应用单周期层栅和基于旋转场辨别速度方向的激光多普勒测振系统是近年来研制出的一种新型测速手段,本文综述其机理方面的理论与实验研究工作。 The application of a single-period grid and the laser Doppler vibration measurement system based on the rotational field to identify the direction of velocity are a new measure method developed in recent years. This paper reviews the theoretical and experimental research on its mechanism.