry for Slope Change Contouring with a Twofold Increase in Sensitivity," Appl. Opt. 37, 3447-3449 (1998)