A capacitive sensing system for use with a power cutting tool of the type which has an exposed, moveable blade adjacent a work surface is disclosed. The sensing system drives an excitation voltage onto the exposed blade and monitors the current drawn from the blade, detects changes in the amplitude and...http://www.google.fr/patents/US7888826?utm_source=gb-gplus-shareBrevet US7888826 - Capacitive sensing system for power cutting tool
