Application of acousto-optic cells and video processing to achieve     signal-to-noise improvements in variable resolution moire profilometry

Joel H. Blatt; Jeffery A. Hooker; Huey C. Ho; Eddie H. Young

doi:10.1117/12.58878

1 October 1992 Application of acousto-optic cells and video processing to achieve signal-to-noise improvements in variable resolution moiré profilometry

Joel H. Blatt, Jeffery A. Hooker, Huey C. Ho, Eddie H. Young

Author Affiliations +

Optical Engineering, Vol. 31, Issue 10, (October 1992). https://doi.org/10.1117/12.58878

Abstract

Moiré techniques can be a powerful tool to determine surface shape or deviation of a shape in progress from a final or desired shape. The presence of the high-contrast viewing grating and the distorted grating in the final image plane makes the moiré pattern hard to see. Moving grating techniques have been developed to improve the visibility of the moiré pattern, but at the expense of complex moving parts. Several variable resolution projection moiré techniques have been developed that either move the grating or eliminate its presence electronically, and have neither mechanical moving parts nor any physical gratings. One system uses an acousto-optics cell to generate, project, and move the gratings, while the moiré is viewed through a second synchronized A-O cell. The second system uses an interferometer to generate and project variable spacing gratings that are made to move across the target and across a reference surface by an A-O beam deflector. Video processing of the reference image generates the transmissive filter that produces the moiré pattern. A third system removes the grating presence electronically but retains high-contrast moiré contours. Noise reduction is shown in a series of moiré images of targets.

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Joel H. Blatt, Jeffery A. Hooker, Huey C. Ho, and Eddie H. Young "Application of acousto-optic cells and video processing to achieve signal-to-noise improvements in variable resolution moiré profilometry," Optical Engineering 31(10), (1 October 1992). https://doi.org/10.1117/12.58878

Published: 1 October 1992

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