The MLR mathematical model that established with orthogonal signalcorrection plus first derivative and mean centre preprocessed spectra shows the best result for glucose and fructose.
Compared with the original two kinds of Phase-Difference Correction, only one sequence of time-domain signal is sampled and FFT analysis of same points is performed twice in this method.
与原两种相位差法相比，这种方法只采一段时域信号，且进行两次相同点数的FFT分析。
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After correction, the estimates of signal amplitude and frequency have high accuracy.