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上海理工大学 光电信息与计算机工程学院 上海,200093
收稿日期:2011-04-19,
修回日期:2011-05-26,
网络出版日期:2011-12-25,
纸质出版日期:2011-12-25
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隋国荣, 程利, 陈抱雪. 用光纤耦合法实现颗粒测量[J]. 光学精密工程, 2011,19(12): 2844-2853
SUI Guo-rong, CHENG Li, CHEN Bao-xue. Measurement of particles by optical fiber coupling[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2844-2853
隋国荣, 程利, 陈抱雪. 用光纤耦合法实现颗粒测量[J]. 光学精密工程, 2011,19(12): 2844-2853 DOI: 10.3788/OPE.20111912.2844.
SUI Guo-rong, CHENG Li, CHEN Bao-xue. Measurement of particles by optical fiber coupling[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2844-2853 DOI: 10.3788/OPE.20111912.2844.
根据全光散射法测量粒径存在样品池壁散射及折射率改变等问题
提出了利用光纤耦合结构
并引入洛伦兹经典色散公式和多波长处理方法来实现颗粒测试。首先
介绍了全光散射法进行颗粒测试的理论
并研究现有的样品池和测量手段存在的问题。然后
引入洛伦兹色散公式来处理折射率的变化;同时结合多波长处理法
获得颗粒的平均粒径和粒径分布公式
建立目标函数并利用遗传算法进行参数反演;通过光纤端面的耦合结构构造样品池
利用光谱仪对夹在光纤端面间的待测液进行多波长扫描。最后
试制了实际测试系统
通过计算机内部算法
完成颗粒测试。仿真和实验结果表明
该方法可以在折射率未知的情况下较准确地反演出颗粒的平均粒径及其粒径分布;对测量光谱加入2%的随机噪声后
其平均粒径及折射率的反演误差低于1%
粒径分布的反演误差低于5%
可以满足国标对均值误差和重复性误差的要求。
By using an optical fiber coupling structure
a new particle measuring method through introducing Lorentz classic dispersion formula and multi-wavelength processing was proposed to amend the scattering influence of a sample cell wall and the change of the refractive index. Firstly
the theory of total light scattering for the particle measurement was introduced
and the problems existied in the sample cell and measurement method were studied. Then
the Lorentz dispersion formula was introduced to process the refractive index changes caused by dispersion and the multi-wave length processing was taken to obtain the average particle size and particle size distribution. By establishing an object function
a method based on the genetic algorithm was proposed to implement the inversion of particle refractive index. A new sample cell was designed and manufactured with the end face coupling of optical fiber
and the particle sample dripping placed the end face between two optical fibers was scanned by a spectrometer in multi-wavelengths.Finally
through the algorithm of the computer
the average particle size and particle size distribution were measured. The simulation and experiment result indicates that the average particle size and particle size distribution can be well determined by this method in the case of unknown refractive index.Furthermore
this method has advantages of reliability and stability. When a 2% random noise was put in the transmission extinction measurement values at two wavelengths
the inversion errors of average particle size and refraction index are less than 1% and that of the particle size distribution is less than 5%. It can meet the needs of national standard for mean errors and repeatability errors.
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