Method and device for detecting displacement of valve rod moveme

Details Method and device for detecting displacement of valve rod moveme Method and device for detecting displacement of valve rod moveme

1996-01-11

1998-04-21

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420712, 324225, 3242072, 32420726, G01B 714, G01D 520

Patent

active

057421617

ABSTRACT:
A method and apparatus for detecting displacement of valve rod movement in electropneumatic position regulators, by generating a high-frequency electromagnetic alternating field by exciting a high-frequency oscillation within an LC oscillating circuit in an inductive sensor, damping the high-frequency oscillation as a function of displacement via an electrically conductive body moved along by the valve rod, demodulating the oscillator signal and feeding the demodulated signal to a microcomputer without amplification for evaluation of the displacement-dependent damping of the oscillation amplitude, measuring the temperature within the inductive sensor, correlating the temperature with the measured oscillation amplitude in the microcomputer, and determining a corrected displacement signal from the correlation.

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Pub., Howard C. Roberts, University of Illinois, Instruments, vol. 17, pp. 334-339, Jun. 1944.
Balluff Induktive Nahcrungs, Inductive Sensors, pp. 0.2.0-0.2.1 (date not available).

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