Apparatus and method for sensing multiple parameters of sheet material
US4789820A · kind A · utility
35Cited by
29References
50Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 11, 1986 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Jul 11, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/314
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for simultaneously generating spatial profiles of moisture, thickness, and basis weight across a moving web of paper in a paper making machine. The apparatus includes a plurality of means for generating first and second beams of coherent microwave radiation and for generating signals proportional to the intensity of radiation applied to, reflected from, and transmitted through the web. The incident, reflectance, and transmittance signals for the two frequencies are used to solve simultaneous equations to generate moisture, thickness, and basis weight values at various positions across the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.