Single-shot three-dimensional tomographic measurements of the hydroxyl radical (OH) concentration were demonstrated in a lifted hydrogen-methane jet flame. The second-harmonic output of a 10-Hz Nd:YAG laser pumped a dye laser that was frequency doubled to excite the Q_1(5) transition in the A~2∑~+←X~2∏(1,0) system of OH at 282.75 nm. The beam profile was expanded to 40 mm in diameter and illuminated the base of the lifted jet flame. Two high-speed intensifier-coupled CMOS cameras with quadscopes were used to collect eight views of the OH fluorescence emission. A CCD camera was used to record the beam profile.
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