Calibration of the passive cavity aerosol spectrometer probe for airborne determination of the size distribution
Calibration of the passive cavity aerosol spectrometer probe for airborne determination of the size distribution
复制标题
DOI：
10.5194/amt-6-2349-2013
复制
发表时间：
2013-01-01
影响因子：
3.8
通讯作者：
Wechsler, P.
中科院分区：
文献类型：
--
作者：
Cai, Y.;Snider, J. R.;Wechsler, P.
本文介绍了被动腔气溶胶谱仪探头（PCASP）的粒子测量和粒子浓度系统的标定方法。实验室校准进行了六年，在云物理研究飞机上部署的PCASP的支持，进行了分析。代替使用PCASP制造商推荐的许多校准尺寸，使用三种尺寸的迁移率选择的聚苯乙烯乳胶颗粒建立颗粒直径和散射光强度之间的关系，每个放大器增益级一个。此外，研究了影响PCASP测定粒度分布的两个因素-放大器基线和颗粒形状。结果表明，PCASP衍生的粒径分布是敏感的调整的尺寸系统的基线电压，和聚集体的领域，PCASP衍生的粒径和球等效粒径同意内的不确定性所规定的PCASP的尺寸分辨率。对气溶胶浓度和粒度分布的稳健测定还需要校准PCASP的气溶胶流量传感器。记录传感器校准、校准漂移和传感器的非线性响应。
This work describes calibration methods for the particle sizing and particle concentration systems of the passive cavity aerosol spectrometer probe (PCASP). Laboratory calibrations conducted over six years, in support of the deployment of a PCASP on a cloud physics research aircraft, are analyzed. Instead of using the many calibration sizes recommended by the PCASP manufacturer, a relationship between particle diameter and scattered light intensity is established using three sizes of mobility-selected polystyrene latex particles, one for each amplifier gain stage. In addition, studies of two factors influencing the PCASP's determination of the particle size distribution - amplifier baseline and particle shape - are conducted. It is shown that the PCASP-derived size distribution is sensitive to adjustments of the sizing system's baseline voltage, and that for aggregates of spheres, a PCASP-derived particle size and a sphere-equivalent particle size agree within uncertainty dictated by the PCASP's sizing resolution. Robust determinations of aerosol concentration, and size distribution, also require calibration of the PCASP's aerosol flowrate sensor. Sensor calibrations, calibration drift, and the sensor's non-linear response are documented.