Retrieval of particle size distribution in multispectral region

In spectral extinction particle sizing technique, the particle size distribution (PSD) can be retrieved based on the measurement of extinction values at multiple wavelengths. If the measurement is performed at wavelengths within only a narrow spectral range, the accuracy and the antinoise ability of retrieval results will be affected to some degree. In this paper, the retrieval of PSD at multiple wavelengths in the ultraviolet-visible-infrared spectral region is proposed. The extinction efficiency calculated by the Mie theory with different wavelengths is studied, and then the retrieval of PSD in multispectral region is performed. Simulation tests both in the dependent model and in the independent model indicate that the retrieval results in the multispectral region are more stable and accurate than that of only in the visible spectrum region. The retrieval results are satisfactory in the multispectral region with the presence of 5% random noise for unimodal distribution and 3% random noise for bimodal distribution.