Abstract
We report on a method that can be used to improve the result of multiwavelength contouring in the case of objects with rough surface. It is based on the combined evaluation of multiple measurements with varying direction of illumination. While the individual measurements share the same systematics with respect to the shape of the investigated object, the noise arising from speckle decorrelation fluctuates statistically and hence can be reduced by means of averaging. For the case of three illumination directions we show that weighted averaging of the measured phase distributions enhances the signal-to-noise ratio by approximately 3 dB.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
León Schweickhardt, Andreas Tausendfreund, Dirk Stöbener, and Andreas Fischer
Appl. Opt. 60(7) 1871-1880 (2021)
Maciej Szkulmowski, Iwona Gorczynska, Daniel Szlag, Marcin Sylwestrzak, Andrzej Kowalczyk, and Maciej Wojtkowski
Opt. Express 20(2) 1337-1359 (2012)
Bernhard Wiesner, Ondrej Hybl, and Gerd Häusler
Appl. Opt. 51(6) 751-757 (2012)