Patent ID: 6559632
Filing Date: 2003-05-06
Classification: G01P

Abstract:
An apparatus for determining linear and angular velocity of a moving body having a magnet attached thereto comprising:a core of magnetic material; a coil wound about the core, the movement of the body and magnet relative to the core effecting a time-varying magnetic field between the magnet and the core thereby producing Barkhausen effect time varying voltage signals in the coil; a filter for filtering extraneous noise signals from the Barkhausen effect time-varying voltage signals; an amplifier for amplifying the filtered signals; and an analog-to-digital converter for converting the amplified, filtered signals into digital signals; a processor circuit configured to transform the digital signals into data that defines the velocity of the moving body; a display for displaying the data; correction circuitry for producing an error signal that represents the difference between the velocity of the moving-body as defined by the data and a predetermined velocity; and control circuitry for adjusting or maintaining the velocity of the moving boy in accordance with the error signal.