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Influence of the Measurement Volume on the Phase Error in Phase Doppler Anemometry . Part 2: Analysis by extension of geometrical optics to the laser beam; Refractive mode operation
Author(s) -
Albrecht HeinzE.,
Wenzel Marcus,
Borys Michael
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.19960130105
Subject(s) - optics , physics , doppler effect , phase (matter) , gaussian beam , laser , beam (structure) , laser doppler velocimetry , laser beam quality , amplitude , geometrical optics , laser beams , astronomy , medicine , blood flow , quantum mechanics
The influence of the measurement volume can be investigated by using extended geometrical optics, which is based on geometrical optics by including the amplitude and phase distribution in the laser beam. The dynamics in phase Doppler anemometry can be analysed, in addition to effects of the particle size‐dependent detection volume. Extended geometrical optics has been developed as a powerful tool to investigate these influences for each order of light scattering separately. Phase errors caused by Gaussian‐beam intensity distribution and the curvature of the wave fronts beyond the beam waist can easily be calculated. According to Part 1 (Reflective Mode Operation), the influence of the particle trajectories on measured phase and mass concentration is simulated for refractive mode operation.