Simultaneous temperature and velocity measurements in air with femtosecond laser tagging

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

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


High spatial resolution measurements of local flow velocities and temperature distributions are crucial for understanding turbulent, high-speed, and reacting flows. In this paper, we demonstrate that femtosecond laser electronic excitation tagging, a recently developed molecular tagging velocimetry method, can also be used to simultaneously measure temperature. A 150 femtosecond pulse populates excited molecular nitrogen states, driving significant emission from the nitrogen second positive and first negative systems. Spectroscopy of this emission allows temperature to be determined from the distribution of rotational molecular energy. Temperature profiles are measured with better than10% uncertainty and 500 ìmspatial resolution between 300 and 650Kin heated jets. This method is expected to be valid up to at least 2000 K. Femtosecond laser electronic excitation tagging temperature and velocity measurements involve separate nitrogen transitions and can be conducted simultaneously without interference.

Original languageEnglish (US)
Pages (from-to)2280-2288
Number of pages9
JournalAIAA journal
Issue number8
StatePublished - 2015

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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