多电极电磁血液流速仪仿真建模研究

基于电磁流量计权函数理论,将多电极电磁测量方式应用于肢体动脉、静脉血液流速测量。通过将流动截面处划分为不同的区域,利用权函数理论重构流动截面处不同区域内的平均轴向速度值,实现对动脉、静脉血管中互为逆向流动的速度信息测量。在此基础上,通过获取不同位置的弦端电压,利用区域权函数的计算方法,确定流动截面上不同位置的权函数,进而计算流动截面处各个区域的局部轴向平均速度。三维有限元模型仿真和计算结果表明电极的位置、数量以及不同的划分方式重构结果不同,实现了速度重构并测量了局部速度分布。

The modeling and simulation of a multi-electrode electromagnetic blood flow meter

Based on the theory of weight function of the electromagnetic flow meters, the multi-electrode electromagnetic measurement method is applied to the limb arteriovenous blood flow velocity measurement. Through dividing the flow cross-sections into different areas, using the weight function theory to reconstruct the average axial velocities of different areas along the flow section, the measurement of velocity information for the mutual-reverse flowing within arteriovenous and intravenous veins can be realized. Based on this, by deriving different chord terminal voltages and adopting the regional weighting functions'' computation methods, the weighting functions of different positions on the flowing cross-section can be determined, and then the local axial average velocities of different areas of flowing cross-section can be calculated. The three-dimensional finite element model of simulation and calculation results show that the positions and number of the electrodes, different classifying methods have different reconstruction results, realizing the velocity reconstruction and measuring the local velocity distribution.