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The response signal trends of ordinary ionization and photoelectric detectors under high altitude area were predicted using a simple model. The analysis results showed that the response trend varied with the pressure at 2nd power law for ionization detector, and 4th power law for photoelectric detector, which indicates that the signal performance of point-type smoke detector decreased with increasing...
A technique for characterization of smoke particles is described. The technique was established through measurements using a polarization modulated angular scanning scatterometer to completely characterize the intensity and polarization of the scattered light. The physical and optical properties of the particles were extracted from the measured data by combining light scattering modeling. Preliminary...
This paper presents a new smoke concentration measurement system, which is designed based on the theory of light extinction. To implement the technique we developed, the hardware system, including a reflecting light path, balanced circuit design, and reasonable data acquisition and processing system, is constructed. In particular, a set of photodiode and preamplifier is specially applied and adjusted...
The system uses nRF2401 for short-range wireless communications, GPRS for long-distance wireless communications, ARM9 for center console, Wireless Multi-sensor Fire Detector for node, and BP algorithm is used for judging the probability of fire. Wireless Multi-sensor Fire Detector is formed of the low-power electrochemical carbon monoxide sensor, photoelectric smoke detector and semiconductor temperature...
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