Processor-Aided Fire Detector.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This abstract describes a fire detection system which includes an environmental sampling assembly coupled to a programmable digital processor for detecting a threat of fire and reducing the occurrences of false alarms in a changing environment. The sampling assembly comprises a network of air ducts, a chamber, two sensors, and an exhaust fan. The processor includes two analog-to-digital AD converters, a multiplexed digital summer, short and long-term storage mediums, a signal magnitude comparator, logic circuitry, and a timing generator. The fan continuously draws ambient air through the air ducts and the chamber. Sensors within the chamber sample the air. If the sensors detect particulates of combustion in the air, the sensors provide electrical signals of varying amplitudes, which amplitudes being sampled, to the AD converters of the processor. One of the sensors also feeds its signals to the fan motor for increasing the speed of the fan, thereby clearing the chamber and drawing air through the chamber at a faster rate for a more vigorous sampling of the environment. The processor may be programmed to suit a specific environment. It monitors the amplitudes of the signals from the assembly and the rate and duration of changes in the amplitudes by comparing signal samples at successive intervals of time. The processor activates a four-level, visual alarm which indicates the progression or regression of a threat of fire.
- Computer Programming and Software
- Computer Hardware
- Safety Engineering