On Dec 18, 2009, at 11:14 AM, Anders Wallin wrote: > Hi all, > > I built a simple interferometer for measuring the surface of a hand > ground/polished telescope mirror a while ago. > > Yesterday I removed the expanding lens and used a photodiode to > measure the interference fringes. I mounted the back-reflector on a > small motorized stage which has ca 100mm of movement range. It worked > OKish and I will post a pic and some results soon. With this simple > setup there is only one sine-shaped signal so I don't know which > direction the stage moves when I see fringes. >
I did this once with a mach-zehnder interferometer. I also use a photodiode to count fringes, but I can't recall how I measured which way the fringes moved. I'll try to find the report about it. The setup was very simple, I only wanted an indication about the stability of the interferometer itself and the influence of temperature differences in the lab. Dirk ------------------------------------------------------------------------------ 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
