Moisture meter
US4788853A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1986 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Oct 7, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N22/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A moisture meter and method for determining moisture content in a mass of material is provided. A source of microwave radiation selectively produces radiation having a plurality of different frequencies and directs the radiation into the mass of material. A support is provided for the material, which is substantially transparent to the radiation. A detector determines the emergent intensity of the radiation of each frequency traversing the mass of material and the support. A signal processing unit, responsive to (1) an intensity level of incident radiation directed into the mass of material, (2) a level of the emergent intensity of the radiation after passage through the mass of material and the support, and (3) the selective radiation frequencies, determines a value characteristic of moisture content based upon a slope of a plot of attenuation representing a difference between the intensity level of the incident radiation and the emergent radiation versus each of the plurality of different frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.