Arrangement in infrared analyzers
US4563581A · kind A · utility
Inventor
Key dates
| Filing date | Jun 29, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Jun 29, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3563
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to an arrangement in an infrared analyzer for determining the proportion of a given substance or substances in a powderous material, such as flour. When making an analysis, the infrared analyzer irradiates the material with infrared light and detects light reflected from the material through a window in the wall of a conduit, in which the material is passed in a direction substantially parallel with the window. During the analysis, the material is held stationary, and compacted in the conduit. The conduit has arranged therein a feed screw having a controllable drive-means in a material-infeed end, and extends horizontally or slopes upwardly from the aforementioned infeed end. A control means steers the drive means and the analyzer cyclically in a manner such that during a first time interval the drive means is activated and the analyzer inactivated, and that during a second time period the analyzer is activated and the drive means inactivated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.