G - Physics – 01 – B
Patent
G - Physics
01
B
324/48, 73/69
G01B 7/14 (2006.01) G01B 7/02 (2006.01)
Patent
CA 1272244
ABSTRACT OF THE DISCLOSURE A method and apparatus for measuring the spacing between a pair of surfaces, at least one of which is of electrically conductive and/or ferro- magnetic material, so that the wear of one of the surfaces can be determined. A measuring transducer having a core with coils, and a reference transducer substantially identical to the measuring transducer, are the basic elements. The measuring transducer is mounted close to an opposing surface of conductive and/or ferromagnetic material with a gap between them, and the reference transducer is mounted with a constant gap spacing between it and a reference surface of the same material as the opposing surface. A current detector, and first and second sources of electrical current, are operatively connected to coils of the transducers so that by sensing the difference in ampere-turns of the coils of respective transducers, or the difference between the magnetic fields produced by coils of the respective transducers, or both, an indi- cation of the distance between the measuring transducer and the opposing surface is provided. The measuring transducer (or a plurality of them) is preferably mounted within a body (such as a ferromagnetic material body) having an outer surface so that it is spaced from that outer surface, and wear of that surface can be determined.
527858
Granberg Bertil
Lanne Bert Richard
Goudreau Gage Dubuc
Kvaerner Pulping Aktiebolag
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