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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第1期    总第257期    2016年1月

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文章编号:1672-7207(2016)01-0290-08
基于CCD的粉尘质量浓度光散射测量系统
张宸瑜1,李舒2,许传龙1,王式民1

(1. 能源热转换及其过程测控教育部重点实验室,东南大学能源与环境学院,江苏南京,210096;
2. 南京市计量监督检测院科技发展部,江苏南京,210037
)

摘 要: 针对散射积分法测量粉尘颗粒质量浓度时,测量系统并不能满足角度积分上限为π和角度下限为0的固有缺陷,基于Mie理论数值计算散射光强的角分布,进而对质量浓度测量误差进行分析。利用电荷耦合元件(charge-coupled device, CCD)的高灵敏度、低噪声、线性度好等优点,研究并搭建一种基于CCD的光散射颗粒质量浓度测量系统,并通过已知孔径的小孔对CCD测量系统的角度分辨率和放大率进行校正,测试CCD的灵敏度及线性度。最后,利用已知粒径和质量浓度的样品对测量系统的准确性进行试验研究。研究结果表明:当散射角积分为0.03°~5°时,可满足质量浓度测量需要,测量相对误差小于15%。

 

关键词: 粉尘质量浓度;CCD;散射积分法;光散射

A CCD–based measurement system fordust mass concentration through light scattering
ZHANG Chenyu1, LI Shu2, XU Chuanlong1, WANG Shimin1

1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,
School of Energy and Environment, Southeast University, Nanjing 210096, China;
2. Department of Science and Technology Development, Nanjing Institute of Measurement and Testing Technology,
Nanjing 210037, China

Abstract:The scattering integration method can be applied to measure dust mass concentration. However, the measurement system based on scattering integration method has inherent disadvantages that the upper limit of the scattering angle is less than π and the lower limit is more than zero. The measurement error of dust mass concentration was analyzed through calculating angular distribution of scattering intensity. Considering that charge-coupled device (CCD) has advantages of high sensitivity, low noise and good linearity, a CCD-based measurement system for dust mass concentration was built. The angular resolution and magnification of the measurement system were calibrated through known-size pinholes, and the sensitivity and linearity of the CCD were tested. Finally, the experiments were carried out to evaluate the measurement system through the use of the polystyrene solutions with known particle sizes and concentrations. The results show that the influence of dust particle size on dust mass concentration measurement can be ignored and the scattering angle range within 0.03°-5° is enough for the dust mass concentration measurement using the scattering integration method. The measurement relative error of dust mass concentration is less than 15%.

 

Key words: dust mass concentration; CCD; scattering integration method; light scattering

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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