Laboratory Evaluation of the Shinyei PPD42NS Low-Cost Particulate Matter Sensor
Laboratory Evaluation of the Shinyei PPD42NS Low-Cost Particulate Matter Sensor
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DOI：
10.1371/journal.pone.0137789
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发表时间：
2015-09-14
期刊：
影响因子：
3.7
通讯作者：
Yost, Michael G.
中科院分区：
文献类型：
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作者：
Austin, Elena;Novosselov, Igor;Yost, Michael G.
目标 由于监测设备的成本、尺寸和重量，对个体参与者或目标地理区域进行精细解析的 PM2.5 暴露测量可能具有挑战性。我们建议将低成本、便携式、轻量级的 Shinyei PPD42NS 粒子计数器重新用作粒子计数设备。该传感器之前的现场部署表明它可以捕获环境 PM2.5 浓度的趋势，但传感器响应的重要特征尚未确定。为了表征性能而进行了实验室测试。方法Shinyei 传感器与 TSI 气溶胶粒径分析仪 (APS) 3321 型一致，跟踪气溶胶暴露室内的颗粒衰减。测试气氛由直径为 0.75、1、2、3 和 6 um 的单分散聚苯乙烯球体以及 ASHRAE 测试粉尘 #1 的多分散气氛组成。结果传感器响应的两分钟块平均值提供了传感器内 0.75-6 μm 范围内颗粒的低随机误差测量，检测限为 1 μg/m(3)。传感器的响应斜率是惯用的，并且每个传感器都需要独特的响应曲线。线性模型捕获浓度低于 50 μ g/m(3) 的传感器响应，浓度高于 50 μ g/m(3) 时，非线性函数捕获响应并在 800 μ g/m(3) 处饱和。检测限 (LOD) 为 1 μg/m(3)。响应时间约为分钟，适合跟踪浓度的短期变化。结论与先前的评估配合使用时，这些传感器适合用作中低浓度可吸入颗粒（< 100 ug/m(3)）的环境颗粒计数器。在空间网格上部署的多个传感器将提供 PM2.5 的宝贵时空变化，并可用于验证暴露模型。当与 GPS 跟踪配合使用时，这些设备有可能为大量参与者提供时间和空间分辨的暴露测量，从而提高研究的力度。
ObjectiveFinely resolved PM2.5 exposure measurements at the level of individual participants or over a targeted geographic area can be challenging due to the cost, size and weight of the monitoring equipment. We propose re-purposing the low-cost, portable and lightweight Shinyei PPD42NS particle counter as a particle counting device. Previous field deployment of this sensor suggests that it captures trends in ambient PM2.5 concentrations, but important characteristics of the sensor response have yet to be determined. Laboratory testing was undertaken in order to characterize performance.MethodsThe Shinyei sensors, in-line with a TSI Aerosol Particle Sizer (APS) model 3321, tracked particle decay within an aerosol exposure chamber. Test atmospheres were composed of monodisperse polystyrene spheres with diameters of 0.75, 1, 2 3 and 6 um as well as a polydisperse atmosphere of ASHRAE test dust #1.ResultsTwo-minute block averages of the sensor response provide a measurement with low random error, within sensor, for particles in the 0.75-6 mu m range with a limit of detection of 1 mu g/m(3). The response slope of the sensors is idiomatic, and each sensor requires a unique response curve. A linear model captures the sensor response for concentrations below 50 mu g/m(3) and for concentrations above 50 mu g/m(3) a non-linear function captures the response and saturates at 800 mu g/m(3). The Limit of Detection (LOD) is 1 mu g/m(3). The response time is on the order of minutes, making it appropriate for tracking short-term changes in concentration.ConclusionsWhen paired with prior evaluation, these sensors are appropriate for use as ambient particle counters for low and medium concentrations of respirable particles (< 100 ug/m(3)). Multiple sensors deployed over a spatial grid would provide valuable spatio-temporal variability in PM2.5 and could be used to validate exposure models. When paired with GPS tracking, these devices have the potential to provide time and space resolved exposure measurements for a large number of participants, thus increasing the power of a study.