EFFECT OF DOPPLER AMBIGUITY ON THE MEASUREMENT OF TURBULENCE SPECTRA BY LASER DOPPLER VELOCIMETER

For the measurement of turbulent flows, the effect of finite transit times of scatterers to cross the scattering region in a laser Doppler velocimeter is discussed. The result shows that in the measurement of the velocity spectrum it is equivalent to a white spectrum noise with an amplitude inversely proportional to the average transit time. Theoretically, the noise becomes negligibly small when the wavelength of the laser light becomes very short. (Author)

• Supplemental Notes:
  • Revision of report dated 2 November 1972. Also available in Applied Physics Letters, V22 N4, pp 154-156, 15 February 1973.
• Corporate Authors:

  University of California, La Jolla

  Institute for Pure and Applied Physical Sciences
  San Diego, CA  United States 
• Authors:
  • Wang, C P
• Publication Date: 1972-12-4

Media Info

• Pagination: 3 p.

Subject/Index Terms

• TRT Terms: Flowmeters; Power spectra; Probes (Measuring devices); Spectrum analysis; Turbulence; Velocimeters
• Old TRIS Terms: Turbulence probes
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00044667
• Record Type: Publication
• Source Agency: National Technical Information Service
• Contract Numbers: DAHC04-72-C-0037
• Files: TRIS
• Created Date: Jul 31 1973 12:00AM