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Forward Scattering Signature of a Spherical Particle Crossing a Laser Beam out of the Beam Waist
Author(s) -
Chevaillier JeanPhilippe,
Fabre Jean,
Hamelin Patrice,
Lense JeanLoup
Publication year - 1988
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.19880050103
Subject(s) - optics , attenuation , beam (structure) , physics , diffraction , range (aeronautics) , laser beam quality , laser , particle (ecology) , sizing , scattering , doppler effect , beam diameter , particle beam , laser beams , materials science , chemistry , geology , oceanography , organic chemistry , astronomy , composite material
When a particle crosses a laser beam out of the focal plane, the light attenuation signal occuring on the beam axis contains some information regarding the particle size and trajectory. These attenuation signatures are analysed and predicted with a simplified model based on Fraunhofer diffraction. Numerical and experimental results are found to be in good agreement. A modified laser Doppler velocimeter using this sizing method is able to perform simulataneous measurement of size and velocity of spherical particle in the range 10 μm–500 μm.