Modern signal processing for temperature fluctuation based fire detectors

We suggest use of the high frequency part of the temperature signal or the temperature fluctuations in addition to or as a replacement for the common fire detector which is based only on a lowpass filtered (smoothed) temperature signal. Furthermore, a signal processing method distinguishing fire from non-fire situations using fire detectors that measure temperature fluctuations is presented. This method is partly based on the interpretation of the sensor output signals as a linear filtered stochastic process which enabled the reconstruction of the input signals from known output signals. We show the advantage of this method through application to many fire and non-fire situations.