简述了激光多普勒测速及流场显示原理；
The principle of Laser Doppler Velocimetry and the method of showing the fluid field are briefly introduced.
VISAR是目前激光多普勒测速仪器中最具代表性的一种，本文作了重点介绍。
VISAR is the best typical kind of laser Doppler velocity interferometer at present and is focal point in this paper.
本文设计了一套激光多普勒测速系统，并对该系统作了理论分析和计算。
A laser Doppler velocimetry system is designed, and its theoretical analysis and computation are made.
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