Hi Gareth,

Can you monitor the fringe intensity at two adjacent locations
(closer than the narrowest fringe encountered)? You could then
compare the phase of the two signals.

David Whalley

>Hello,
>I'm using an interferometry technique as a method of measuring
>a flat section. The problem is that as well as using a fringe counter
>mechanism to tell me how many fringe movements have occurred and thus
>the height variations on the section. I also need to know which way
>the fringes have moved to tell me whether the section is increasing
>in height or decreasing in height. The first part of the problem was
>simple to solve and so i can happily count the fringe movements and
>relate them to the areas of the section. However I do not know any
>hardware or software which can define clearly whether the fringes are
>moving left or right.
>
>Can you help?
>
>Thanks very much
>
>Gareth Jones
>Email: [log in to unmask]
>
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