单源双电离室烟雾传感器的研制

着重叙述单源双电离室烟雾传感器的原理和特点.检测数据表明,在外加9伏电压作用下,只要烟雾减光率>0.5％/m,就能获得1.5伏以上的输出信号,和CMOS中规模集成电路号放大和控制系统组成高灵敏、小型烟雾探测器.用单源双电离室制成的烟雾探测器,在相对湿度为90～95％环境条件下,经过高、低温( 50～-20℃)下长时间(96小时)考验,伏安特性曲线未发现明显变化;放大和控制系统正常,没有发生误报现象,可以广泛地应用于防火报警和污染检测上.

DEVELOPMENT OF SMOKE SENSOR OF SINGLE-SOURCE AND DUAL-IONIZATION CHAMBERS

This paper expounds the characteristics of the smoke sensor having single-source and dual-ionization chambers. It can be made very small, compact, highly sensitive and efficient for smoke detection. Measured data indicate that under the condition of 9 volts,we can obtain output signals over 1.5 volts as long as the rate of eliminating light is 0.5 % /m. The signals are then processed by an amplifier and a control system composed of a CMOS medium-scale integrated circuit. Thus, a highsensilivc smoke detector is formed.The smoke detector, when undergoing high and low temperature ( 50--20) tests for 96 hours under conditions of relative humidity in the 90-95% range, has not shown obvious variations in volt-ampere characteristics. The amplification and control systems are normal, with no misalarm phenomenon. The results demonstrate that the smoke sensor of single-source and dual-ionization chambers can be widely used for the prevention of fire and the detection of smoke contamination.