Method and apparatus for measuring distance

Details Method and apparatus for measuring distance Method and apparatus for measuring distance

1974-11-07

1976-12-14

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 34TK, G01R 3300

Patent

active

039978354

ABSTRACT:
In measuring the distance between a measuring sensor and a metallic body, the sensor is comprised by a resonance circuit including a capacitor and a coil, and the sensor is connected to the input of a Q multiplier circuit which is impressed with an AC signal having a predetermined frequency. The non-linear distance-inductance characteristic of the coil is compensated for by adjusting the selectivity of the resonance circuit so that the amplifier included in the Q multiplier circuit produces a linear output. Such compensation is performed by adjusting the gain and/or the amount of positive feedback of the Q multiplier circuit.

REFERENCES:
patent: 2928043 (1960-03-01), Foerster
patent: 3867689 (1975-02-01), Mori et al.

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