With the expansion of frequency range of modern laser and the enrichment of light detection method, sensitivity of Raman spectrum has made great progress.
随着激光光源频率范围的不断扩展，光探测手段的不断丰富，拉曼光谱的检测灵敏度获得了极大的提高；
When the signal spectrum falls into two or more channels, a method of spectrum assembling in frequency domain is used to obtain the positive or negative half spectrum.
在频域中当信号频谱处于两个或更多个滤波器通道时，通过频谱组合办法直接得到实信号的正半谱或负半谱。
Radio frequency noise jamming can be deleted by the method of average range frequency spectrum and notching in frequency domain.
对于射频噪声，通过平均距离频频法和频域陷波的方法可以去掉；
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