Hello,

I'm trying to build an underwater tachometer for an AUV (autonomous =
underwater vehicle) being built at the University of Victoria by a group =
of engineering students.  What we hope to do is the standard shaft =
encoder scheme where one determines speed by counter the number of =
strips that pass by a photoreflector for a given time period.  As such, =
we are looking for an IR photoreflector that is contained in a =
waterproof casing (maximum depth we will be going is 30 feet).  Can =
anyone recommend such a photoreflector or an alternative way to match =
the speed of two motors?

Regards,
Donovan

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