Through the DFT can transform the complicate Time spectrum to simple frequency spectrum in some special frequencies, which have specific amplitudes relatived to different mass transfer process of ultrasound.
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- 通过离散傅里叶变换 ( DFT)将复杂的时域谱转化为频域谱 ;较清楚地将超声对电极反应的影响区分为不同频率下的幅值信号 .