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Optical Engineering

Estimation of particle trajectory effects and their reduction using polarization in phase Doppler particle measurements
Author(s): Naomichi Yokoi; Yoshihisa Aizu; Hiromichi Mishina
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Paper Abstract

Phase Doppler methods that measure the diameter of moving spherical particles are sensitive to particle trajectory effects that cause a phase error under Gaussian beam illumination. This error results from the interference between reflected and refracted rays from the particle. We first numerically estimate the particle trajectory effect using the geometrical optics approximation and the generalized Lorenz-Mie theory (GLMT) and, then, discuss the optimum measurement conditions that minimize the phase error. We next theoretically and experimentally investigate a method for reducing the trajectory effect using the separation of reflected and refracted rays on the basis of the polarization change. Experimental results show the usefulness of this method.

Paper Details

Date Published: 1 November 1999
PDF: 14 pages
Opt. Eng. 38(11) doi: 10.1117/1.602238
Published in: Optical Engineering Volume 38, Issue 11
Show Author Affiliations
Naomichi Yokoi, Muroran Institute of Technology (Japan)
Yoshihisa Aizu, Muroran Institute of Technology (Japan)
Hiromichi Mishina, Muroran Institute of Technology (Japan)

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