False alarm immunity of single spectral sensor using multi-channel frequency segmentation

Abstract

An optical flame detection system includes a housing having a window and a single infrared sensor positioned proximate the window and configured to receive infrared illumination through the window. A digitizer is operably coupled to the single infrared sensor and is configured to provide a digital representation of an analog sensor signal obtained from the single infrared sensor. A processor is operably coupled to the digitizer and is configured to receive a series of time-spaced digital representations from the digitizer and classify individual representations into a plurality of groups. The processor is further configured to determine a first intensity value for a first group of the plurality of groups and a second intensity value for the second group of the plurality of groups. The processor is further configured to calculate a ratio between the first intensity value and the second intensity value and to compare the calculated ratio to a threshold to provide a flame detection decision output having improved false alarm immunity. A computer-implemented method of optical flame detection using a single infrared sensor is also provided.

Dependencies are inferred from the claim text.