Question about the Moire Effect

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The Moire effect results from the superposition of patterns, which can be attributed to both light interference and shadow effects, depending on the scale of the objects involved. Large-scale examples, such as rows of trees or bridge railings, primarily demonstrate shadow effects rather than interference. However, as the spacing of the patterns decreases to the scale of light wavelengths, interference becomes more significant. To predict the Moire pattern, understanding the geometry and spacing of the overlaid grades is essential. Resources like "The Theory of the Moire Phenomenon" by Isaac Amidror can provide further insights into this phenomenon.
loke137
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Hello,

I am studying the Moire effect and I have a question about it: the appearance of fringes because of the superpostion of two grades is the effect of light interferance or simple the superpostion of shadows?
And does anyone know how can I go about to determine what will be the pattern given to grades? Thank you

loke137
 
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You can see the moire effect even with very large scale objects, such as two rows of regularly spaced trees, one behind the other, or railings on a bridge, so I don't think it is just an interference effect. On these large scale objects it is a shadow effect. Interference may come into play as the spacing of the gaps becomes smaller - approaching a few wavelengths of the radiation the moire effect is being observed with.
 
Thank you very much. Just for reference to whoever is looking at this thread, I found a nice book on this topic: The Theory of the Moire Phenomenon, by Isaac Amidror.
 

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