Electrometer
US3997839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1974 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Nov 25, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R5/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The device measures electrical charges, an electrical voltage or an electrical current, present between two electrodes of which one is fixed and of which the other is mounted so as to be able to vibrate mechanically. One of the two electrodes is connected to ground. Energizing means apply an AC voltage V.sub.o of frequency f.sub.o between the two electrodes. Means are provided for detecting the amplitude of the mechanical vibrations of frequency f.sub.o of the vibrating electrode and means for measuring this amplitude, which is a function of the parameter to be measured. The means for detecting and measuring the amplitude of the mechanical vibrations is a piezo-electric element subject to these vibrations and an apparatus adapted to measure the AC voltage produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.