【摘要】 超声血流仪实现其测量血流速度的关键是多普勒频移信号的提取，多普勒频移信号是血流速度的真实反映。本文详细的论述了依据正交相位检测法提取多普勒频移信号的方法，并对各部分实现电路作一简要的介绍。更多还原

【Abstract】 As Doppler shift signal can significantly reflect the speed of flow,the ab-stracting of Doppler shift signal is the key of blood flow speed testing in a ultrasonic blood flow detector. This paper has discussed the way of probing Doppler shift signal based on crossed phase detecting method in detail and introduced each function circuits briefly.更多还原