Absolute digital position measurement system

Details Absolute digital position measurement system Absolute digital position measurement system

1977-02-28

1978-03-21

Swisher, S. Clement

Measuring and testing

Liquid level or depth gauge

Float

G01F 2312

Patent

active

040796272

ABSTRACT:
A liquid level measurement system including a vertical linear member and a float. The linear member includes a plurality of electrical conductors, each representing one bit of a multiple bit Gray code and each including alternate portions which interact with the float to produce a signal in the conductor indicative of a logical "1" or "0". The "1" portions and the "0" of the conductors form a unique binary code word at each position of the float. 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 float. An inductor extending the length of the linear member powers the system, without electrical leads to the float.

REFERENCES:
patent: 2569106 (1951-09-01), James et al.
patent: 3124795 (1964-03-01), Zardi
patent: 3308665 (1967-03-01), Williams et al.
patent: 3343415 (1967-09-01), Johnston
patent: 3675235 (1972-07-01), Wayman
patent: 3819857 (1974-06-01), Inokuchi
patent: 4007636 (1977-02-01), Wahl
Kurbatov, "Souviet Journal of Instrumentation and Control", No. 8, Aug. 1969, pp. 23-25.

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