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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。
The two-dimensional counter-tracking laser Doppler velocimetry system uses two counter tracking optoelectronic hybrid feedback loops to separate and measure two-dimensional components of velocity. Through intelligent control, look for the appropriate initial optical frequency shift grade, so that the effective frequency components of optical signals into their respective signal processing bandwidth, while monitoring the working status of the LDA, the collected two loop optical signals Frequency and the corresponding optical frequency shift, a series of signal processing work, and finally get the two-dimensional velocity component of the measurement point. The application of two-dimensional smart counting and tracking LDA in the flow field measurement of asymmetric spreaded pipe confirmed the successful development of this system.