Saturable core proximity sensor including a flux director

Details Saturable core proximity sensor including a flux director Saturable core proximity sensor including a flux director

G - Physics

01

P

G01P 3/48 (2006.01) G01N 27/72 (2006.01) G01V 3/08 (2006.01)

Patent

CA 2080656

A variable reluctance saturable core proximity sensor assembly comprising a target (22) and a sensor (50). The target consists of a magnet (24) having a high field strength, a base plate (28) having a high relative permeability, and a nonmagnetic metal housing (34, 36) surrounding the magnet and base plate. The sensor consists of a core (52) made from a material having a high relative permeability, a coil (60) surrounding the core and a housing made from a nonmagnetic material surrounding the core and coil. At its distal end of the core is a flux director (120) that intercepts the magnetic field produced by the target. The flux director comprises a plurality of radially extending arms having the same permeability as the core. The flux director has a cross-sectional area selected so that the flux director and core saturate at substantially the same time. The sensor assembly may be used in either a slide- by or head-on mode.

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