二维计数跟踪型激光多普勒测速系统的智能化及其应用

Intelligent control and application of two-dimensional counting-tracing LDA measurement system

二维计数跟踪型激光多普勒测速系统利用两个计数跟踪光电混合反馈环路来分离并测量速度的二维分量。通过智能控制,寻找适当的初始光学频移档次,使得光电信号的有效频率成分分别进入各自对应的信号处理器处理带宽内,同时监视LDA的工作状态,对采集得到的两个环路的光电信号频率及相应的光学频移量,进行一系列的信号处理工作,最终可获得测量点的二维速度分量。二维智能计数跟踪型LDA在非对称突扩管道的流场测量中的应用结果,证实了该套系统的研制是成功的。

Two components of velocity are distinguished and measured by two closed optic_electro_hybrid_feedback loops for counting and tracking in a two_dimensional counting_tracing LDA measurement system. The effective frequencies of optical electric signals are sorted automatically into the corresponding scopes of bandwidth of signal processors, respectively at certain optical frequency shift grades. At the same time, a personal computer supervises the station of the LDA system. The two_dimensional velocities are obtained after a series of disposals of the optical electronic signal frequencies and the optical frequency shifts. In this paper, the application of a two_dimensional counting and tracking LDA measurement system in the flowing measurement of asymmetric sudden wide pipe confirms the successful development of the system.