This technology integrates a fine dust sensor, which measures airborne particles via light scattering, and a control unit into a housing mounted on building ceilings or walls. It functions as an air quality monitor during normal operation and detects fires in real time when smoke particle levels spike.
Conventional photoelectric fire detectors allow airflow caused by fire to enter directly toward the light-emitting and light-receiving sensors through case openings. This leaves the sensors vulnerable to heat damage if initial suppression fails and indoor temperatures rise rapidly. Once damaged, these sensors can no longer transmit critical information regarding fire location or intensity as the fire escalates.
This technology features a cylindrical chamber inside the housing with multiple partition plates extending toward the center. A fine dust sensor is placed between a pair of these plates, which are made of shape-memory alloy that deforms to close around and protect the sensor when heated. By incorporating a temperature and humidity sensor, the system can confirm a fire when smoke detection coincides with a temperature rise. Suitable for hotel rooms, residential units, offices, and smart building IoT safety systems, this device provides both daily air quality management and fire alerts, while maintaining signal transmission longer even after a fire has intensified.
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