着火过程有释放热气、冒烟、形成火焰和温度升高四种现象连续发生。按这四种现象及易失火场所和其环境影响来选择不同的探测器,最常用的有离子探测器、光学探测器、火焰探测器和温度探测器。离子探测器适合于探测缓缓漫延的火险;光学探测器对释放的可见烟敏感;用火焰探测器探测火焰发出的射线;温度探测器适用于探测快 The process of burning heat release, smoke, the formation of flame and temperature rise four kinds of phenomena occur continuously. According to these four phenomena and easy to fire places and their environmental impact to choose different detectors, the most commonly used ion detectors, optical detectors, flame detectors and temperature detectors. The ion detector is suitable for detecting the slowly spreading fire hazard; the optical detector is sensitive to the visible smoke released; the flame detector detects the radiation emitted by the flame; the temperature detector is suitable for detecting fast