Abstract We compared the performance of a low-cost (∼$500), compact optical particle counter (OPC, OPC-N2, Alphasense) to another OPC (PAS-1.108, Grimm Technologies) and reference instruments. We measured the detection efficiency of the OPCs by size from 0.5 to 5 µm for monodispersed, polystyrene latex (PSL) spheres. We then compared number and mass concentrations measured with the OPCs to those measured with reference instruments for three aerosols: salt, welding fume, and Arizona road dust. The OPC-N2 detection efficiency was similar to the PAS-1.108 for particles larger than 0.8 µm (minimum of 79% at 1 µm and maximum of 101% at 3 µm). For 0.5-µm particles, the detection efficiency of the OPC-N2 was underestimated at 78%, whereas PAS-1.108 overestimated concentrations by 183%. The mass concentrations from the OPCs were linear (r ≥ 0.97) with those from the reference instruments for all aerosols, although the slope and intercept were different. The mass concentrations were overestimated for dust (OPC-N2, slope = 1.6; PAS-1.108, slope = 2.7) and underestimated for welding fume (OPC-N2, slope = 0.05; PAS-1.108, slope = 0.4). The coefficient of variation (CV, precision) for OPC-N2 for all experiments was between 4.2% and 16%. These findings suggest that, given site-specific calibrations, the OPC-N2 can provide number and mass concentrations similar to the PAS-1.108 for particles larger than 1 µm. Copyright © 2016 American Association for Aerosol Research

中文翻译：

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Alphasense 光学粒子计数器 (OPC-N2) 和 Grimm 便携式气溶胶光谱仪 (PAS-1.108) 的评估


摘要 我们将低成本（约 500 美元）、紧凑型光学粒子计数器（OPC、OPC-N2、Alphasense）与另一种 OPC（PAS-1.108、Grimm Technologies）和参考仪器的性能进行了比较。我们测量了尺寸为 0.5 至 5 µm 的单分散聚苯乙烯乳胶 (PSL) 球体 OPC 的检测效率。然后，我们将使用 OPC 测量的数量和质量浓度与使用参考仪器测量的三种气溶胶（盐、焊接烟雾和亚利桑那州道路灰尘）的数量和质量浓度进行了比较。对于大于 0.8 µm 的颗粒，OPC-N2 的检测效率与 PAS-1.108 相似（1 µm 时最小值为 79%，3 µm 时最大值为 101%）。对于 0.5 µm 颗粒，OPC-N2 的检测效率被低估为 78%，而 PAS-1.108 的浓度高估了 183%。对于所有气溶胶，OPC 的质量浓度与参考仪器的质量浓度呈线性 (r ≥ 0.97)，尽管斜率和截距不同。粉尘的质量浓度被高估（OPC-N2，斜率 = 1.6；PAS-1.108，斜率 = 2.7），焊接烟雾的质量浓度被低估（OPC-N2，斜率 = 0.05；PAS-1.108，斜率 = 0.4）。所有实验中 OPC-N2 的变异系数（CV、精度）均在 4.2% 至 16% 之间。这些发现表明，在进行特定地点校准的情况下，OPC-N2 可以为大于 1 µm 的颗粒提供与 PAS-1.108 类似的数量和质量浓度。版权所有 © 2016 美国气溶胶研究协会