The Gaussian beam defect is now a well documented deficiency of conventional phase Doppler anemometers and leads to significant errors in particle size estimation when the particle size takes on dimensions of the same order as the measurement volume. In the present paper, an alternative operation mode of conventional, two-component phase Doppler anemometry systems is proposed, which removes these errors for many applications. The new approach is analysed theoretically and its improved performance is verified experimentally. Furthermore, the effect of a slit aperture on the trajectory-dependent size measurement has been experimentally investigated.
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Xu et al. (1994) studied this question.
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