激光多普勒测速 (LDA)已成为科学研究中测量固体表面运动速度和复杂流场流动速度的一种强有力的手段 ,受到普遍的重视。而多普勒信号处理器则在整套测速系统中起着非常关键的作用。基于PC机的LDA信号处理器采用平均周期图法对LDA光电信号进行分析 ,并利用补零、加窗、频率放大等信号处理措施大大提高了整套系统的噪声适应能力 ,同时简化了系统的硬件结构。随着PC机的迅速发展 ,这种信号处理方法必然有着越来越好的发展前景 Laser Doppler velocimetry (LDA) has become a powerful tool in scientific research to measure the velocity of the solid surface and the velocity of the complex flow field, and has received universal attention. The Doppler signal processor in the entire speed system plays a very crucial role. The PC-based LDA signal processor uses the average periodogram method to analyze the LDA optoelectronic signals and uses signal processing measures such as zero-padding, windowing and frequency amplification to greatly improve the noise adaptability of the entire system and simplify the system hardware structure. With the rapid development of PC, this signal processing method is bound to have more and better development prospects