DUAL WAVELENGTH FIRE DETECTION METHOD AND APPARATUS

摘要

A method and apparatus for extracting a number of temporal frequencies occurring in a fire and false fire condition concurrently is described. Two or more radiation detectors receive optical signals. Temporal components of the detected signal are extracted and correlated to distinguish a small fire in the presence of a larger non-fire source. The ratio at each extracted frequency following proper qualification is compared to the ratio band for fire and an output signal is generated when the ratio at one or more temporal frequencies indicates a fire.