Hi Warren,

My suggestion was to meaure the relative phase of the intensity variations,
not the actual phase of the light, i.e. if the intensity at point a increases
/decreases before point b then the fringes must be reaching point a first.

David Whalley

At 09:14 PM 2/4/99 -0500, Dr. Warren Smith wrote:

>Perhaps you can place a small force (in a known direction) on the sample as
>you observe the way the fringes shift. This will easily tell you the
>direction of the height variation (probably a much simpler method than
>trying to compare the phases of reflected light -- especially because
>anything  you try to do to compare the phases would require a measurement
>way outside of the coherence length of a reflection!)

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