Ozone Flow Tagging Scheme for Air Inlet Testing

Two separately tunable, narrowband excimer lasers were used to photo-dissociate O2. The O-atom photoproducts rapidly react with ambient O2 to form O3, and thus marked a volume of air with a line of ozone. After a fixed time delay, a second laser measured progress of the tagged volume of air by photodissociating ozone, and monitoring the vibrationally excited O2 photoproduct by planar laser induced fluorescence (PLIF). The spatial displacement of the tagged line was used to measure the velocity in a time-of-flight fashion. Because of ozone's rapid formation (20 microsecs) and long chemical lifetime (2 s), a broad range of velocity measurements are possible. --Original contains color plates: All DTIC reproductions will be in black and white.