Development of self-mixing type laser Doppler frowmetry

本文从理论和实验上研究了从多个不同速度分量的运动目标中获取的自混合多普勒信号的特性，用于测量组织中的血流。结果表明，从多个运动目标获得的不同频率分量的各个波形中，自混合多普勒信号是线性叠加的。叠加频谱的最大频率(Fmax)约为多个不同速度运动目标峰值流速的70%。该值可作为判断组织血流的暂定标准。血流速度频率(Fmax)与流道内已知血流速度(0.994)之间有很好的线性关系。

We investigated the characteristics of a self-mixed Doppler signal obtained from multiple moving targets with different velocity components theoretically and experimentally for the measurement of blood flow in tissue. The results showed that the self-mixed Doppler signal was linearly superimposed from each waveform of the different frequency components obtained from the multiple moving targets. The maximum frequency (Fmax) of the superimposed spectrum was estimated to be about 70% of the peak flow velocity of the multiple moving targets with different velocities. This value provides tentative criteria for judgment of tissue blood flow. Excellent linear relationships were obtained between the frequency (Fmax) of the blood velocity and the known blood flow velocity in the flow channel (0.994).