%0 Journal Article
%T Droplet Characterization Based on the Simulated Secondary Rainbows
%A Wenting Wang
%A Jiayi Wang
%A Yide Zhang
%J Optics and Photonics Journal
%P 133-139
%@ 2160-889X
%D 2021
%I Scientific Research Publishing
%R 10.4236/opj.2021.116011
%X The droplet size, size distribution, refractive index, and temperature can be measured simultaneously by the rainbow technique. In the present work, the rainbow scattering diagram for a spherical droplet in the secondary rainbow region is simulated by the use of the generalized Lorenz-Mie theory. For achieving high spatial resolution in denser droplet sprays, a focused Gaussian beam is used. For droplet characterization, different inversion algorithms are investigated, which includes trough-trough (¦Èmin1 and ¦Èmin2) method and inflection-inflection (¦Èinf1 and ¦Èinf2) method. For the trough-trough algorithm, the absolute error of the refractive index is between −6.4 ¡Á 10−4 and 1.7 ¡Á 10−4, and the error of the droplet radius is only between −0.55% and 1.77%. For the inflection-inflection algorithm, the maximum absolute error of the inverted refractive index is less than −1.1 ¡Á 10−3. The error of the droplet radius is between −0.75% and 5.67%.
%K Particles Characterization
%K Rainbow Pattern
%K Generalized Lorenz-Mie Theory
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=109813