Theoretical background along with experimental results are given for a simple method for in-plane fringe enhancement in dual-beam illumination holographic interferometry. In this method, the fringes representing in-plane displacements arise as a moirépattern between two interferograms. To distinguish the in-plane displacement, a sequence of images is recorded while the reference mirror is continuously tilted at random. The in-plane fringes arethen found as the maximum contrast of the out-of-plane fringes in the image sequence. The resulting fringe quality is close to the quality of the out-of-plane fringes.
© 1998 Optical Society of America
Torgny E. Carlsson, Jonny Gustafsson, and Nils H. Abramson, "Method for Fringe Enhancement in Holographic Interferometry for Measurement of In-Plane Displacements," Appl. Opt. 37, 1845-1848 (1998)