ABSTRACT We describe development of a portable aerosol mobility spectrometer (PAMS) for size distribution measurement of submicrometer aerosol. The spectrometer is designed for use in personal or mobile aerosol characterization studies and measures approximately 22.5×22.5×15 cm and weighs about 4.5 kg including the battery. PAMS uses electrical mobility technique to measure number-weighted particle size distribution of aerosol in the 10–855 nm range. Aerosol particles are electrically charged using a dual-corona bipolar corona charger, followed by classification in a cylindrical miniature differential mobility analyzer. A condensation particle counter is used to detect and count particles. The mobility classifier was operated at an aerosol flow rate of 0.05 L/min, and at two different user-selectable sheath flows of 0.2 L/min (for wider size range 15–855 nm) and 0.4 L/min (for higher size resolution over the size range of 10.6–436 nm). The instrument was operated in voltage stepping mode to retrieve the size distribution in approximately 1–2 min. Sizing accuracy and resolution were probed and found to be within the 25% limit of NIOSH criterion for direct-reading instruments. Comparison of size distribution measurements from PAMS and other commercial mobility spectrometers showed good agreement. The instrument offers unique measurement capability for on-person or mobile size distribution measurement of ultrafine and nanoparticle aerosol.

中文翻译：

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开发用于个人和移动气溶胶测量的便携式气溶胶迁移率光谱仪


摘要 我们描述了用于亚微米气溶胶尺寸分布测量的便携式气溶胶迁移谱仪（PAMS）的开发。该光谱仪设计用于个人或移动式气溶胶表征研究，尺寸约为 22.5×22.5×15 厘米，含电池重量约为 4.5 千克。 PAMS 使用电迁移率技术来测量 10-855 nm 范围内气溶胶的数量加权粒径分布。使用双电晕双极电晕充电器对气溶胶颗粒进行充电，然后在圆柱形微型微分迁移率分析仪中进行分类。凝结粒子计数器用于检测和计数粒子。迁移率分级器的运行气溶胶流速为 0.05 L/min，用户可选择两种不同的鞘流：0.2 L/min（适用于更宽的粒径范围 15–855 nm）和 0.4 L/min（适用于更高的粒径分辨率）尺寸范围为 10.6–436 nm）。仪器在电压步进模式下运行，可在大约 1-2 分钟内检索尺寸分布。对尺寸精度和分辨率进行了探讨，发现其在 NIOSH 直读仪器标准的 25% 限制范围内。 PAMS 和其他商用迁移谱仪的尺寸分布测量结果的比较显示出良好的一致性。该仪器提供独特的测量功能，可用于超细和纳米颗粒气溶胶的现场或移动尺寸分布测量。