Capacitance probe sensor device
US4389900A · kind A · utility
21Cited by
19References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1980 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Dec 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01W1/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance probe sensor device is disclosed which has a probe formed of KYNAR insulated wire spaced from an uninsulated metallic ground electrode. An oscillator and associated capacitance-resistance network connected to the probe serve to provide a linear output voltage proportional to the change of capacitance between the insulated wire and the ground electrode. The capacitance probe sensor device can be used in a number of applications. They include the measurement of water level, the determination of a liquid's flow rate, and the moisture content of soil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.