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 moiré pattern 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 are then 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
Original Manuscript: March 3, 1997
Revised Manuscript: October 14, 1997
Published: April 1, 1998
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)