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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1850–1858

Arcjet flow properties determined from laser-induced fluorescence of atomic nitrogen

Douglas G. Fletcher  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1850-1858 (1999)
http://dx.doi.org/10.1364/AO.38.001850


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Abstract

Flow property measurements that were recently acquired in the Ames Research Center Aerodynamic Heating Facility arcjet using two-photon laser-induced fluorescence (LIF) of atomic nitrogen (N) are reported. The flow properties, which include velocity, translational temperature, and N concentration, were measured simultaneously over a range of facility operating conditions for N2–argon test gas flows in the 30-cm-diameter nozzle. A recent measurement of the two-photon excitation cross section for the 3p4D° ← 2p4S° transition of atomic nitrogen is used to convert the relative nitrogen concentration measurements to absolute values, and a nitrogen flow reactor is used to provide a room-temperature, reference-wavelength calibration of the translational temperature and velocity measurements. When combined with information from facility measurements, an analysis of the flow properties obtained using two-photon LIF of N yields the total free-stream flow enthalpy.

© 1999 Optical Society of America

OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(020.4180) Atomic and molecular physics : Multiphoton processes
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7250) Remote sensing and sensors : Velocimetry
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

History
Original Manuscript: August 18, 1998
Revised Manuscript: December 2, 1998
Published: March 20, 1999

Citation
Douglas G. Fletcher, "Arcjet flow properties determined from laser-induced fluorescence of atomic nitrogen," Appl. Opt. 38, 1850-1858 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1850

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