Simultaneous Velocimetry and Thermometry of Air Using Nonresonant Heterodyned Laser-induced Thermal Acoustics

Abstract

Non-resonant laser-induced thermal acoustics (LITA) is employed with heterodyne detection to measure temperature (285-295 K) and a single component of velocity (20-150 m/s) in an atmospheric pressure, subsonic, unseeded air jet. Good agreement is found with pitot-tube measurements of velocity (0.2% at 150 m/s and 2% at 20 m/s) and the isentropic expansion model for temperature (0.3%).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 2000
Accession Number
ADA377215

Entities

People

  • G. C. Herring
  • R. J. Balla
  • Roger C. Hart

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Barometric Pressure
  • Correlation Techniques
  • Doppler Effect
  • Engineering
  • Flow
  • Fluid Flow
  • Frequency
  • Local Oscillators
  • Mach Number
  • Measurement
  • Pitot Tubes
  • Sound Waves
  • Wave Packets
  • Waves

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy