理论分析表明，谐闪耀光栅谐振波长数目随谐波数增加而增加，因此可用于多波长斜光束的高效耦合；
Theoretical analysis shows that the number of working wavelength will increase with the increment of the harmonic number of the harmonic blazed grating.
通过单频输入和多谐波输入说明了谐波平衡法的工作原理。
Operation principle of harmonic balance method is explained through the input of single frequency and multiple harmonic.
这种中压变频器输出电压为多电平pwm脉冲波形，目前对其谐波还没有完善的理论分析。
Output voltage of this type ASD is multilevel PWM waveform, and by now there is not perfect theoretical analysis for its harmonics.
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