Microwave moisture sensing via waveguide with slot array
US6903557B2 · kind B2 · utility
6Cited by
3References
24Claims
0Family size
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Inventors
Key dates
| Filing date | Oct 11, 2001 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | Dec 9, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A generator (6) directs microwave signals to a waveguide (1) having a linear array of slots (2), and the signals are received by measuring device (5). The local permittivity or moisture content of material adjacent the waveguide (1), such as a stack of timber, may be determined at each slot (2) via regression analysis. The total permittivity or moisture may be determined by averaging measurements obtained for both transmission directions of the waveguide (1). The apparatus may be used for controlling drying parameters, such as drying time, for the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.