Online measurement of nanoparticle size distribution in flowing Brownian motion system using laser diode self-mixing interferometry

摘要

Laser diode self-mixing interferometry, which is characterized by self-alignment, compactness, low cost and few additional optical elements required, is promising to be applied to the online measurement of the particle size distribution in a flowing Brownian motion system. In this paper, the online measurement is realized by the laser diode self-mixing interferometry with a quick signal processing technique and a quick inversion algorithm. The total power spectrum of the self-mixing signal is achieved, and the impact of particle motions on the total power spectrum is researched. A method is proposed for retrieving the particle size distribution, which is validated by experimental tests.