Linear ECL distance measuring gauge

Details Linear ECL distance measuring gauge Linear ECL distance measuring gauge

1974-10-24

1976-12-28

Segal, Robert

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 34PS, 331183, G01R 3312

Patent

active

040004597

ABSTRACT:
A linear eddy current loss (ECL) proximity distance measuring gauge comprising an ECL oscillator and a linearizing DC feedback circuit is disclosed. As the distance between a magnetic target and the ECL coil increases and changes the impedance of the ECL tuned circuit, the linearizing DC feedback circuit shunts current away from the tuned circuit and controls the rate at which oscillation amplitude varies with a change in target distance. The amplitude control created by the linearizing DC feedback circuit results in oscillation amplitude being linearly related to the distance between the target and the ECL coil. A peak detector circuit detects oscillation amplitude and applies a directly related DC voltage to a buffering emitter follower output circuit. Thus, output voltage is linearly related to target distance.

REFERENCES:
patent: 3883796 (1975-05-01), Holt et al.

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