Patent ID: 6230104
Filing Date: 2001-05-08
Classification: G01F

Abstract:
An apparatus for use as a combined oscillatory signal pickoff device and vibrational driver, said apparatus comprising:a driver coil assembly having a first impedance including:a coil in said driver coil assembly capable of emanating field effects derived from oscillating voltage leading to said coil, and a magnet in said driver coil assembly;means for positioning said magnet in operable relationship with respect to said coil wherein said magnet is driven in oscillation with respect to said coil responsive to field effects emanating from said coil;a mimetic circuit determining a second impedance substantially similar to said first impedance when said magnet is stationary in fixed positional relationship with respect to said coil;means for applying a drive voltage signal to said coil and said mimetic circuit to produce a coil voltage and said mimetic circuit voltage; andmeans for calculating back electromotive force in said coil using voltage measurements obtained from at least one of said mimetic circuit and said drive coil assembly.