Ferraris sensor

Details Ferraris sensor Ferraris sensor

2006-08-01

2006-08-01

Williams, Hezron (Department: 2856)

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

Reexamination Certificate

active

07082829

ABSTRACT:
A Ferraris sensor for measuring an acceleration of a moving body along a direction. The sensor includes a flat eddy current body and a scanning head arranged on one side of the eddy current body. The scanning head includes N magnets that generate an external magnetic field that extends approximately perpendicular to a surface of the eddy current body, wherein N=1, 2, 3, . . . and M detector coils, wherein M=1, 2, 3, 4, . . . and each detector coil includes an axis and detects changes of an interior magnetic field within the N magnets that are caused by an acceleration of the eddy current body and a resulting change in eddy currents. The axis is approximately perpendicular with respect to the surface of the eddy current body, each detector coil lacks a ferromagnetic core and the N magnets and the M detector coils are arranged alternatingly next to each other in a direction that the acceleration is to be measured.

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Roger Allan, “Coil-Based Micromachined Sensor Measures Speed and Position for Automotive Applications,” Electronic Design, Dec. 16, 1996, pp. 34, 35, 37.

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