尘埃粒子计数信号幅度的对数正态分布

Lognormal Distribution of Counting Signal Amplitude of Particles

对尘埃粒子计数器计数信号幅度统计分布进行了研究,试验表明粒子光散射脉冲信号幅度分布并不具有严格的对称性.在光电传感器检测阈值附近,单径粒子脉冲信号幅度分布半宽度与信号幅度平均值相近时,与均匀划分电压通道对应的信号幅度服从对数正态分布.计算结果证明,在相对于平均值的离散度σ1的条件下,对数正态分布将趋近于正态分布.

The statistic distribution of the particle counter＇s counting signal is studied. The experiment indicates that the particle＇s optical scattering pulsed signal amplitude distribution is not strictly symmetrical. In the vicinity of the photoelectrical sensor＇s measuring threshold,when the single particle pulsed signal amplitude distribution＇s half width is similar to the average value,the signal amplitude distribution of the voltage channel which is divided equally obey the lognormal distribution. The calculated results manifest that the lognormal distribution tends to the normal distribution,in the condition of σ 〈〈 1.