An Application of Laser-Raman-Spectroscopy to Thermochemical Measurements in an Arc-Heated Wind Tunnel Flow

Abstract

Laser Raman Scattering (LRS) has been investigated as a possible approach toward providing a nonperturbing flow calibration method for arc-heated wind tunnel facilities. Such a calibration is needed to evaluate the chemical and thermodynamic properties of the high temperature air flow which cannot be accurately determined using standard probe techniques. Theoretical calculations showed that the number densities and vibrational temperatures of nitrogen, oxygen, and nitric oxide could be obtained using the Raman spectroscopic method. Exploratory experimental LRS results obtained in the Air Force Flight Dynamics Laboratory 50-Megawatt Reentry Nose Tip (RENT) Facility showed that it is indeed feasible to apply LRS to arch-tunnel flow diagnostics.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1972
Accession Number
AD0761500

Entities

People

  • Anthony A. Boiarski
  • Fred L. Daum

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Electromagnetic Radiation
  • Fluid Dynamics
  • Frequency Shift
  • Laser Beams
  • Light (Electromagnetic Radiation)
  • Light Sources
  • Measurement
  • Optical Properties
  • Optics
  • Quantum Efficiency
  • Raman Spectroscopy
  • Scattering
  • Spectra
  • Spectroscopy
  • Test Facilities
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.
  • Marksmanship and Weaponry.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers