Abstract

A new technique is described that permits calculation of all three instantaneous components of the concentration gradient vector within a cross section of a turbulent gas jet. This is made possible by the simultaneous measurement of gas concentrations from two closely spaced parallel cross sections using laser Rayleigh scattering from two illumination sheets of different wavelength. The use of a second sheet gives access to an extra dimension of information, which is valuable in testing models of turbulent mixing.

© 1986 Optical Society of America

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