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| Fig. 1 Principle of write and read laser ozone tagging velocimetry technique for gas flow measurement. |
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| Fig. 2 Experimental setup of OTV based upon two-wavelength emission from a double-tube excimer laser. |
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| Fig. 3 OTV image of a tagged air flow obtained with 50 Hz repetition rate. The average flow velocity is set to 40 cm/s. The measured velocity at the centerline is 45 cm/s. |