Generation Of Moire Contours With Acousto-Optic Cells

Joel H. Blatt; Huey-Chin Chang Ho; Eddie H. Young

doi:10.1117/12.946944

22 August 1988 Generation Of Moire Contours With Acousto-Optic Cells

Joel H. Blatt, Huey-Chin Chang Ho, Eddie H. Young

Proceedings Volume 0936, Advances in Optical Information Processing III; (1988) https://doi.org/10.1117/12.946944
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

Moire contours are seen on a curved surface viewed through a grating when the surface is illumnated with a matched grating. We have been able to replace both the projection and viewing physical gratings with gratings of variable spacing generated in acousto-optic cells, and have been able to observe and record Moire contours. The gratings are generated by amplitude modulating 70 MHz AO cells with a 1 to 10 MHz square wave. The gratings become visible on the curved object by strobing the illuminating laser beam with 50 nsec pulses by means of an AO modulator. Data is given showing the variation in grating spacing with AO modulation frequency. Figures are presented showing the variation of the Moire contour spacing with the AO modulation frequency and with target contour. The results for an angled flat plate target are compared to those in the literature.

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Joel H. Blatt, Huey-Chin Chang Ho, and Eddie H. Young "Generation Of Moire Contours With Acousto-Optic Cells", Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); https://doi.org/10.1117/12.946944

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KEYWORDS

Acousto-optics

Moire patterns

Modulation

Adaptive optics

Spatial frequencies

Spherical lenses

Modulators

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