Is the moire effect light interference or shadow superposition?

[loke137]

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

 

[ceptimus]

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.

 

[loke137]

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.