DESIGN CONSIDERATIONS FOR A 3-D LASER DOPPLER VELOCIMETER FOR STUDYING GRAVITY WAVES IN SHALLOW WATER

A laser velocimeter system using three frequency-modulated light beams and one detector for measurement of the instantaneous velocity vector in reversing flow is considered. An analysis of the scattering and detection processes by means of the Mie and optical mixing theories is outlined. A system proposed for gravity wave studies uses an argon-ion laser and three Bragg cells as a source and a photomultiplier detector of the light backscattered from 0.2 micrometer-diameter spheres, introduced into the flow in a low concentration, and can measure local velocity vectors of magnitude between 0.1 m/sec and 3.0 m/sec, with turbulent fluctuations of 1% or greater intensity. (Author)

• Supplemental Notes:
  • Originally published in Applied Optics, Vol. 12 No. 2, pp 294-300, Feb. 1973.
• Corporate Authors:

  Army Coastal Engineering Research Center

  5201 Little Falls Road, NW
  Washington, DC  United States  20016
• Authors:
  • Hallermeier, R J
• Publication Date: 1972-2

Media Info

• Pagination: 7 p.

Subject/Index Terms

• TRT Terms: Design; Doppler navigation; Flow visualization; Flowmeters; Gravity waves; Laser velocimeters; Lasers; Light scattering; Ocean waves; Velocimeters; Velocity measurement
• Uncontrolled Terms: Gas lasers; Shallow water
• Old TRIS Terms: A; Argon lasers; Doppler system
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00051066
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: CERC-Reprint-6-73
• Files: TRIS
• Created Date: Feb 28 1974 12:00AM