New diagnostic methods for laser plasma- and microwave-enhanced combustion

Richard B. Miles, James B. Michael, Christopher M. Limbach, Sean D. McGuire, Tat Loon Chng, Matthew R. Edwards, Nicholas J. Deluca, Mikhail N. Shneider, Arthur Dogariu

Research output: Contribution to journalReview articlepeer-review

19 Scopus citations


The study of pulsed laser- and microwaveinduced plasma interactions with atmospheric and higher pressure combusting gases requires rapid diagnostic methods that are capable of determining the mechanisms by which these interactions are taking place. New rapid diagnostics are presented here extending the capabilities of Rayleigh and Thomson scattering and resonance-enhanced multi-photon ionization (REMPI) detection and introducing femtosecond laser-induced velocity and temperature profile imaging. Spectrally filtered Rayleigh scattering provides a method for the planar imaging of temperature fields for constant pressure interactions and line imaging of velocity, temperature and density profiles. Depolarization of Rayleigh scattering provides a measure of the dissociation fraction, and multi-wavelength line imaging enables the separation of Thomson scattering from Rayleigh scattering. Radar REMPI takes advantage of highfrequency microwave scattering from the region of laser-selected species ionization to extend REMPI to atmospheric pressures and implement it as a stand-off detection method for atomic and molecular species in combusting environments. Femtosecond laser electronic excitation tagging (FLEET) generates highly excited molecular species and dissociation through the focal zone of the laser. The prompt fluorescence from excited molecular species yields temperature profiles, and the delayed fluorescence from recombining atomic fragments yields velocity profiles.

Original languageEnglish (US)
Article number20140338
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2048
StatePublished - Aug 13 2015

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy
  • General Mathematics


  • Depolarized rayleigh scattering
  • Femtosecond laser electronic excitation tagging
  • Filtered Rayleigh scattering
  • Radar resonance-enhanced multi-photon ionization
  • Thomson scattering


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