Abstract

Burst-mode planar laser-induced fluorescence (PLIF) imaging of the OH radical is demonstrated in laminar and turbulent hydrogen–air diffusion flames with pulse repetition rates up to $50\mathrm{kHz}$. Nearly $1\mathrm{mJ}$/pulse at $313.526\mathrm{nm}$ is used to probe the OH $P_2\left(10\right)$ rotational transition in the (0,0) band of the A-X system. The UV radiation is generated by a high-speed-tunable, injection-seeded optical parametric oscillator pumped by a frequency-doubled megahertz-rate burst-mode Nd:YAG laser. Preliminary kilohertz-rate wavelength scanning of the temperature-broadened OH transition during PLIF imaging is also presented for the first time (to our knowledge), and possible strategies for spatiotemporally resolved planar OH spectroscopy are discussed.

© 2009 Optical Society of America

100  kHz thousand-frame burst-mode planar imaging in turbulent flames

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