Frequency Broadening in Reference Beam Laser Doppler Velocimeter Data

Abstract

The laser Doppler velocimeter (LDV) provides velocity data in the form of a frequency spectrum. Because of the inherent optical geometry of the laser velocimeter and the effects of light scattering particles passing through the probe volume, a frequency distribution density function representing these combined effects is found in the readout device. Hence, interpretation of data must be effected for frequency-to-velocity conversion. This report deals with this frequency broadening effect associated with the LDV reference beam type. Six frequency broadening effects are discussed in terms of their magnitude and relative importance.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1971
Accession Number
AD0730272

Entities

People

  • W. H. Goethert

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Brownian Motion
  • Diffraction
  • Diffusion Coefficient
  • Doppler Effect
  • Fluid Flow
  • Frequency
  • Frequency Domain
  • Frequency Modulation
  • Laser Beams
  • Light Scattering
  • Power Spectra
  • Scattering
  • Spectra
  • Spectrum Analyzers
  • Velocimeters

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Optical Physics and Photonics.
  • Systems Analysis and Design

Technology Areas

  • Directed Energy