Development course of very early smoke alarm

The xenon lamp used in the first generation of very early smoke alarm as the detection light source has the advantages of observing all kinds of particles from small to large, high sensitivity, simple programming, and monitoring the airflow in the detection cavity. The disadvantage is that the maintenance cost is high, the xenon tube needs to be replaced regularly (detector renovation), and the filter needs to be replaced every two years (which will reduce the sensitivity of the detector), which is expensive.

The infrared laser device is used as the detection light source in the second generation very early smoke alarm, which has lower maintenance cost, no need to transform the detector, lower cost, wider sensitivity range and smaller volume. The disadvantage is that the detection ability of fine particles is poor, and the filter still needs to be replaced once every two years (in ordinary areas), which requires computer and special software for programming. The airflow monitoring is located in the intake manifold of the detector, which makes the monitoring ability of the airflow inside the detector poor.

The third generation very early smoke alarm uses short-wavelength blue light as the detection light source, which can observe all kinds of particles from small to large (fire detection is faster in the budding stage), distinguish dust and water vapor in combustion products, improve airflow monitoring and simple programming, and do not need special tools.