摘要
本文介绍差动式多普勒激光测速仪的工作原理和光学系统,解释其差动机理的应用及对改善SNR的作用。本文还讨论了PLDV光电流功率谱与折算流适的概率密度函数P_d(u_c)的相似性及有限渡越时间的加宽及空间分辨率问题。本文列举了明槽水流中光滑平板和溢流坝表面边界层的研究结果,还提到了测定公牛精子浮游速度的实验及由圆管内流速分布确定流量的研究。
The principles of operation and the optical sketch of polarized Doppler Laser Velocimeter have been presented in this paper. The mechanism of its differential utilization and the effect on improvement of S.N.R. are explained. The similarity betwen spectrum of photoelectric current of PLDV and probability density func- tion P_d(u_c) of investigated flow velocity, the finite transit time broadening of the spectrum as well as the spatial resolution ability problem have been discussed. Results of boundary layer research both on a smooth plate in open channel water flow and on a overflow dam surface are illustrated. Experiments of determination of swimming velocity of bull's spermatozoa and evaluation of flow rate in circular pipe are mentioned.
出处
《北京建筑工程学院学报》
1990年第2期45-56,共12页
Journal of Beijing Institute of Civil Engineering and Architecture
