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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 25761–25771

Optical caustics associated with the primary rainbow of oblate droplets: simulation and application in non-sphericity measurement

Haitao Yu, Feng Xu, and Cameron Tropea  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 25761-25771 (2013)

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A vector ray tracing (VRT) model is developed to simulate optical caustic structures in the primary rainbow region of light scattering from oblate droplets. The changes of the optical caustic structures in response to shape deformation of oblate droplets are investigated. Then the curvature calculated from the simulated rainbow fringes is compared with that from the measured rainbow fringes and good agreement is found. Furthermore, according to the generalized rainbow patterns and the relation between aspect ratio and curvature of the rainbow fringe, non-sphericities in terms of aspect ratio of an oblate water droplet is measured with high measurement accuracy.

© 2013 Optical Society of America

OCIS Codes
(290.5850) Scattering : Scattering, particles
(290.5825) Scattering : Scattering theory

ToC Category:

Original Manuscript: June 13, 2013
Revised Manuscript: August 20, 2013
Manuscript Accepted: September 26, 2013
Published: October 22, 2013

Haitao Yu, Feng Xu, and Cameron Tropea, "Optical caustics associated with the primary rainbow of oblate droplets: simulation and application in non-sphericity measurement," Opt. Express 21, 25761-25771 (2013)

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