Absolute digital position measurement system

Details Absolute digital position measurement system Absolute digital position measurement system

1975-05-05

1977-03-22

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

336129, 336130, 340195, 324 34PS, G08C 904

Patent

active

040140156

ABSTRACT:
A linear position measurement system including a linear member and a relatively movable member. The linear member includes a plurality of serpentine electrical conductors, each representing one bit of a multiple bit Gray code. At any longitudinal position of the movable member, an inductor in the movable member induces oppositely phased signals in those conductors which lie along a first long edge of the linear member and in those which lie along an opposite edge. A phase comparator in a readout device attached to the conductors compares the signals from each conductor with a reference and constructs a unique address code word indicative of the position of the movable member. The inductor in the movable member is activated through a special circuit which is powered by inductive coupling with a coil carried by the linear member.

REFERENCES:
patent: 3124795 (1964-03-01), Zardi
patent: 3675235 (1972-07-01), Wayman
patent: 3819857 (1974-06-01), Inokuchi
Kurbatov "Soviet Journal of Instrumentation and Control," No. 8, Aug. 1969, pp. 22-25.

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