In addition to alternating phasedifference between two aims of interferometer, the intensity of light of the interference fringes will vary in the same frequency, which is called as phasemodulation.
当两相干光附加一按固定频率变化的相位差时,其干涉条纹的光强将随之交变,即为相位调制干涉。
2
The phasedifference between the signals from beam forming net can affect the modulation index of single channel signal and can lower the precision of tracking.