Optical product detection sensor
US7924424B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2009 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Sep 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0627
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical detection sensor detects presence or absence of a product within a fluid delivery medium. An emitter directs radiation into the fluid delivery medium and detectors detect transmitted light at a plurality of wavelengths. The output of each detector and combinations of outputs of multiple detectors are associated with at least one out-of-product threshold. In addition, a color ratio is established. A controller compares the detector outputs and combination outputs with the associated out-of-product threshold(s). If any of the thresholds are satisfied, the controller compares the color ratio with an associated out-of-product threshold to verify an out-of-product event has occurred and reduce errors due to batch-to-batch variation of the product. The sensor is able to determine presence or absence of a variety of products having different color, transparency or turbidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.