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The orientational fluctuations in a smectic liquid crystal were successfully observed with a high-speed video camera. From the series of images obtained, first the spatial Fourier transformation of each image was computed and then the time correlation function at each wave number was calculated. It was found that the time correlation function shows an exponential decay and the inverse of the relaxation time is proportional to the square of the wave number. The ratio of the elastic constant to the viscosity was also obtained in this experiment.
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Orihara et al. (1998) studied this question.
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