A new compact micro-lens optical system has been
developed to produce a 7 x 7 multiline optical grid for
Hydroxyl Tagging Velocimetry (HTV). These lines
provide additional spatial information and aid the
software tracking of the flowfield by increasing its
resolution. Single-photon photodissociation of groundstate
H2O by a ~ 193-nm ArF excimer laser “writes†a 7
x 7 beam molecular grid with very long gridlines of
superequilibrium OH and H photoproducts in either
room air flowfields or in H2-Air flames due to the
presence of H2O vapor. The displaced OH tag lines'
positions are revealed through fluorescence by A2Σ + (v ′
= 0) ↠X2Πi (v ″ = 0) OH excitation using a ~ 308 nm
pulsed frequency-doubled dye laser. A time-of-flight
software (DaVis 6.0 Stereo PIV / PTV, LaVision,
GmbH) determines the instantaneous velocity field.
HTV tag lifetime comparisons between experimental
results and theoretical predictions are discussed.
developed to produce a 7 x 7 multiline optical grid for
Hydroxyl Tagging Velocimetry (HTV). These lines
provide additional spatial information and aid the
software tracking of the flowfield by increasing its
resolution. Single-photon photodissociation of groundstate
H2O by a ~ 193-nm ArF excimer laser “writes†a 7
x 7 beam molecular grid with very long gridlines of
superequilibrium OH and H photoproducts in either
room air flowfields or in H2-Air flames due to the
presence of H2O vapor. The displaced OH tag lines'
positions are revealed through fluorescence by A2Σ + (v ′
= 0) ↠X2Πi (v ″ = 0) OH excitation using a ~ 308 nm
pulsed frequency-doubled dye laser. A time-of-flight
software (DaVis 6.0 Stereo PIV / PTV, LaVision,
GmbH) determines the instantaneous velocity field.
HTV tag lifetime comparisons between experimental
results and theoretical predictions are discussed.
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