We developed a flow visualization system based on laser Doppler velocimetry (LDV) to investigate the relationship between blood flow and blood coagulation in a blood chamber in an extracorporeal circulation circuit. Linear laser intersection was used to implement 32-point simultaneous measurement. The intersection region was traversed along the axial direction to obtain a two-dimensional (2D) velocity distribution as a contour graph. The optical assembly of the flow visualization system is very simple. Furthermore, there is no need to submerge the measurement object in a square water tank to reduce the influence of refraction and reflection. Because LDV has inherently high measurement accuracy, even slight flow velocity changes (less than 1 mm s −1 ) can be clearly identified in a blood chamber.

中文翻译：

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激光多普勒成像系统测量血腔中的旋流

我们开发了一种基于激光多普勒测速仪（LDV）的流量可视化系统，以研究体外循环回路中血流与血腔中凝血的关系。线性激光交点用于实现32点同时测量。沿轴向遍历相交区域以获得二维（2D）速度分布作为轮廓图。流量可视化系统的光学组件非常简单。此外，无需将测量对象浸没在方形水箱中以减少折射和反射的影响。由于LDV本质上具有很高的测量精度，因此即使在血腔中，即使是微小的流速变化（小于1 mm s -1）也可以清楚地识别出来。