Open AccessDetermination of the orientation of transparent spheroids using interference technology
Author(s) -
Jinlu Sun,
Hongxia Zhang,
Xiaolei Wang,
Dagong Jia,
Tiegen Liu,
Mengran Zhai
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.014097
Subject(s) - focus (optics) , optics , orientation (vector space) , speckle pattern , particle (ecology) , interference (communication) , perpendicular , physics , interferometry , computer science , geometry , mathematics , geology , computer network , channel (broadcasting) , oceanography
The distribution of light scattered by a spheroidal particle is sensitive to the orientation of the particle. Based on interference technology, we present a method for obtaining the orientation of the spheroidal particle from in-focus and out-of-focus images. We simulate the in-focus images using the LightTools. From the optical transfer matrix theory, we obtain both the in-focus and corresponding out-of-focus images using Matlab. We find that the glare-point distribution of the in-focus image exhibits axial symmetry for a spheroidal particle and that it is perpendicular to the speckle orientation of the out-of-focus image. We establish an interferometric particle imaging system to experimentally acquire the out-of-focus and in-focus images of the transparent spheroidal particles. The experimental results agree with the simulations. We are thus able to propose a method for obtaining the orientation of a spheroidal particle using either the in-focus image or out-of-focus image. The method has potential applications in particle measurements.