差动激光多普勒测速仪在固体速度测量中的应用

详细信息

Application of differential laser Doppler velocimeter in solid velocity measurement

College of Optoelectronic Science and Engineering,National University of Defense Technology,Changsha 410073,China

摘要: 采用差动型后向散射的方式进行实验，利用数据采集卡PCI DAS-4020采集信号，并在Labview软件中对信号进行滤波处理，以提高信噪比，运用傅里叶变换(FFT)处理数据，计算出运动目标的速度并与实际速度进行了比较。结果表明该系统用于固体表面速度的测量切实可行，精度可达到2.2%。
- 差动型 /
- 多普勒测速 /
- Labview /
- 快速傅里叶变换
Abstract: An experiment was carried out by differential measurement and backscattering mode. The Doppler signal was acquired by the data acquisition board PCI DAS-4020, and the signal data filtering was performed to improve SNR. The frequency spectrum was acquired by fast Fourier transform, and the calculated velocity of the moving target was compared with the actual velocity. The results show that the system is applicable for the velocity measurement of solid moving surfaces, and the accuracy can reach 2.2%.
- differential mode, Doppler speed measurement, Labview, fast Fourier transform (FFT)