Dielectric detecting system
US5467022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1993 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Jan 15, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60N2210/12
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A dielectric detecting system comprises: an earth electrode; a sensor electrode opposed to the earth electrode for constituting a first condenser therebetween whose electric capacitance varies in dependence on an existence of the dielectric; a medium electrode positioned between the earth electrode and the sensor electrode for constituting a second condenser between the medium electrode and the earth electrode and a third condenser between the medium electrode and the sensor electrode in such a manner that one of an electric capacitance of the second condenser and an electric capacitance of the third condenser serves for detecting an other dielectric; and an operational amplifier for equalizing electric potential of the medium electrode to that of the sensor electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.