Patent · US Expired

Process for the capacitive measurement of lengths and of angles

US4437055A · kind A · utility

17Cited by
6References
8Claims
0Family size

Inventor

Key dates

Filing dateNov 20, 1981
Grant dateMar 13, 1984
Priority date—
Expiry dateNov 20, 2001

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01D5/2415
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Several electrodes (20) are movable respective to several groups of electrodes (11 to 18). The latter receive, from modulating devices (28) modulation voltages which induce a voltage into the electrodes (20). The induced voltage is amplified in (21) and demodulated by a synchronous demodulating device (22) guided by an oscillator (23). The comparator (24) controls a binary counting device (25) the state of which constitutes a direct measurement of the relative position of the electrodes. The low-level outputs of counting device (25) govern a digital-analogical transformer (26) which delivers a modulation voltage to a function generator (27).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.