Electrical moisture sensor
US4288742A · kind A · utility
8Cited by
9References
4Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Dec 18, 1979 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Dec 18, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A moisture sensor including a probe formed with a first ring of spines extending in parallel outward from a base and a second ring of spines extending in parallel outward from the base separated and insulated from the first ring, the spines forming an effective coaxial capacitor and being insertable into material to be sensed and an RC bridge circuit, preferably a Wien bridge connected to the rings to measure the impedance of the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.