The effect of Signal-Noise-Ration (SNR) to the estimation of Doppler central frequency has been studied using theoretical method and simulation technique, and results are given in curves.
The mean counts, noise, contrast and profile curves of the slices were measured.
测量断面的平均计数、噪声、冷区对比度及剖面曲线。
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On the base of analysing the properties of existing stator curves, a low noise stator curve with better features was suggested in this paper, which could be applied to design high quality vane pumps.