Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-12-02
1993-01-19
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324232, 32420726, G01B 714
Patent
active
051809788
ABSTRACT:
A proximity sensor is provided with a means for directly measuring parameters of a proximity sensor coil which permit the determination of both the AC and DC resistances of the coil. These parameters are then used to determine a discriminator value magnitude according to a mathematical relationship that has been predetermined through previous analysis of empirical data for the particular coil and application intended for the proximity sensor. In one particular application of the present invention, the rear AC resistance is utilized and is added to the DC resistance after the DC resistance has been mathematically altered by a preselected factor. Alternative embodiments of the present invention can also utilize the imaginary AC component of the impedance either by itself or in conjunction with the rear AC component of the impedance. Whether the real or imaginary AC components of the impedance are used individually or together, the DC resistance is used in the determination of the discriminator value magnitude because of its reliable relationship to the temperature of the coil.
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Bjork Paul E.
Demma Nick A.
Gesin Milford M.
Postma Stephen J.
Wagener Thomas J.
Edmonds W. S.
Honeywell Inc.
Lanyi William D.
Strecker Gerard R.
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