尘埃粒子计数器信号传输特性研究

The study of signal transmission characteristic in airborne particle counter

为了研究尘埃粒子计数器信号传输的本质特性,采用从单粒子信号出发的方法,在研究单粒子散射光收集特性、光电转换特性的基础上分析单径粒子群信号分布的统计特性及混合粒子群在传感器中的输入-输出信号传输特性,并进行了实验验证,实验值与理论值基本一致,相关系数高达0.9以上。结果表明,尘埃粒子计数器的信号传输特性的本质是将粒子群的粒径分布描述方式以线性变换的方式转换成相应的脉冲信号幅值分布描述方式。这一结果为促进仪器向大流量、高灵敏方向发展奠定了理论基础。

In order to study the essential characteristic of airborne particle counter signal transmission, some basic characteristics of airborne particle counter are studied with proceeding from single particle signal, including collecting characteristic of scattered light and photoelectric transfer characteristic. Based on these, statistics characteristic of signal distribute of single particle group and signal transmission characteristic of mixed particles group were analyzed. At the same time, the experiment was performed and the result is consistent with the theory with the correlation coefficient more than 0.9. Results indicate the essence of airborne particle counter signal transmission is changing particle＇s diameter distribute way to corresponding pulse signal amplitude distribute way with linear transform. All these establish the theoretical foundation for promoting the instrument＇s development toward the large flow and high sensitivity.