摘要
介绍了激光多普勒测量技术的原理和差动后向散射测量方式以及数字信号处理式激光多普勒测速仪的设计方案.其中包括基于TMS320VC5402的多普勒信号采集卡硬件电路和软件设计.运用该测速仪对固体表面运动速度进行测量.对采集到的多普勒信号进行高通滤波处理,以提高信噪比,运用傅里叶变换处理数据,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%.
This paper studied the principle of laser Doppler velocity（LDV）,differential backscattering measurement and signal sampling card design based on TMS320VC5402.LDV was used to measure the solid surface speed of movement.High-pass filtered Doppler signal was adopted to improve the 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 showed that the system was applicable in the velocity measurement of solid moving surface,and the accuracy could reach 2%.
出处
《物理实验》
北大核心
2011年第3期18-21,共4页
Physics Experimentation
