Atmospheric size distributions measured by differential mobility optical particle size spectrometry
Atmospheric size distributions measured by differential mobility optical particle size spectrometry
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DOI：
10.1080/02786829808965579
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发表时间：
1998-11-01
影响因子：
5.2
通讯作者：
Hering, S
中科院分区：
文献类型：
--
作者：
Stolzenburg, M;Kreisberg, N;Hering, S
研制了一台差示迁移率光学粒度谱仪(DMOPSS)，用于测量环境中0.1~1.0微米直径范围内颗粒的几何尺寸分布。DMOPSS由高速差动迁移率分析仪(HF-DMA)、光学粒子计数器(OPC)和凝聚核计数器(CNC)并行运行组成。OPC和CNC从HF-DMA输出中采样已知几何直径的单分散气溶胶，或者直接从环境空气中采样已知稀释度的多分散气溶胶。单分散样品用于建立与时间相关的OPC校准，为研究中的环境气溶胶提供光学响应和几何尺寸。然后，使用这种基于环境的校准来减少直接的环境测量。1992年夏天在亚利桑那州梅德维尤对DMOPSS系统进行了实地测试，在那里收集了12,000多个大小光谱；它们包括大约三分之一的直接环境样本和三分之二的HF-DMA大小样本。测量的气溶胶体积和计算的颗粒散射系数与浊度计的测量结果有很强的相关性，平均散射体积比为5m(2)/cm(3)。使用环境气溶胶校正后，测量的气溶胶体积比使用聚苯乙烯乳胶校正获得的气溶胶体积大47%，体积几何平均直径大12%。(C)1998年美国气溶胶研究协会。
A differential mobility and optical particle size spectrometer (DMOPSS) was developed to measure ambient size distributions based on geometric particle diameter in the size range of 0.1 to 1.0 mu m diameter. The DMOPSS consists of a high-how differential mobility analyzer (HF-DMA) followed by an optical particle counter (OPC) and condensation nucleus counter (CNC) operating in parallel. The OPC and CNC sample monodisperse aerosol of known geometric diameter from the HF-DMA output or, alternatively, polydisperse aerosol with known dilution directly from the ambient air. The monodisperse samples are used to create time-dependent calibrations of the OPC, providing optical response versus geometric size for the ambient aerosol under study. The direct ambient measurements are then reduced, using this ambient-based calibration. A field test of the DMOPSS system was performed in the summer of 1992 at Meadview, Arizona, where more than 12,000 size spectra were collected; they consisted of roughly one-third direct ambient samples and two-thirds HF-DMA sized samples. Measured aerosol volumes and calculated particle scattering coefficients were strongly correlated with nephelometer measurements, with a mean scattering-to-volume ratio of 5 m(2)/cm(3). With the ambient aerosol calibration, the measured aerosol volumes were 47% larger, and volume geometric mean diameters were 12% larger, than would have been obtained using a polystyrene latex calibration. (C) 1998 American Association for Aerosol Research.