Based on photoelectric detecting principles, an advanced smoke concentration automatic measuring system with computer and photoactive sensor has been developed.
根据光电检测原理，并结合计算机研制出一种先进的烟尘浓度测定系统。
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A new very-early-warning fire detector from System Sensor of St. Charles, Illinois, protects personnel and assets from fire by detecting the faintest traces of smoke in challenging environments.