Electricity: measuring and testing – Magnetic – Displacement
Patent
1976-07-27
1978-07-11
Rolinec, Rudolph V.
Electricity: measuring and testing
Magnetic
Displacement
340196, 324200, G01R 3300
Patent
active
041004850
ABSTRACT:
A detector for measuring relative movement and/or displacement between two relatively movable members comprises a plurality of regularly shaped elements of magnetic material e.g. steel balls, periodically spaced along a path which is preferably linear, and a transducer which is movable relative to the elements in a direction parallel to said path. The transducer comprises a transmitter coil, or series of coils, disposed for producing a magnetic field parallel to said path, and at least two pick-up coils encasing the path and displaced along it. The pick-up coils sense the variation in the magnetic field due to the presence of the elements, so that the relative spacing of the pickup coils and the elements enable, on the production of the magnetic field, the generation by the pick-up coils of output signals denoting the relative movement between the members.
REFERENCES:
patent: 1103358 (1914-07-01), Hess
patent: 1797864 (1931-03-01), Harlandt
patent: 3018437 (1962-01-01), Dudley
patent: 3147574 (1964-09-01), La Pointe et al.
patent: 3242472 (1966-03-01), Anthony
patent: 3456132 (1969-07-01), Dechelotte
patent: 3488578 (1970-01-01), Stigmark
Rolinec Rudolph V.
The Newall Engineering Company Ltd.
Tokar Michael J.
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