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  Products Glossary of Technical Terms  



Ozone Tagging velocimetry (OTV) nonintrusively measures gas velocities by "writing" a line(s) of ozone into an oxygen-containing gas mixture, and then after a delay time "reading" the displaced position of the ozone line(s).  Velocity is determined by dividing displacement by delay time.  The writing process occurs via a two part process:  photodissociation of oxygen molecules using a focused beam of 193 nm light from a pulsed, tunable excimer laser, and subsequent ozone formation from the resulting oxygen atoms' reaction with oxygen molecules.  The read process occurs via another two part process:  photodissociation of ozone using a sheet of 248 nm light from a second pulsed, tunable excimer laser, and fluorescence of the resulting vibrationally-excited oxygen molecules.

Pitz R W, Brown T M, Nandula S P, Skaggs P A, DeBarber P A, Brown M S, and Segall J, 1996, Unseeded Velocity Measurement by Ozone Tagging Velocimetry, Optics Letters, Vol. 21, pp. 755-7.

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.