一　引言在国外光电感烟探测器已得到了普遍的采用，但由于这种基于散射光原理的探测器，对黑烟与白烟的探测灵敏度具有很大的差别，使其应用场合受到很大的限制。从这个意义上来讲，它还不能从根本上代替传统的离子感烟探测器。然而我国与德国西门子股份公司进行技术合作引进 I. INTRODUCTION Photoelectric smoke detectors have been widely used in foreign countries. However, due to the detector based on the principle of scattered light, the detection sensitivities to black smoke and white smoke are quite different, which makes their applications greatly affected limits. In this sense, it can not fundamentally replace the traditional ion smoke detectors. However, our country and Germany’s Siemens AG for technical cooperation