Ned Simmons wrote in
news

But in any case, watch out for the response time of the sensor. The
hole (or flag) needs to be large enough to give the sensor time to
trigger. If something faster than the packaged sensors above is
required, bare emitter/sensor pairs are available that are at least a
couple orders of magnitude faster. Of course, you then need to build
your own signal conditioning, but that's not very difficult.


The Q45 series from Banner with opposed fibers have a 2 ms response time.
That should be plenty fast enough for just about any application.

--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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