Fire identification and discrimination method and apparatus

摘要

In a method and apparatus for determining the fuel of a fire, an ionization detector is positioned to detect the ionization level in the fire gases. The natural logarithm of the ratio of the ambient ionization current when there is no fire to the change in ionization current from the ambient level is multiplied times a second characteristic, which may be the optical density, the change in carbon monoxide concentration from ambient, or the change in carbon dioxide concentration from ambient. The resulting product of this multiplication will be a value indicating the fuel being consumed in the fire. A chart recorder is connected to record the product of the multiplication.