title: Visual speckle technique for alignment and centering of a translucent rough surface.
abstract: A simple visual method is described which is based on the direct analysis of speckle pattern movement. It permits aligning a transparent diffuser, placing its rotation axis on the mean plane of the rough surface and simultaneously determining the optical axis. As a consequence, the direction of the illuminating light beam can be determined.
authors.forename: E N
authors.initials: EN
authors.lastname: Hogert
authors.forename: J J
authors.initials: JJ
authors.lastname: Lunazzi
authors.forename: N G
authors.initials: NG
authors.lastname: Gaggioli