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Title: Air resonance enhanced multiphoton ionization tagging velocimetry

Journal Article · · Applied Optics
DOI:https://doi.org/10.1364/AO.455216· OSTI ID:1864386

Air resonance enhanced multiphoton ionization (REMPI) tagging velocimetry (ART) was demonstrated in quiescent and supersonic flows. The ART velocimetry method utilizes a wavelength tunable laser beam to resonantly ionize molecular oxygen in air and generate additional avalanche-type ionization of molecular nitrogen. The fluorescence emissions from the first negative and first positive bands of molecular nitrogen are, thus, produced and used for flow tagging. Detailed characterization of ART was conducted, including the effects of oxygen resonance to fluoresce nitrogen, nitrogen fluorescence spectrum, laser energy deposition into quiescent flow showing minimal perturbations in flow, fluorescence lifetime study at various pressures, and line tagging without breakdown. Pointwise velocity measurements within a supersonic flow from a nominal Mach 1.5 nozzle have been conducted and characterized.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0021382
OSTI ID:
1864386
Journal Information:
Applied Optics, Journal Name: Applied Optics Vol. 61 Journal Issue: 13; ISSN 1559-128X
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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