The intrinsic phase shift and its effect upon the measurement of air flow velocities using LITRA

Sean McGuire, Sohail Zaidi, Arthur Dogariu, Richard Miles, Chris Hovde

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

LITRA is a velocimetry technique being developed to measure flow speeds under hypersonic conditions. The technique uses a high power laser to generate ionization at a point of interest and a microwave system to track the movement of this ionization within the flow. LITRA infers velocity from the phase of the scattered microwave signal. This phase changes as the laser induced spark moves. However, additional phase shifts occur which are not associated with the velocity of the spark. These phase shifts arise from the interaction between microwaves and plasma, and they limit the accuracy of the velocity measurement. Work is being conducted to understand the causes of the intrinsic phase shift. Computational work, which models the gas dynamic evolution of a laser induced spark, is discussed. Microwave scattering measurements are presented and show the evolution of the signal amplitude and phase. Both computational and experimental results are discussed in light of shadowgraph measurements that show the spatial evolution of the laser induced spark.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624101816
DOIs
StatePublished - 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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