Abstract:

 Due to the limited sampling rate of hardware and the weak auto-processing performance in the traditional

laser Doppler velocimetry experimental system，virtual simulation and hardware improvements of the system

are carried out in this work.To develop the virtual simulation，Unity 3D and Matlab Apps are employed to model the

experimental principles and the related signal processing methods.In this way，students could gain a deeper understanding

of the experimental system. Meanwhile，for hardware improvements，a convenient high - speed data

acquisition system is constructed by using LabVIEW programming and digital oscilloscope.And then the sampling rate of the existing hardware is increased from 50 MSa /s to 2 GSa /s.In the parts of software system，various digital

processing modules，such as digital filtering and automatic measurement，are realized to highly improve the performance

of the current experimental system.This work provides a reference for the teaching content and system design of

laser Doppler velocimetry.

Key words: laser Doppler velocimetry, signal spectrum analysis, high-speed data acquisition, LabVIEW