Device for measuring the lubrication of surfaces rolling or slid

Details Device for measuring the lubrication of surfaces rolling or slid Device for measuring the lubrication of surfaces rolling or slid

1980-06-25

1982-08-17

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2726

Patent

active

043452035

ABSTRACT:
A device for measuring the lubrication of surfaces which roll or slide relative to one another and are lubricated by a lubricant. The device includes an oscillator generating an AC voltage signal whereby the capacitance between the lubricated surface is measured by first grounding the capacitance and then connecting it by way of a condenser to the output of an oscillator. This output is connected further to a first input of a modulating circuit while the voltage occurring across the capacitance is delivered to a second input of the demodulating circuit. The output of the demodulating circuit is connected to a processing unit which derives a signal corresponding to the thickness of the lubricant film as well as the percentage contact time during a certain interval of measurement from the output signal of the demodulating circuit.

REFERENCES:
patent: 3182255 (1965-05-01), Hopkins et al.
patent: 3331019 (1967-07-01), Irwin

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