Abstract
A description is given of an interferometric method to determine the gas density in a gas-droplet mixture. The method uses a laser Mach-Zehnder interferometer in the phase quadrature mode. It is shown that a direct, quantitative and unambiguous determination of gas density changes is possible in a medium that contains light scattering particles. Examples are given of the application of the interferometer to expanding flows with condensation and to shock wave propagation in a fog, illustrating the potential of the method for large and fast density variations.
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