A technique is presented to determine surface contours of 3-D objects by laser speckle interferometry. A double exposure specklegram is recorded by giving the object a small tilt between exposures. Surface contours are obtained by Fourier filtering of the specklegram.
© 1981 Optical Society of America
G. K. Jaisingh and F. P. Chiang, "Contouring by laser speckle," Appl. Opt. 20, 3385-3387 (1981)