Many years ago I saw a product anouncement for a flow meter that used optical sensors. I don't remember the name of the company and I have no idea if they are still around. I've thought about this many times since I got into water cooling since I don't like most of the intrusive methods used to measure flow rate. Using optical mouse sensors is an interesting idea. Getting the needed data out of the optical sensor may not be easy since it would require reverse engineering the communications prototcol and outputed "mouse movement" information so it could be turned into flow rate information.
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