Femtosecond Laser Electronic Excitation Tagging (FLEET)for imaging flow structure in unseeded hot or cold air or nitrogen

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

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

15 Scopus citations

Abstract

A one millijoule, 150 femtosecond laser focused into either air or nitrogen dissociates nitrogen molecules along a line through the focal region, and the atomic nitrogen fragments emit light as they recombine. This emission lasts for tens of microseconds and allows the displaced line to be imaged with a time gated camera. Displacement and resolution can be measured to tens of microns. The images provide quantitative measurement of instantaneous velocity profiles and turbulent structure. Very little energy is deposited, so there is negligible flow perturbation, and the laser can be refocused through the volume to write multiple lines or patterns. Measurements in air range from several Torr to several atmospheres and from 100K to 2000K.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 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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    Miles, R. B., Edwards, M. R., Michael, J. B., Calvert, N. D., & Dogariu, A. (2013). Femtosecond Laser Electronic Excitation Tagging (FLEET)for imaging flow structure in unseeded hot or cold air or nitrogen. In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 (51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013).