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Analysis performed with fixed images
and optical projection.
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Both numerical simulation and experimental
observations have been made.
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Image acquisition system set up.
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Analysis software developed.
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Image processing environment developed.
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Various image processing tools.
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Histogram, threshold, noise removal,
interference removal, grid removal, trace identification,
ridge detection, thinning, clustering.
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Expert system.
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Flexible, menu-driven development
tool.
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Fourier Transform technique, Moiré
technique and subpixel analysis techniques used to measure
deformations. Both numerical simulation and imaging
of simulated rotor blade analyzed.
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Two candidate techniques, Fourier
Transform and Moiré technique, found to provide
excellent resolutions, equivalent to about 0.01"
displacement over a 20’ span.
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Time sequence of rotating images
acquired and analyzed.
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Overall, demonstration of the measurement’s
precision as well as the concept measuring time sequence
images to obtain the modal information.
