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Hydroxyl Tagging velocimetry (HTV)
measures gas velocities by "writing" a line(s) of hydroxyl (OH) molecules
into a water vapor-containing gas mixture, and then after a delay time
"reading" the displaced position of the OH line(s). Velocity is determined
by dividing displacement by delay time. The writing process occurs via
photodissociation of water vapor using a focused beam of 193 nm light from a
pulsed excimer laser. The read process occurs via fluorescence of the OH
line using a second pulsed laser system (either a 248 nm narrowband, tunable
excimer laser or a UV pulsed dye laser system). |
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Wehrmeyer J A, Ribarov, L A, Oguss D A, Pitz R W, 1999, Flame Flow Tagging
Velocimetry with 193-nm H2O Photodissociation, Applied Optics, Vol. 38, pp.
6912-6917. |
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Pitz R W, Wehrmeyer J A, Ribarov L A, Oguss D A, Batliwala F, DeBarber P A,
Deusch S, Dimotakis P E, 2000, Unseeded Molecular Flow Tagging in Cold and
Hot Flows Using Ozone and Hydroxyl Tagging Velocimetry, Measurement Science and Technology, Vol. 11, pp. 1259-1271. |
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