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；
Compared with general interferometric method, the modulation interferometry has an advantage of high precision.
与通常干涉仪测量方法相比，这种方法具有测量灵敏度高等优点。
Then, it describes the applications of intensity modulation fiber-optic sensor, interferometric fiber-optic sensor, fiber-optic grating and fiber-optic acoustic emission sensor.
同时，文章阐述了强度调制型光纤传感器、干涉型光纤传感器、光纤光栅和光纤声发射传感器的应用。
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