The basic principle of the linear frequency modulation absolute distance interferometric plan and the problems existed in beating frequency measurement are described.
论述了线性调频绝对距离干涉测量方案的基本原理以及拍频测量中存在的问题；
2
The technique of carrier modulation in Moiré interferometry is important in displacement measurement of an object.
在物体变形场的测量中，云纹干涉的载频调制技术有重要作用。
3
The measurement of modulation transfer function (MTF) of the sampled imaging optoelectronic system is rather complex and irrepeatable for their shift-variant characteristics.