| Citation: | TAN Hao, XU Chuanlong, ZHANG Biao, et al. Particle size distribution measurement based on near field scattering[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(2): 381-387. doi: 10.13700/j.bh.1001-5965.2016.0110(in Chinese)
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To solve the problems such as high intensity of transmitted light, stray light interference and small scattering angle in the traditional low-angle light scattering techniques, a novel near field scattering (NFS) was adopted to derive the traditional low-angle scattering intensity. A particle size measurement system based on near filed scattering was proposed and built with the scattering angle up to 40.5°. Heterodyne method was applied to process the near field speckle images generated by interference between the transmitted and scattered fields, which is capable of completely removing the stray light. The angular intensity distribution was determined by fast Fourier transform (FFT) frequency spectral analysis of the heterodyne signal. The particle size distributions were inversed by Chahine algorithm. Experimental results on measurement of both monodisperse and bimodal samples with known diameters which are 39.2 μm and 67.3 μm, was presented. For monodisperse samples, the measurement error was less than 5%, for bimodal samples, there was two apparent peaks in 43.3 μm and 74.1 μm, the error was about 10%.
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