Fire Safety Science Digital Archive

Details of a fire detection system using the deflection of a laser beam above a fire are described. It is shown that such a system will decrease in sensitivity with the height of the compartment to be protected at a lower rate than with point detection systems. Devices are described for preventing false alarms due either to building disturbances or to ambient variations in temperature. It is claimed that such a system would have economic advantages over other systems and that it could readily be adapted to give intruder protection.