Electricity: measuring and testing – Magnetic – Displacement
Patent
1982-07-15
1986-07-29
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324233, 324234, 324243, 34087032, G01B 714, G01N 2772, G01R 3302, G08C 2100
Patent
active
046032959
ABSTRACT:
A magnetic proximity sensor for detecting the proximity of a laterally mog magnetized target moving along a translation axis which is parallel to a line joining the targets magnetic poles, including: two ring-core flux-gate magnetometers disposed adjacent to each other with their axes of sensitivity in parallel, with both axes perpendicular to the magnetized target translation axis. The energizing coils of the flux-gate magnetometers are driven by an ac signal at frequency f.sub.o. The signal on the detecting coils in each flux-gate magnetometer is applied to a phase comparator via a bandpass filter tuned to the second harmonic of f.sub.o. When the signals applied to the phase comparator are of opposite phase, then the center plane equidistant from the target's magnetic poles is between the two axes of sensitivity of the magnetometers. When the signals are of the same phase, then the target's center plane is laterally outside of the these two axes.
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Beers Robert F.
Edmonds Warren S.
Ellis William T.
Sheinbein Sol
Strecker Gerard R.
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