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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 7 — Mar. 1, 2001
  • pp: 1049–1064

Unidirectional phase-Doppler method for particle-size measurements

Naomichi Yokoi, Yoshihisa Aizu, and Hiromichi Mishina  »View Author Affiliations


Applied Optics, Vol. 40, Issue 7, pp. 1049-1064 (2001)
http://dx.doi.org/10.1364/AO.40.001049


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Abstract

We propose what we believe to be a novel unidirectional phase-Doppler method for sizing moving spherical particles on the basis of the phase difference of two polarized Doppler beat signals in a single scattering direction. Light scattered by a moving particle is divided into two rays, which are detected with different polarization angles to transmit dominantly reflected or refracted rays. The phase difference between two signals is linearly proportional to the particle diameter with a given particle refractive index and geometrical parameters of the optical system. To explore the optimum polarization condition, we numerically investigated the phase–diameter properties in relation to polarization angles by using the geometrical optics approximation and generalized Lorenz–Mie theory. We also performed experiments with polystyrene and glass particles to verify the usefulness of the proposed method.

© 2001 Optical Society of America

OCIS Codes
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(260.5430) Physical optics : Polarization
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry
(290.5850) Scattering : Scattering, particles

Citation
Naomichi Yokoi, Yoshihisa Aizu, and Hiromichi Mishina, "Unidirectional phase-Doppler method for particle-size measurements," Appl. Opt. 40, 1049-1064 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-7-1049

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