Abstract: In a motion detector according to the Ferraris principle, an excitation element applies an inhomogeneous time-dependent alternating magnetic field to an induction element. A motion of the induction element induces in the induction element an eddy current with a temporal characteristic that depends both on the velocity and the acceleration. A sensor element measures the temporal characteristic of the eddy current and supplies the temporal characteristic to a signal processing circuit which determines at least one useful signal that is proportional to the velocity and acceleration, respectively.

Abstract: In a motion detector according to the Ferraris principle, an excitation element applies an inhomogeneous time-dependent alternating magnetic field to an induction element. A motion of the induction element induces in the induction element an eddy current with a temporal characteristic that depends both on the velocity and the acceleration. A sensor element measures the temporal characteristic of the eddy current and supplies the temporal characteristic to a signal processing circuit which determines at least one useful signal that is proportional to the velocity and acceleration, respectively.

Abstract: A magnetic motion sensor, having a mobile magnet that generates an essentially homogeneous magnetic field with a magnetic-field direction, and having a coupling element which is stationary within the magnetic field, and wherein a motion-dependent physical quantity is induced in the coupling element when the magnet moves perpendicular to the magnetic-field direction, and the induced quantity is measured and output by a sampling element.

Abstract: A magnetic motion sensor, having a mobile magnet (3) that generates an essentially homogeneous magnetic field (B) with a magnetic-field direction, and having a coupling element (6, 6′) which is arranged stationary inside the magnetic field (B), a motion-dependent physical quantity (I, F, M) being induced in the coupling element (6, 6′) when the magnet (3) moves perpendicular to the magnetic-field direction, and the induced quantity (I, F, M) being measured and output by a sampling element (7, 8, 8′)