Abstract—The structure of a signal reflected from a vibrating surface is studied in the case when the vibration amplitude is comparable to or significantly greater than the wavelength of the probing electromagnetic wave. It is shown that the relations between the amplitudes of the highest harmonics makes it possible to calculate the vibration amplitude in situations when it is longer than the probe wavelength. Criteria are obtained that make it possible to choose the harmonics of the reflected signal to uniquely determine the vibration amplitude. It is shown that the effect of energy redistribution between a large number of harmonics of the reflected signal, which occurs with an increasing phase modulation index, leads to a decrease in their amplitude by about 1.75.

摘要—在振动幅度等于或明显大于探测电磁波波长的情况下，研究了从振动表面反射的信号的结构。结果表明，高次谐波的振幅之间的关系使得可以在比探头波长长的情况下计算振动振幅。获得了可以选择反射信号的谐波来唯一确定振动幅度的标准。可以看出，随着相位调制指数的增加，大量反射信号谐波之间的能量重新分配效应会导致振幅降低约1.75。