Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1976-11-02
1979-08-14
Woodiel, Donald O.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
G01F 2326
Patent
active
041641469
ABSTRACT:
An inductive level sensor has inductively coupled primary and secondary windings. Circuitry drives the primary with an AC signal of constant current magnitude and selected frequency f to induce in the secondary, a voltage signal V of magnitude .vertline.V.vertline., frequency f and phase difference .phi. from the driving signal. Circuitry operates to generate a voltage output signal proportional to .vertline.V.vertline. cos (.phi.-.theta.), where .theta. is a selectively set phase shift factor. By properly and selectively adjusting the frequency f and phase shift factor .theta., an output signal .vertline.V.vertline. cos (.phi.-.theta.) can be provided which self-compensates for changes in mutual inductance caused by operating temperature variations so that an output signal is produced which is substantially linearly proportional to changes in the level of a pool of liquid metal being monitored. Disclosed also is calibration circuitry and circuitry for converting the voltage signal .vertline.V.vertline. cos (.phi.-.theta.) into a current signal.
REFERENCES:
patent: 3402607 (1968-09-01), Cambillard et al.
patent: 3722281 (1973-03-01), Marsh
DuVall Bruce W.
Morey Kenneth O.
Valentine James W.
Carlson Dean E.
Erdley R. G.
The United States of America as represented by the United States
Woodiel Donald O.
Wymore Max L.
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