초록 ▼

There are disclosed an improved method of and apparatus for use in monitoring or controlling the positional relationship of two relatively movable members. A leading and a trailing magnetic sensing probe are coupled to one of the members. Each probe is fixedly spaced relative to the other probe, and

There are disclosed an improved method of and apparatus for use in monitoring or controlling the positional relationship of two relatively movable members. A leading and a trailing 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 movement. The control means compares the stored value with the present 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.

대표청구항 ▼

Apparatus for monitoring the relative displacement between a pair of members, one of which is moved along a given path, said apparatus comprising: sensing means operatively connected to a first of said members for sensing magnetic field strength, said sensing means including at least a pair of magne

Apparatus for monitoring the relative displacement between a pair of members, one of which is moved along a given path, said apparatus comprising: sensing means operatively connected to a first of said members for sensing magnetic field strength, said sensing means including at least a pair of magnetic sensing probes spaced apart an incremental distance from each other; magnetic means operatively connected to the second of said members for providing a magnetic field wherein the magnetic field strength thereof varies as a function of distance along a sensing path, said magnetic means and said sensing means being configured and arranged such that during the relative displacement, said sensing means moves along the sensing path of varying magnetic field strength; and, control means operatively coupled to said probes and being operable for determining the value of the field strength sensed by each of said probes and for storing a value related to the sensed value of a leading one of said probes, as viewed in the direction of the relative displacement, and for comparing the stored value with a present value of the other of said probes so as to define the relative distance traversed during the relative displacement of said members as a function of the incremental distance of said probes and the relationship of the stored and present values.