Capacitance displacement type measuring probe

Details Capacitance displacement type measuring probe Capacitance displacement type measuring probe

1976-01-14

1977-02-15

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73 70, 318490, 361280, G01R 2726

Patent

active

040084337

ABSTRACT:
A capacitance displacement type measuring probe for measuring the vibration of a dynamoelectric machine including a dynamoelectric machine with helical grooves in its collector ring is disclosed. The probe measures the vibration of the dynamoelectric machine by measuring the change in capacitance of a capacitor established by the probe and the collector ring. The probe has a parallelogram sensing face which includes a sensing electrode having a parallelogrammed sensing surface whose axial length is of a predetermined dimension to coact with the parameters of the collector ring. The axial length of the sensing surface is formed such that the sensing surface scans a constant total high and total low area on the collector as the collector rotates. To measure vibration the probe is deployed at a fixed point in space with its parallelogrammed sensing face in parallel with the longitudinal axis of the rotating member to form a capacitor. The capacitor thus formed is placed in series with a resistor and series circuit is driven by an alternating current signal generator. Change in capacitance results in change of voltage across the capacitor to develop a signal related to vibration of the collector.

REFERENCES:
patent: 2435880 (1948-02-01), Eilenberger
patent: 3031617 (1962-04-01), Paquette
patent: 3879644 (1975-04-01), Maltby

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