Patent ID: 6779409
Filing Date: 2004-08-24
Classification: G01L

Abstract:
A device for measuring transient torque in a rotating shaft, said rotating shaft comprising ferromagnetic material wherein said transient torque generates a magnetic flux change, said device comprising:(a) a magnetostrictive sensor positioned in spaced proximity to said rotating shaft, said sensor comprising: (1) a detection coil surrounding said rotating shaft and having therein an induced voltage signal indicative of a magnetic flux change; (2) a permanent DC bias magnet, said magnet establishing a baseline static magnetic field within said ferromagnetic material; (b) a signal conditioner for receiving, amplifying and filtering said induced voltage signal from said magnetostrictive sensor thereby conditioning said induced voltage signal; and (c) a signal analyzer for receiving and analyzing said conditioned induced voltage signal and determining therefrom a quantitative value for said transient torque.