Electrostatic voltmeter
US4197493A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | May 11, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrostatic voltmeter for measuring the electrostatic potential on a photosensitive drum has a detector capacitively coupled to the drum for providing an output signal in response to the potential on the drum. An AC voltage source is coupled in circuit with the drum and the detector for applying an AC signal across the surface-to-detector capacitance. Circuitry coupled to the detector determines the detector gain in response to the value of the AC component of the output signal and the value of the applied AC signal. The product of the reciprocal of the detector gain and the value of the DC component of the output signal is representative of the electrostatic potential on the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.