基于双频超声波多普勒的血流量测量理论模型及仿真

The Theory Model and Simulation of Blood Flow' Measurement Based on Dual-Frequency Doppler

文章提出双频超声波多普勒血流量测量的理论模型,并加以理论证明,在此基础上通过Matlab对其进行仿真,得到双频超声波多普勒血流量测量的理论结果。即两束多普勒信号虽然载波的频率不同,但是经过带通滤波和低通滤波等一系列处理后,两束多普勒频移信号的频谱分布规律没有发生改变。经运算可使多普勒频移信号得到加强,而噪声信号的功率谱得到有效抑制。

This paper presents dual-band Doppler ultrasonic blood flow measurement theoretical model, prove that theory abstractly and based on this through iMatlab simulation gained dual-band Doppler ultrasonic blood flow measurement theoretical result that although two beam Doppler frequency of carrier signal are different, after band-pass filtering,low-pass filter and a series of treatment, two beam Doppler shift signal distributing rule of spectral distribution do not change, it can be enhanced signal through operation, but noise signal power spectrum is effectively restrained.