Research On Simulation And Speed Reconstruction Algorithm Of Multi-Electrode Electromagnetic Blood Measurement System

The volumetric flow of fluid is one of the common parameters that need to be detected and controlled in real time in production and life,and the electromagnetic flowmeter is a volumetric flow inductive meter that can be used to measure conductive fluids.Human blood flow in fluid volume flow is an important indicator for diagnosing cardiovascular disease.Cardiovascular disease accounts for a large part of the global lethal disease,so the focus of this paper is to study a reliable,easy to use,low-cost,non-invasive blood.Flow rate measurement method.The multi-electrode electromagnetic flowmeter measurement technique is insensitive to viscosity,temperature,conductivity,pressure loss,and symmetry of the fluid velocity profile,and enables non-invasive measurements,thereby enabling measurement of blood flow in the blood vessels of mammalian limbs.In this paper,based on the multi-electrode electromagnetic flowmeter measurement method for multi-phase flow,the online measurement of the velocity distribution of arteriovenous blood in the upper limb of the human body is realized.The multi-electrode electromagnetic blood measurement system measures the induced electromotive force of blood flow through a plurality of electrodes distributed on the skin,and uses a velocity reconstruction algorithm to calculate the blood flow velocity distribution of the arteries and veins in the limb.This paper establishes the COMSOL simulation model to simulate the human limb structure,and uses the weight function to verify the feasibility of the multi-electrode electromagnetic measurement system theory.The special conditions of arteriovenous blood measurement of human limbs,such as the specificity of arteriovenous position and the formation of thrombus,were simulated.At the same time,the excitation system is optimized.Based on Helmholtz coil and C-type coil,the influence of different design schemes on the accuracy of simulation reconstruction is compared.The optimal design scheme of excitation coil is proposed.The finite element analysis method is used to simulate COMSOL.To obtain the regional weight function,use MATLAB to study blood velocity reconstruction.Comparing the advantages and disadvantages of the six excitation system schemes,combined with the actual measurement needs,the optimization of the excitation system is realized.Finally,for the high-resolution area division method,the speed reconstruction algorithm is studied.By comparing the five matrix inversion algorithms in the dataprocessing,the cross-correlation algorithm of the data is first determined and then the block matrix is obtained.The inverse calculation method is most suitable for multi-electrode electromagnetic blood measurement systems.