LDA激光探头光轴非垂直放置对测量的影响

The effect of off-axis alignment of the LDA-probe on measurement

摘要: 从光学理论角度分析了LDA探头非垂直布置时,光束经过任意层中间介质后测量控制体在被测介质中的性质变化,推导了确定被测介质中测量控制体位置、条纹间距、被测速度方向的计算公式,研究了被测介质中测量控制体随激光探头移动而移动的变化规律。结果表明,LDA探头非垂直布置时,测量控制体具有与垂直布置时不同的性质。

Abstract: The theoretical analysis of the performance parameters of measurement volume with off-axis alignment of the LDA-probe has been carried out.The calculated equations of the location,the fringe spacing of the measurement volume,the direction of measured flow velocity in the flow has been deduced.The proportion of the displacements between measurement volume and the LDA-probe has been determined.The results show that the measurement volume with off-axis of the LDA-probe has different performance from that with on-axis probe.