Flame detector
US4157506A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1977 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Dec 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for processing signals produced by a flame detector. A phase-locked loop is used to generate a binary indication of whether the signal from a flame probe is within a predetermined frequency band. A signal indicative of the average analog value of the resulting pulse train is produced and tested to determine whether it is in a range consistent with flame presence. The resultant binary signal is ANDed with a binary determination of whether the average DC value of the probe signal is within a range consistent with flame presence, and if both the DC and the frequency indications imply possible flame presence, then flame presence is indicated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.