scholarly journals Time-resolved laser-induced fluorescence measurement of ion and neutral dynamics in a Hall thruster during ionization oscillations

2015 ◽  
Vol 118 (23) ◽  
pp. 233301 ◽  
Author(s):  
Andrea Lucca Fabris ◽  
Christopher V. Young ◽  
Mark A. Cappelli
Keyword(s):  
Laser Induced Fluorescence ◽  
Hall Thruster ◽  
Fluorescence Measurement ◽  
Time Resolved

Time-resolved ion velocity measurements in a high-power Hall thruster using laser-induced fluorescence with transfer function averaging

2020 ◽  
Vol 116 (23) ◽  
pp. 234107 ◽  
Author(s):  
V. H. Chaplin ◽  
R. B. Lobbia ◽  
A. Lopez Ortega ◽  
I. G. Mikellides ◽  
R. R. Hofer ◽  
...  
Keyword(s):  
Transfer Function ◽  
High Power ◽  
Laser Induced Fluorescence ◽  
Hall Thruster ◽  
Velocity Measurements ◽  
Time Resolved ◽  
Ion Velocity

Measurements of the Collisionally Quenched Lifetime of CO in Hydrocarbon Flames

1994 ◽  
Vol 48 (9) ◽  
pp. 1118-1124 ◽  
Author(s):  
Sara Agrup ◽  
Marcus Aldén
Keyword(s):  
Laser Induced Fluorescence ◽  
Polyaromatic Hydrocarbon ◽  
Time Decay ◽  
Collisional Quenching ◽  
Time Resolved ◽  
Hydrocarbon Flames ◽  
Effective Lifetime ◽  
Ethylene Flame ◽  
Oxygen Flame ◽  
Different Parts

Time-resolved laser-induced fluorescence (LIF) from CO molecules in hydrocarbon flames was studied. Collisional quenching constants were evaluated on the basis of the exponential decays. Effective lifetime in a methane/oxygen flame was observed to vary between 250 and 400 ps depending on the position within the flame, and from 400 to 600 ps in the non-sooty parts of an ethylene/air flame. Fluorescence, constituting simultaneous spatially and temporally resolved decays, was also registered from various sections along a laser beam that probed different parts of the flame. Spectral recordings revealed not only the expected CO peaks but also, in the ethylene flame, laser-induced emission from C2 Swan bands and from polyaromatic hydrocarbon (PAH) emission that affected the fluorescence time decay in the sooty part of the flame.

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