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  Products Glossary of Technical Terms  



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).

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.

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.