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From: email@example.com (Bill Sloman)
Subject: Re: linear optical encoder - reflective
Date: 17 Sep 2002 03:59:47 -0700
NNTP-Posting-Date: 17 Sep 2002 10:59:47 GMT
firstname.lastname@example.org wrote in message news:...
> hi all,
> i'm trying to build an optical encoder. i've done it many times before, but
> this one is giving me trouble....
> it needs to be reflective, and linear.
> that is, it's a straight steel rod with a series of black stripes on it
> (about 0.5mm spacing) that i want to use to detect linear displacement.
> i've been playing around with lenses and photodetectors and the guts of
> old optical mice, but it's just so fiddly and I cant make it work.
> I have some small cylindrical pieces of some clear acrylic stuff (about
> 3mm diameter) to use as cylindrical lenses, and some HLC2701 optical encoder
> detector modules, but I cant make it work.
> does anyone have any tips on this sort of thing? or some off the shelf
> parts that can do it directly?
There are quite a few other suppliers of optical linear sensors in the
market, but Heidenhain seemd to be the market leader when I last know
much about the subject.
All but one of the lathes at Cambridge Instruments used Heidenhain
reflective scales and optical sensors.
The one exception used a Sony system which had magnetic sensors
looking a rod magnetised with an alternating sequence of north and
south poles at very precise intervals.
The (shrouded) Heidenhain sensor assemblies had to be flushed with
compressed air from time to time. The Sony system was a fit and
Bill Sloman, Nijmegen
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