Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1990-12-28
1991-10-01
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324725, 324660, 34087037, G01R 2726, G08C 1916
Patent
active
050537156
ABSTRACT:
Capacitive-type measuring apparatus for making absolute measurements comprises first and second support members which are relatively displaceable with respect to a measurement axis; an array of first electrodes disposed on the first support member; an array of second electrodes disposed on the second support member such that differing portions of the second electrode array are capacitively coupled with the first electrode array in dependence on the relative positions of the support members; an array of third electrodes disposed on the second support member so as to be electrically connected to corresponding second electrodes and spatially offset therfrom by an amount which varies according to the position of the third electrodes from a reference position; and a fourth electrode arrangement disposed on the first support member for providing in combination with the other arrays a plurality of discrete signal transmission paths each having a capacitive transfer function with two components, one of which varies according to a predetermined function over a first wavelength, and the other of which varies according to a predetermined function over a second wavelength shorter than the first. The fourth electrode arrangement permits selective spatial filtering of the two components, thereby permitting different resolution measurements to be made with the same electrode arrays, which measurements can be combined to obtain high accuracy absolute position measurements over an extended measuring range.
REFERENCES:
patent: 4429307 (1984-01-01), Fortescue
patent: 4743838 (1988-05-01), Eckerle
patent: 4743902 (1988-05-01), Andermo
patent: 4878013 (1989-10-01), Andermo
patent: 4879508 (1989-11-01), Andermo
patent: 4882536 (1989-11-01), Meyer
Mitutoyo Corporation
Mueller Robert W.
Wieder Kenneth A.
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