摘要
二维频移激光多普勒测量油中悬浮粒子速度时,根据悬浮粒子通过针孔光阑时存在的四种不同情况,对原有激光多普勒测量悬浮粒子瞬时速度的方法进行了改进,提出一种悬浮粒子瞬时速度分析处理方法,利用该方法,对水平方管内的油中悬浮粒子的瞬时速度进行了测量分析。结果表明:改进方法获取的悬浮粒子瞬时速度的稳定性较好,能够表征在一组粒子通过激光多普勒的针孔光阑的时间段内粒子组随着时间的变化趋势,提高了频移激光多普勒采样数据的利用效率,有利于进一步准确表征悬浮粒子在油液中二维瞬时速度的分布特征和运动轨迹,为激光多普勒实验测量中悬浮粒子瞬时速度的表征提供理论支撑。
Two-dimensional frequency shift laser Doppler velocimetry（LDV）is used to measure the instantaneous velocity of suspended particles in oil,according to four different situations of suspended particles going through the pinhole aperture of LDV.The original processing method of instantaneous velocity of suspended particles LDV is improved,an analysis processing method is proposed.The improved method shows better stability in measuring the instantaneous velocity of suspended particle,it can characterize the change trends of particle group with time when a group of particles are passing through the pinhole aperture in LDV,and it enhances utilization efficiency of the sampling data of the frequency shift LDV.This method further accurately characterizes the distribution and motion trajectory of two-dimensional instantaneous velocity of suspended particles in oil,providing theoretical support for the characterization of the instantaneous velocity of suspended particles in the experimental measurement of LDV.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2017年第2期141-148,共8页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(51375516)
重庆基础与前沿研究项目(cstc2016jcyjA0185)
关键词
激光多普勒测速
悬浮粒子
瞬时速度
频移数据
针孔光阑
laser Doppler velocimetry
suspended particles
instantaneous velocity
frequency shift data
pinhole aperture
