Version 1.0, August 31, 2001, Copyright, Hugh Jack 1993-2001
· These devices measure the angular velocity of a rotating shaft.
· One way is to connect a DC generator (motor). The faster the shaft turns, the higher the voltage.
· Another technique uses a magnet with a pickup coil. As the magnet passes the coil a pulse is generated. The pulse magnitude and frequency are proportional to speed.