Capacitive type measurement transducer with improved electrode arrangement
US4878013A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1988 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | May 31, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2415
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitive type measuring apparatus comprises first and second electrode arrays mounted on first and second support members which are relatively displaceable with respect to each other. The first electrode array comprises a series of discrete first electrodes uniformly spaced with a pitch P.sub.r defining a scale wavelength and the second electrode array comprises a series of discrete second electrodes arranged so as to define a plurality of electrode groups each having N electrodes, where N is an integer greater than 2. The second electrodes forming each of the electrode groups are positioned within the respective groups so as to respectively occupy predetermined group positions which are distributed over a distance spanning more than one scale wavelength such that each of the group positions corresponds to the relation position of a different one of a set of relative scale wavelength segment positions obtained by dividing the group into intervals corresponding to the scale wavelength, and dividing each interval into N equal segments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.