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Abstract:   (5235 Views)
In this paper, we measure the velocity of nanoparticles suspended in a fluid by using the "zero-crossing" of the intensity fluctuation of laser speckles. The speckle patterns are formed by illuminating the CdZnS nanoparticles suspended in ethanol with a Gaussian laser beam. The zero crossing number of scattered speckle pattern is detected in diffraction field by a circular aperture in front of power meter. The velocity of nanoparticles is measured by counting the zero crossing of the spatially integrated speckle intensity fluctuation in different temperature.
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Type of Study: Research | Subject: Special

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