Electricity: measuring and testing – Magnetic – Displacement
Patent
1997-08-18
2000-01-04
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420724, G01B 714, G01B 702, G01D 520
Patent
active
060113898
ABSTRACT:
An inductive transducer system for use in high accuracy applications such as linear or rotary encoders, employs two members movable relative to each other. A first, active member induces eddy currents in a second, passive member that lacks a power source or electrical wires connected thereto. The first, active member contains both a transmitter for generating a magnetic field and a receiver for receiving the field. The receiver has a plurality of symmetric loops. Electronic circuitry coupled to the receiver evaluates the relative position between the two members as the passive member disrupts the magnetic field received by the receiver. The inductive transducer can be readily manufactured using known printed circuit board technology, and is substantially immune to contamination by particles, including ferromagnetic particles, oil, water and other fluids. A pulse-driven drive circuit allows the inductive transducer to consume little power, and thus allows the transducer to be readily incorporated into hand-held, battery-powered measurement tools.
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Andermo Nils Ingvar
Atherton Kim W.
Masreliez Karl
Mitutoyo Corporation
Snow Walter E.
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