在以驱动波相速度运动的坐标系中，用微扰法讨论。在正弦波驱动下的非线性漂移波的分波方程。
The nonlinear drift-wave equation driven by a sinusoidal wave is discussed in a coordinate system moving in the driving phase speed.
此方法属于单相检测法，先提取电网电流中的某相基波幅值，再将基波幅值乘以与该相电流同相位的正弦波，从而得出该相的瞬时基波电流。
This is a single-phase measurement that multiplies the amplitude of fundamental current of a line by a sine signal which has the same phase with the current.
正弦波检查法因条件所限，无正弦波发生器或频率不准，不易实现。
The sine wave inspection method is limited by condition, does not have the sine-wave-generator or the frequency is not precise, is not easy to realize.
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