Counting and measuring micro and nano particles by using Fourier Interferometric Imaging

摘要

This paper presents a new optical approach to measure micro and nano particles suspended in liquid with a very low concentration. The interference field created by light scattered from the particles on the surface of a 2D detector is recorded. The 2D FFT of this image maps the interacting pairs of particles. Therefore, the number, the 3D relative positions and sizes of the particles can be extracted.