title: Method for fringe enhancement in holographic interferometry for measurement of in-plane displacements.
abstract: 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.
authors.forename: T E
authors.initials: TE
authors.lastname: Carlsson
authors.forename: J
authors.initials: J
authors.lastname: Gustafsson
authors.forename: N H
authors.initials: NH
authors.lastname: Abramson