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Feasibility of Extending Rainbow Refractometry to Small Particles Using Femtosecond Laser Pulses
Author(s) -
Bakic Saša,
Xu Feng,
Damaschke Nils,
Tropea Cameron
Publication year - 2009
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.200700033
Subject(s) - refractometry , mie scattering , optics , rainbow , refractive index , femtosecond , scattering , forward scatter , light scattering , laser , physics , materials science
Rainbow refractometry has been investigated numerically for small droplets under ultrashort pulse illumination. Using Fourier Lorenz–Mie Theory, local maxima of the scattering function were investigated as a function of the scattering angle, particle size and refractive index. The primary rainbow was shown to be detectable for pulse lengths as short as 10 fs and free of interferences with other scattering orders for droplet diameters down to 5 μm. An extension of the Generalized Lorenz–Mie Theory was used to obtain an estimation of the influence of nonsphericity on refractive index detection. Overall, the possibility of improved in situ temperature measurements with Rainbow refractometry for small particles was shown to be feasible.