Velocimetry by femtosecond laser electronic excitation tagging (FLEET) of air and nitrogen

James B. Michael, Matthew R. Edwards, Arthur Dogariu, Richard B. Miles

Research output: Contribution to conferencePaper

9 Scopus citations

Abstract

Supersonic air speeds are measured using femtosecond laser tagging of molecular nitrogen in unseeded air and in pure nitrogen by monitoring fluorescent emission with a time-delayed, fast-gated camera. Single and multiple lines are written in air by focusing a 120 fs, 1.2 mJ, 810 nm laser and relying on nonlinear nitrogen excitation and dissociation, and subsequent recombination resulting in fluorescent emission in the narrow focal region. The emission occurs in the spectral window from 560 to 660 nm corresponding to the first positive nitrogen emission (or nitrogen afterglow). The fluorescence mechanism is outlined and the accuracy of the technique is assessed through measurements in a small supersonic air jet.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 2012
Event50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States
Duration: Jan 9 2012Jan 12 2012

Other

Other50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityNashville, TN
Period1/9/121/12/12

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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    Michael, J. B., Edwards, M. R., Dogariu, A., & Miles, R. B. (2012). Velocimetry by femtosecond laser electronic excitation tagging (FLEET) of air and nitrogen. Paper presented at 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Nashville, TN, United States. https://doi.org/10.2514/6.2012-1053