of Birmingham Evaluation of a low-cost optical particle counter (Alphasense OPC-N2) for ambient air monitoring
of Birmingham Evaluation of a low-cost optical particle counter (Alphasense OPC-N2) for ambient air monitoring
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发表时间：
2018
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通讯作者：
L. Crilley;M. Shaw;R. Pound;L. Kramer;Robin Price;S. Young;A. Lewis;F. Pope
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作者：
L. Crilley;M. Shaw;R. Pound;L. Kramer;Robin Price;S. Young;A. Lewis;F. Pope
.一个快速发展的研究领域是开发用于测量空气污染物的低成本传感器。低成本颗粒传感器的可负担性和尺寸使其成为需要大量仪器的实验中的一个有吸引力的选择，例如高密度空间映射。然而，这些低成本的传感器要对这些类型的研究有用，其准确性和精度需要量化艾德。我们评估了Alphasense OPC-N2，一种有前途的低成本微型光学粒子计数器，用于监测英国典型城市背景站点的环境空气中的颗粒物。OPC-N2的精密度通过将14台仪器放置在同一地点来评估，以研究测量浓度的变化。通过与两种不同的参考光学粒子计数器以及TEOM-FDMS进行比较，可以评估OPC-N2的准确度。OPC-N2与参考光学仪器的比较显示了测量PM 1、PM 2质量浓度的一些局限性。5、PM 10 OPC-N2在高环境相对湿度（> 85%）期间的测量颗粒质量中显示出显著的正伪影，并根据κ -Köhler理论，使用平均散装颗粒气溶胶吸湿性开发了校准因子。该RH校正因子的应用导致OPC-N2测量值在TEOM-FDMS的33%内，与参考光学颗粒计数器和TEOM-FDMS之间的一致性（20%）相当。14个OPC-N2传感器的单元间精密度为±，10个质量浓度为OPC-N2
. A fast-growing area of research is the development of low-cost sensors for measuring air pollutants. The affordability and size of low-cost particle sensors makes them an attractive option for use in experiments requiring a number of instruments such as high-density spatial mapping. However, for these low-cost sensors to be useful for these types of studies their accuracy and precision need to be quantified. We evaluated the Alphasense OPC-N2, a promising low-cost miniature optical particle counter, for monitoring ambient airborne particles at typical urban background sites in the UK. The precision of the OPC-N2 was assessed by co-locating 14 instruments at a site to investigate the variation in measured concentrations. Comparison to two different reference optical particle counters as well as a TEOM-FDMS enabled the accuracy of the OPC-N2 to be evaluated. Comparison of the OPC-N2 to the reference optical instruments shows some limitations for measuring mass concentrations of PM 1 , PM 2 . 5 and PM 10 . The OPC-N2 demonstrated a significant positive artefact in measured particle mass during times of high ambient RH (> 85 %) and a calibration factor was developed based upon κ -Köhler theory, using average bulk particle aerosol hygroscopicity. Application of this RH correction factor resulted in the OPC-N2 measurements being within 33 % of the TEOM-FDMS, comparable to the agreement between a reference optical particle counter and the TEOM-FDMS (20 %). Inter-unit precision for the 14 OPC-N2 sensors of ± for 10 mass concentrations was the OPC-N2