> 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 ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users