Velocity Determination by Measurement of the Doppler Shift of a Spectral Line

Abstract

Measurement of gas velocity in a high enthalpy, arc-heated facility has usually been inferentially derived. The ability to measure a directly related quantity, the shift in frequency of an emitting spectral line, enables the velocity to be obtained in a noninteracting manner. The theory concerning the line shape and other inversion requirements is discussed. Three mathematical techniques for separating the lines are discussed and examples of each are given. Furthermore, the results of an Abel inversion are obtained. The test apparatus which consists of the high velocity arc source, optics, spectrometer, and either a photographic plate or electro-optical readout is described, and experimental results are presented.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1972
Accession Number
AD0740549

Entities

People

  • E. D. Tidwell
  • H. T. Bentley Iii
  • V. A. Cline

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Data Acquisition
  • Data Reduction
  • Diffraction
  • Doppler Effect
  • Frequency
  • Inversion
  • Measurement
  • Photographic Plates
  • Photography
  • Photomultiplier Tubes
  • Power Supplies
  • Radiation
  • Spectra
  • Spectral Lines
  • Spectrometers

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Fluid Dynamics.
  • Optical Physics and Photonics.