Application of Top-Hat Laser Beam to Particle Sizing in LDV System

  • Masanobu Maeda
  • Kouichi Hishida


Efforts have been made to obtain information on mixing to relate with ignition in the peripheral region of spray jets with clouds dilute enough to be measured by an laser Doppler velocimeter system. Investigators have attempted simultaneous size measurements within the same optical system, or combined with another light source, by Mie-scatter intensity, Doppler visibility or Doppler phase difference [1–11]. The authors have investigated heat transfer in two-phase mist flows and analyzed flow behaviour and the variation of droplet size distribution in boundary layers with a two-beam LDV system [12,13]. The LDV system with particle sizing proposed previously [14,15] has worked enough in detecting the scatter intensity with discrimination of the particle paths in the measuring volume. However, the electronic circuits had to be more sophisticated, and the ambiguity of size estimation can not be avoided in highly turbulent flows.


Spatial Filter Droplet Size Distribution Particle Path Light Scatter Intensity Green Beam 
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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • Masanobu Maeda
    • 1
  • Kouichi Hishida
    • 1
  1. 1.Department of Mechanical EngineeringKeio UniversityKohoku-ku YokohamaJapan

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