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。采用计数跟踪方法后,光电信号的带宽被压缩了至少一个数量级,使得该系统不仅工作稳定可靠,而且结构简单、成本低廉。详细讨论该系统的工作原理、构成,并给出实验研究结果。 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. With the counting and tracking method, the bandwidth of the optical signal is compressed by at least an order of magnitude, making the system not only stable and reliable, but also simple in structure and low in cost. The working principle, constitution of the system are discussed in detail, and the experimental research results are given.