> I need to "see" a steel setscrew (grubscrew) in a fiber wheel as the wheel
> rotates at varying RPM from 1000 RPM to 60000 RPM.  I'm only interested in
> determining instantaneous RPM, not in position data.
>
> Does anybody know of products which work in this situation?

I worked with a company a few years ago that was making a totally new sensor
for this kind of purpose.  It detects changes in magnetic field similarly to
a coil, but is much cheaper to produce than a coil.  They were making
versions with permanent magnets in them so that the thing being sensed
didn't have to be magnetized.

I helped them with two point products using their sensors, a tachometer and
a fluid flow meter.  These used a 16C923.  The CCP module measured the
period between pulses, and the '923 drove an LCD display directly to display
the result.

The company has meanwhile moved to California.  At the time is was called
Spinix, www.spinix.com.  Don't know what may have happened to them in the
last two years.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body