离子烟密度计是测量离子感烟探测器响应阈值的关键性仪器。我院电子仪器厂和公安部沈阳消防科研所共同研制的FH4503型离子烟密度计,由于测量电路是采用较复杂的逻辑电路,给调试和维修带来不便,功能也不易扩充,稳定性和测量精度也有待进一步提高。为此,我们利用单片机技术取代逻辑电路,扩充了离子烟密度计的功能,进 Ion smoke density meters are the key instruments for measuring the response threshold of ion smoke detectors. FH4503-type ion smoke density meter jointly developed by our institute’s electronic instrument factory and Shenyang Fire Research Institute of Ministry of Public Security has inconvenience in debugging and maintenance because of its complicated logic circuit. Its function is not easy to expand, its stability and measurement Accuracy needs to be further improved. For this reason, we use the one-chip computer technology to replace the logic circuit, has expanded the function of the ion smoke density meter, enters