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Unseeded velocity measurement by ozone tagging velocimetry

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Abstract

Ozone tagging velocimetry is developed for unseeded velocity measurement of air flows. An ozone line is photochemically created by an ArF excimer laser. After a fixed time delay the ozone line is imaged with a KrF excimer laser sheet (248 nm) that photodissociates the ozone and produces vibrationally excited O2. The O2 is excited by the same 248-nm light through the Schumann–Runge band, BΣu-3(v=0,2)XΣg-3(v=6,7). An intensified CCD camera records the O2 fluorescence from the initial and the final line positions to permit the velocity profile along the line to be determined.

© 1996 Optical Society of America

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