Method and device for detection of multiple flame types
US9587987B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2012 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Jul 29, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flame detector includes an infrared detector and a first window covering the infrared detector. A second window is positioned in front of the first window. The flame detector is adapted to reject light having a wavelength below approximately 2 μm and to reject light having a wavelength above approximately 6 μm, allowing detection of flame from multiple sources. In variations, the windows in combination with the infrared detector may provide the rejection or a band pass filter provides the rejection. Still further variations utilize notch filters or a band reject filter to provide notches of light to the infrared detector corresponding to the wavelength of different flame sources to be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.