摘要：以电解液NaCl浓度、增益、电流为因素,以仪器的噪声水平为实验指标设计正交实验,运用SPSS17.0数理统计软件对实验进行极差分析、方差分析,并绘制因素-指标趋势图。结果表明:通过方差分析得出增益和电流对噪声水平影响显著,NaCl浓度对噪声水平影响不显著,显著性由大到小的因素顺序为电流、增益、NaCl浓度;根据极差分析和趋势图,控制库尔特Multisizer3型粒度仪噪声水平的最佳条件是电解液NaCl浓度(质量分数)为4%,增益设置为32,电流设置为-800μA;根据最佳条件,噪声水平可减至0.404μm。

关键词：粒度仪；噪声水平；正交设计；SPSS 软件

Abstract：Taking the concentration of NaCl electrolyte, gain and current as experimental factors and the noise level as an experimental indicator,an orthogonal experiment was designed. By employing the mathematical statistical software SPSS17.0, the range analysis and variance analysis were conducted on the experiment and tendency charts about factors and indicators were drawn. The results show that the current and gain have significantly effect on noise level, and the effect of the NaCl concentration on noise level is not significant. The order of factors according to their significance from great to small is current, gain, NaCl concentration.According to the range analysis and tendency chart, the optimum conditions to control noise level of Coulter Multisizer 3 particle size meter are as follows. The concentration of electrolyte NaCl is 4%, the gain is set to 32, the current is set to-800 μA. Based on the optimal conditions, the noise level can be reduced to 0.404 μm.

Keywords: particle size meter；noise level；orthogonal design；SPSS software