Abstract A method to determine the cutoff diameter and counting efficiency of single-particle optical particle counters (OPC) is presented. An aerodynamic aerosol classifier (AAC) coupled with an atomizer was used to generate monodisperse dioctyl phthalate particles with a condensation particle counter (CPC) as the reference instrument. This method is accurate for capturing the counting efficiency of OPCs at lower size ranges and determining the cutoff diameter. The CPC was found to be a poor reference instrument for particles larger than 1 µm in which case an inkjet aerosol generator (IAG) was used as the monodisperse particle source and reference instrument. Two different particle materials were used with the IAG: lactose monohydrate and an ionic liquid (1-ethyl-3-methylimidazolium trifluoromethanesulfonate). A combination of the AAC to size smaller particles (<1 µm) and IAG to generate larger particles (>1 µm) was found to provide a comprehensive method capable of covering the counting efficiency over the entire operating range of OPCs. Copyright © 2020 American Association for Aerosol Research

中文翻译：

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使用气动气溶胶分级器和喷墨气溶胶发生器确定光学粒子计数器的截止直径和计数效率

摘要 提出了一种确定单粒子光学粒子计数器 (OPC) 截止直径和计数效率的方法。空气动力学气溶胶分级器 (AAC) 与雾化器相结合，以凝聚粒子计数器 (CPC) 作为参考仪器，生成单分散邻苯二甲酸二辛酯粒子。该方法可准确捕获较低尺寸范围内 OPCs 的计数效率并确定截止直径。发现 CPC 对于大于 1 µm 的颗粒来说是一种较差的参考仪器，在这种情况下，使用喷墨气溶胶发生器 (IAG) 作为单分散颗粒源和参考仪器。IAG 使用两种不同的颗粒材料：乳糖一水合物和离子液体（1-乙基-3-甲基咪唑鎓三氟甲磺酸盐）。发现将 AAC 用于确定较小颗粒 (<1 µm) 的尺寸和 IAG 用于生成较大颗粒 (>1 µm) 的组合提供了一种综合方法，能够覆盖整个 OPC 操作范围内的计数效率。版权所有 © 2020 美国气溶胶研究协会