> Happy to see some pic of  your's prototype !
> I have ever made an prototype interferometer to do measurement
> of distance. And I have some difficult to have a good signal on photodiode to
> have stable measurement.

one picture and some text is now here.
http://www.anderswallin.net/2009/12/michelson-interferometer/
I hope to analyze the data and post a result picture later when I have time.

> For that i know I think to know in which direction you are going you must
> detect the front side or down side of interference with two photodiode reading
> the same interference but  with an difference of  period T/4 in long !
> Looks like absolute encoders !

Yes. You need two signals in quadrature. But how is this typically
achieved in a commercial instrument? These things must be very
robustly built if they are used in an industrial setting!


AW

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