Fiber-optic particle sizer based on multi-spectral scattering

Abstract

In-situ and real-time particle size measurements are necessary in many industrial fields, such as real-time monitoring of particle manufacturing process and intermediate process analysis of chemical reactions. Currently, most of the traditional laser particle size analyzers are bulky, not suitable for in-situ measurement in narrow space. Fiber-optic particle size analyzers based on white-light scattering usually have a slow detection rate and cannot meet the needs of real-time measurement. In this report, a fiber-optic particle sizer based on multi-spectral scattering for in-situ rapid measurement of particle size distribution is proposed. The particle size distribution is measured by a variety of light sources with different spectra based on the Mie scattering theory. We theoretically analyzed the feasibility of this technology and demonstrated in polystyrene microsphere suspensions. The results show that the fiber-optic particle sizer can achieve a measurement accuracy of 0.5μm in the measurement range of 3-15μm, with the measurement speed of 1kHz.