Magnetic sensing for monitors and controllers

Details Magnetic sensing for monitors and controllers Magnetic sensing for monitors and controllers

G - Physics

05

D

341/106, 340/135

G05D 3/20 (2006.01) G03B 9/08 (2006.01) H02K 33/18 (2006.01)

Patent

CA 1203602

IMPROVED MAGNETIC SENSING FOR MONITORS AND CONTROLLERS ABSTRACT OF THE DISCLOSURE There are disclosed an improved method of and appara- tus for use in monitoring or controlling the positional relation- ship of two relatively movable members. A leading and a trail- ing magnetic sensing probe are coupled to one of the members. Each probe is fixedly spaced relative to the other probe, and both are arranged so as to cut a magnetic field along a path of varying field strength generated by magnetic means on the other member. Control means are provided for periodically determining the values of the field strength measured by each of the probes and storing a value related to the measured value of a leading one of the probes as viewed in the direction of relative move- ment. The control means compares the stored value with the pre- sent value of the lagging probe so as to define the relative movement in accordance with the incremental separation of the probes and the relationship of the stored and present values.

443519

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