采用光学相干层析研究了粒子流背向散射光强的涨落特性，将粒子对背向散射光的影响分为相位调制和振幅调制两部分，建立了粒子流流速全部分量测量方法，由背向散射光强信号分别得到粒子流多普勒频移和渡越时间，进而计算出流速的纵向分量和横向分量，用聚苯乙烯粒子悬浮液对这种流速测量方法进行了实验验证。

Characteristics of the intensity fluctuation of the light back-scattered by flowing particles are studied. The influence of moving particles on back-scattered light is divided into phase modulation and amplitude modulation, and a new model is proposed that includes the total information of both axial and lateral components of velocity. Based on the new model, the two velocity components can be calculated according to the Doppler frequency shift and the transit time derived from the detected light intensity signals. The proposed model is experimentally verified using polystyrene particle suspension flow.