Passive fiber optic rotary encoders do exist and have many benefits. Unfortunately, low cost is not among them. See:
http://www.micronor.com/products.php?category=Fiber%20Optic%20Rotary%20Encod ers&offset=0 > -----Original Message----- > From: Sven Wesley [mailto:svenne.d...@gmail.com] > Sent: Sunday, October 11, 2009 3:32 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Encoders > > 2009/10/11 Gene Heskett <gene.hesk...@gmail.com> > > > [Gene gives a lesson] > > > > Sometimes I wonder if I shouldn't take all these mail and > make a book out of them. :) > > But the whole discussion makes me think of another idea I had > one time. Why aren't we using optical wires? > They are cheap (cheaper than copper cables), can be extremely > long and they'll never pickup noise, and on top of that the > encoder can be passive. > One fibre for light feed to the encoder, the encoder only > consists of a fibre splitter and an optical wheel. Three > fibres return A/B/Index channels and all the logic can be > inside the driver. > > > --S > -------------------------------------------------------------- > ---------------- > Come build with us! The BlackBerry(R) Developer Conference in > SF, CA is the only developer event you need to attend this > year. Jumpstart your developing skills, take BlackBerry > mobile applications to market and stay ahead of the curve. > Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
