激光多普勒流速计是利用激光照射运动粒子时,粒子散射光产生的多普勒频移与粒子运动速度成正比的多普勒效应系及光外差技术来测量流速的一种新技术。由于它非接触测量,不破坏介质的流态,不影响流速场中速度的分布,几乎无惯性,以及测量范围大,空间分辨率高,所以从1964年开始研制以来,几年间获 The laser Doppler flowmeter is a new technique to measure the velocity of flow by using Doppler effect and optical heterodyne (Doppler effect), which is proportional to the Doppler shift caused by the scattered light of the particle when the laser irradiates the moving particle. Because of its non-contact measurement, does not destroy the flow of the medium, does not affect the distribution of speed velocity field, almost no inertia, and the measurement range, high spatial resolution, so since the development began in 1964, a few years was