Microdisplacement detector

Details Microdisplacement detector Microdisplacement detector

1981-11-10

1984-03-27

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, 324 61QS, G01R 2726

Patent

active

044397259

ABSTRACT:
In a microdisplacement detector adapted to obtain a frequency signal corresponding to a microdisplacement of a feeler from two frequency signals which are provided by a movable electrode connected to the feeler and a pair of stationary electrodes disposed on both sides of the movable electrode, auxiliary stationary electrodes are provided for the aforementioned stationary electrodes so as to correct the capacitance variation characteristics of the differential capacitors which are formed by the stationary electrodes and the movable electrode, thereby to increase the range of measurement.

REFERENCES:
patent: 2718619 (1955-09-01), Whittier
patent: 2918818 (1959-12-01), Meyer
patent: 3031617 (1962-04-01), Paquette
patent: 3177427 (1965-04-01), Kuntz et al.
patent: 3312892 (1967-04-01), Parnes
patent: 3321699 (1967-05-01), Rademakers
patent: 3702957 (1972-11-01), Wolfendale
patent: 3860918 (1975-01-01), Cencel
patent: 4310806 (1982-01-01), Ogasawara
Brennemann, Linear Variable Capacitor Encoder, IBM Technical Disclosure Bulletin, Jan. 1980, pp. 3531, 3532.

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