交流非正弦信号可以分解为不同频率的正弦分量的线性组合。当正弦波分量的频率与原交流信号的频率相同时，称为基波；当正弦波分量的频率是原交流信号的频率的整数倍时，称为谐波；当正弦波分量的频率是原交流信号的频率的非整数倍时，称为分数谐波，也称分数次谐波或间谐波。
说明系统运动非线性产生的分数次谐波，是诱发噪声的直接原因。
The result shows that nonlinearity of the system induces the fractional harmonic which roots in the noise.
因而，新窗函数谐波分析方法特别适用于分数次谐波分析，且能提高弱谐波信号的分辨能力和准确度。
So it can be applied to fractional-harmonics analysis more preferably and therefore improve the resolution capability of weak harmonic component and accuracy of harmonic analysis.
采用分布反馈式半导体激光器作为光源，通过光源调制实现气体体积分数的谐波检测，显著提高了检测的灵敏度。
Using DFB LD as light source, the detection sensitivity has been greatly improved by light source modulation harmonic measurement.
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