Photometer response determination based on aerosol physical characteristics
Photometer response determination based on aerosol physical characteristics
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DOI：
10.1080/15428110208984743
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发表时间：
2002-09-01
期刊：
影响因子：
--
通讯作者：
Slagley, JM
中科院分区：
文献类型：
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作者：
O'Shaughnessy, PT;Slagley, JM
气溶胶光度计通常根据总气溶胶浓度或可吸入气溶胶浓度的现场测量值进行校准。但是，如果气溶胶大小分布发生变化，这些仪器对特定气溶胶浓度水平的响应将发生变化。为了确定一个可预测的校正因子，将光度计与气溶胶的重量测量相联系，作者对光度计响应与颗粒大小分布、密度和折射率的关系进行了分析。在不同浓度水平下进行了一系列试验，使用的是亚利桑那州的道路粉尘和碾碎的玉米粉尘。校正系数是根据仪器相对于粒径的响应模式，以及实际尘埃密度和折射率相对于用于校准仪器的尘埃密度和折射率的比率来计算的。结果表明，计算出的校正因子在10%以内，从线性回归斜率预测的校正因子有关的重量测量平均值的光度计读数在样本周期内。
Aerosol photometers often are calibrated against field measurements of total or respirable aerosol concentrations. However, the response of these instruments to a particular aerosol concentration level will change if there is a change in aerosol size distribution. To determine a predictable correction factor that relates photometer to gravimetric measurements of an aerosol, the authors performed an analysis of photometer response relative to particle size distribution, density, and refractive index. A series of trials was performed at different concentration levels using both Arizona road dust and ground corn dust. The correction factor was calculated from a knowledge of the instrument response pattern relative to particle size, as well as the ratios of actual dust density and refractive index relative to that of the dust used to calibrate the instruments. Results demonstrated that the calculated correction factors were within 10% of a correction factor predicted from the slope of a linear regression relating gravimetric measurements to the average of photometer readings taken during the sample period.