Optical flame and explosion detection system and method
US4220857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Nov 1, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2229/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Optical flame and explosion detection system having first and second channels with each of the channels being responsive to different combustion products and detecting radiation from the combustion products and converting the radiation into electrical signals. A filter is provided in each of the channels to limit the spectral response to a narrow band. The levels of the radiation are ascertained by level detectors which provide first and second signals when predetermined signal levels are reached in the first and second channels. A ratio of the two electrical signals from the first and second channels is ascertained. When a predetermined level is reached from the ratio of the electrical signals and also for the individual signals, an output signal is produced which can be utilized in actuating alarms and other devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.