Performance Characteristics of a High-Sensitivity, Three-Wavelength, Total Scatter/Backscatter Nephelometer
Performance Characteristics of a High-Sensitivity, Three-Wavelength, Total Scatter/Backscatter Nephelometer
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DOI：
10.1175/1520-0426(1996)013
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发表时间：
1996-10
影响因子：
2.2
通讯作者：
T. Anderson;D. Covert;S. F. Marshall;M. L. Laucks;R. Charlson;A. Waggoner;J. Ogren;R. Caldow;R. L. Holm;F. R. Quant;G. Sem;A. Wiedensohler;N. Ahlquist;T. Bates
中科院分区：
文献类型：
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作者：
T. Anderson;D. Covert;S. F. Marshall;M. L. Laucks;R. Charlson;A. Waggoner;J. Ogren;R. Caldow;R. L. Holm;F. R. Quant;G. Sem;A. Wiedensohler;N. Ahlquist;T. Bates
由Beuttell和Brewer在20世纪40年代设计的积分浊度计提供了一种直接测量空气中颗粒的光散射的方法，而无需假设颗粒的组成、形状或物理状态。已经部署了大量的此类仪器;然而，只尝试了有限数量的验证实验。本文报道了一组封闭实验，其中使用气体校准的浊度计测量已知尺寸和折射率的实验室产生的颗粒的散射系数。具体地，其评估了高灵敏度、三波长、总散射/反向散射积分浊度计（TSI，Inc.，型号3563）。与气体校准程序，光子计数统计，波长和角度灵敏度的非理想性相关的不确定性的来源进行了研究。无颗粒气体的测试表明，噪声水平可以通过光子计数统计很好地预测。
Abstract As designed in the 1940s by Beuttell and Brewer, the integrating nephelometer offers a direct method of measuring light scattering by airborne particles without assumptions about particle composition, shape, or physical state. A large number of such instruments have been deployed; however, only a limited number of validation experiments have been attempted. This paper reports a set of closure experiments in which a gas-calibrated nephelometer is used to measure the scattering coefficient of laboratory-generated particles of known size and refractive index. Specifically, it evaluates the performance of a high-sensitivity, three-wavelength, total scatter/backscatter integrating nephelometer (TSI, Inc., model 3563). Sources of uncertainty associated with the gas-calibration procedure, with photon-counting statistics, and with nonidealities in wavelength and angular sensitivity are investigated. Tests with particle-free gases indicate that noise levels are well predicted by photon-counting statistics...