| 光谱学与光谱分析 |
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| Analysis of Visible Extinction Spectrum of Particle System and Selection of Optimal Wavelength |
| SUN Xiao-gang,TANG Hong,YUAN Gui-bin |
| Harbin Institute of Technology,Harbin 150001, China |
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Abstract In the total light scattering particle sizing technique, the extinction spectrum of particle system contains some information about the particle size and refractive index. The visible extinction spectra of the common monomodal and biomodal R-R particle size distribution were computed, and the variation in the visible extinction spectrum with the particle size and refractive index was analyzed. The corresponding wavelengths were selected as the measurement wavelengths at which the second order differential extinction spectrum was discontinuous. Furthermore, the minimum and the maximum wavelengths in the visible region were also selected as the measurement wavelengths. The genetic algorithm was used as the inversion method under the dependent model. The computer simulation and experiments illustrate that it is feasible to make an analysis of the extinction spectrum and use this selection method of the optimal wavelength in the total light scattering particle sizing. The rough contour of the particle size distribution can be determined after the analysis of visible extinction spectrum, so the search range of the particle size parameter is reduced in the optimal algorithm, and then a more accurate inversion result can be obtained using the selection method. The inversion results of monomodal and biomodal distribution are all still satisfactory when 1% stochastic noise is put in the transmission extinction measurement values.
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Received: 2007-05-10
Accepted: 2007-08-20
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Corresponding Authors:
SUN Xiao-gang
E-mail: tangbenben@126.com
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SUN Xiao-gang, TANG Hong, DAI Jing-min. Research on the Measurement Range of Particle Size with Total Light Scattering Method in Vis-IR Region[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(12): 2793-2798. |
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SUN Xiao-gang,TANG Hong,YUAN Gui-bin. Study of Inversion and Classification of Particle Size Distribution under Dependent Model Algorithm[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(05): 1111-1114. |
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