Tor Olav Kristensen wrote:
> 
> So from the co-ordinates where the two sets of stripes cross,
> one can deduct information about how the material has
> moved/deformed in that region ?

Right, but I think usually the reulsting image is processed
in such a way that is is smoothed (blurred) so that no
individual lines appear but only bright and dark stripes
(i.e. the moiree is the only information that remains).

> This leads me to think about the nice coloured patterns
> that appear when one shines polarized light through stressed
> acrylic materials and then views this through a polarized filter.

It's a similar effect, both have to do with interference.

Markus

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