Method and device for detecting smoke
US9201051B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 2011 |
| Grant date | Dec 1, 2015 |
| Priority date | — |
| Expiry date | Jun 3, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The smoke detector includes: a chamber (1) provided with apertures (3) allowing the smoke to enter a detection area (D), a light source (S) configured to emit towards the detection area (D), and a light receiver (R) configured so as to receive the light coming from the detection area (D). A concentration element (6, 7) is provided so as to create a non-uniform electric field in the detection area (D), that, in the presence of smoke, can polarize smoke particles entering the detection area (D). The non-uniform electric field has a spatial gradient configured to exert a dielectrophoretic force on the smoke particles so as to drive the polarized smoke particles into a concentration zone (C) in the detection area (D) and to aggregate them together to form quasi “big particles”.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.