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Three-dimensional imaging of the tracer concentration field is demonstrated at a rate of 20kHz in a turbulent gaseous free jet. The acetone tracer species that is seeded into the jet is excited by the fourth-harmonic output of a Nd:YAG burst-mode laser. The laser beam is expanded and re-collimated to a 35-mm-diameter beam and passed through a diffuser to reduce spatial variations within the beam profile...
Three-dimensional concentration fields are demonstrated using tomographic reconstruction of volumetrically illuminated turbulent flows at 20 kHz. High-speed intensified cameras coupled with vertical stereoscopes collect fourteen simultaneous views of acetone fluorescence.
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