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开发一个便携式气溶收集器和光谱仪 (PACS)
Changjie Cai1, Geb W Thomas2, Tianbao Yang3
1Department of Occupational and Environmental Health, University of Oklahoma Health Sciences Center, University of Oklahoma, Oklahoma City, Oklahoma, USA.
概括
开发了一种新的便携式气溶收集器和光谱仪 (PACS),用于测量空气中的颗粒度. 这个仪器准确地评估了粒子的大小,数量,表面积和质量,有助于气溶研究.
科学领域:
- 大气科学 大气科学
- 环境监测 环境监测
- 发展工具发展工具
背景情况:
- 准确地描述空气中的气溶对于了解气候,空气质量和健康影响至关重要.
- 现有的方法往往缺乏在广泛的尺寸范围内同时,连续测量多个气溶属性的能力.
- 需要便携式仪器来进行多功能气溶采样和分析.
研究的目的:
- 开发和验证一个便携式气溶收集器和光谱仪 (PACS),用于全面的空气气溶表征.
- 为了使粒子数,表面积和质量度从10nm到10μm的连续测量.
- 为了促进收集的气溶样本的同时化学分析.
主要方法:
- PACS仪器集成了六阶段的粒子大小选择器 (冲击器和扩散阶段),数量度的凝结粒子计数器和质量度的光度计.
- 每个阶段的粒子透率和收集效率都经过实验确定.
- 使用适应性网格搜索和受约束的线性最小平方拟合的数据反转算法被用来确定气溶尺寸分布.
主要成果:
- 该PACS证明了有效的颗粒大小选择,测量了50%的切断直径与设计规格密切匹配.
- 跨阶段的低压下降允许使用便携式空气进行操作.
- 该仪器在气溶尺寸分布上取得了良好的一致性,在假设标准密度球体时,R2值从0.90到1.00不等.
- 装配的数量和质量度偏差保持在±10%,尽管粒子密度和形状的变化.
结论:
- 开发的便携式气溶收集器和光谱仪 (PACS) 是一种新型仪器,能够同时通过数量,表面积和质量来评估空气中的气溶成分和度.
- PACS提供了一种多功能和便携式解决方案,用于在广泛的尺寸范围内进行详细的气溶表征.
- 对于数量和质量度测量的粒子密度和形状的不确定性,仪器的性能是稳定的.
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