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Phase‐Doppler Anemometry with the Dual Burst Technique for measurement of refractive index and absorption coefficient simultaneously with size and velocity
Author(s) -
Onofri Fabrice,
Girasole Thierry,
Gréhan Gérard,
Gouesbet Gérard,
Brenn Günter,
Domnick Joachim,
Xu TianHua,
Tropea Cameron
Publication year - 1996
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.19960130209
Subject(s) - refractive index , optics , mie scattering , doppler effect , scattering , phase (matter) , absorption (acoustics) , attenuation coefficient , particle (ecology) , light scattering , intensity (physics) , phase velocity , physics , materials science , oceanography , quantum mechanics , astronomy , geology
The principle of the dual burst technique (DBT) based on phase‐Doppler anemometry (PDA) is proposed for simultaneous particle refractive index, size and velocity measurements. This technique used the trajectory effects in PDA systems to separate the two contributions of the different scattering processes. In the case of forward scattering and refracting particles, it is shown that from the phase of the reflected contribution, the particle diameter can be deduced, whereas from the refracted contribution the particle refractive index and velocity can be obtained. Furthermore, the intensity ratio of these two scattering processes can be used for absorption measurements. Simulations based on generalized Lorenz‐Mie theory and experimental tests using monodispersed droplets of different refractive indices and absorption coefficients have validated this technique.