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Optical Engineering

Generation Of Moire Contours With Acousto Optic Cells
Author(s): Joel H. Blatt; Huey-Chin Cheng Ho; Eddie H. Young
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Paper Abstract

Moire contours are seen on a curved surface viewed through a grating when the surface is illuminated 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 (AO) 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 when the illuminating laser beam is strobed with 50 ns pulses by means of an AO modulator. We give data showing the variation in grating spacing with AO modulation frequency. Figures show 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 with those in the literature.

Paper Details

Date Published: 1 September 1989
PDF: 3 pages
Opt. Eng. 28(9) 289996 doi: 10.1117/12.7977076
Published in: Optical Engineering Volume 28, Issue 9
Show Author Affiliations
Joel H. Blatt, Florida Institute of Technology (United States)
Huey-Chin Cheng Ho, Florida Institute of Technoloav (United States)
Eddie H. Young, Newport Electro-Optics Systems (United States)


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