Shadow Doppler technique for sizing particles of arbitrary shape

Y. Hardalupas, K. Hishida, M. Maeda, H. Morikita, A. M.K.P. Taylor, J. H. Whitelaw

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


The output from a linear diode array is used in a modified laser Doppler velocimeter to measure the size and shape of irregular particles. The sizing accuracy for transparent and opaque particles between 30 and 140, um is better than 10%. The inaccuracy caused by trajectories that lay at angles of less than 240 to the axis of the array was less than ±5%, and a further inaccuracy of ±5% was caused by defocusing of the particle from the center of the velocimeter measuring volume by up to ±500 µm. The advantages of the shadow Doppler technique over other techniques for sizing irregular particles, such as amplitude systems with pointer volumes, are that the shadow Doppler technique records shape, the optical arrangement is more robust, less precise alignment is required, and the equipment can be constructed at low cost.

Original languageEnglish
Pages (from-to)8417-8426
Number of pages10
JournalApplied Optics
Issue number36
Publication statusPublished - 1994 Dec 20
Externally publishedYes


  • Irregular particle sizing
  • Laser Doppler velocimetry
  • Particle imaging

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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