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The Proceedings Fifth International Conference on Numerical Ship Hydrodynamics (1990) / Chapter Skim
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Automatic Particle-Image Velocimetry Utilizing Laser-Induced Fluorescent Particles
Pages 493-498

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From page 493...
... who utilized digital image processing techniques to automatically analyze particle streak images and produce full-field velocity maps. The primary factors affecting the capability to adapt particle displacement velocimetry to large scale complex flows are the ability to handle large amounts of data, the required processing time, variations in velocity scales in the same flow field, the capability to record and identify fine details in large scale images as well as the availability of the appropriate particle tracers in large quantities.
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From page 494...
... , neutrally buoyant particles, containing imbedded fluorescing dyes. These particles were invisible in most of the flow field, but responded with intense spontaneous fluorescence within the illuminated section.
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From page 495...
... The technique consists of illuminating a section of the flow field with a sheet of Argon ion laser while seeding the water with microscopic fluorescing neutrally buoyant particles. These tracers are invisible in most of the flow field, but respond with intense fluorescence within the illuminated section.
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From page 496...
... towing tank at the David Taylor Research Center. ~ ~ ~ Laser beam modulation , , , 496 Pa rti cl e t race Figure 2: Incident illumination modulation code with a typical pair of traces of the same particle.
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From page 497...
... but magnified prior to digitization. Figure 4: Typical double exposed image of the flow near a 1 inch diameter nozzle.
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From page 498...
... ~ ~ ~~ ~~.~ ~~ I.... ~~ ~ Figure 9: Map of the velocity field of the flow near a 1 inch nozzle, determined through analysis of Figure 7, by digital image processing.
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Key Terms

  • image processing
  • flow field
  • illumination code
  • flow visualization
  • digital image

  • image analysis
  • towing tank
  • turbulent flows
  • bit map
  • taylor research

  • particle traces
  • david taylor
  • entire image
  • velocity field
  • flow near

  • scale flow
  • neutrally buoyant
  • processing time
  • buoyant particles
  • scale complex

  • visualization facility
  • laser sheet
  • argon ion
  • velocity maps
  • trailing periscope

  • ion laser
  • specific illumination
  • binary bit
  • particle streak
  • particle trace


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