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OZONE TAGGING VELOCIMETRY |
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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.
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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.
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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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