Electrical characteristic detection method for identifying foreign matters in small-scale pipeline

Abstract

The invention discloses an electrical characteristic detection method for identifying foreign matters in a small-scale pipeline, and relates to the technical field of electrical tomography. The method specifically comprises the steps of: firstly, attaching an ECT sensor and an impedance sensor to a to-be-detected pipeline through flexible electrode patches, and performing real-time monitoring; when the electrical characteristics of the blood change, performing short-time Fourier transform on a blood impedance value measured by the impedance sensor to obtain frequency spectrum information of impedance; meanwhile, enabling the ECT sensor to collect capacitance between the exciting electrode and each measuring electrode, reconstruct an electrical parameter distribution image of the blood by using a regularization inversion algorithm, and correct the distribution of electrical parameters by using a hybrid Hanai equation; and finally, comprehensively analyzing the impedance spectrum information and the corrected electrical parameter distribution image, identifying foreign matters in the small-scale pipeline, and checking the electrical characteristics of the foreign matters. According to the invention, more accurate response measures can be taken for the electrical characteristic change of blood clinically.

Description

technical field [0001] The invention relates to the technical field of electrical tomography, in particular to an electrical characteristic detection method for identifying foreign objects in small-scale pipelines. Background technique [0002] Many industrial processes and medical fields involve the measurement of multiphase flow parameters in small pipes or micropipes, such as the measurement of void ratio of gas-liquid two-phase flow in small pipes, the capture imaging of single cells in micropipes, and blood extracorporeal circulation systems. Thrombus (including gas thrombus) measurement and other issues. Among them, foreign substances in some practical applications are conductive, and the measurement sensor is required to be non-invasive, which puts forward high requirements for the design of the sensor and the measurement method. [0003] The measurement of blood electrical characteristics in the blood extracorporeal circulation system is taken as an example for illu...

AI Technical Summary

Problems solved by technology

[0007] At present, some studies have combined electrical impedance spectroscopy to evaluate the blood condition in the extracorporeal circulation system, but it obtains the average electrical characteristics of a certain section of blood in the pipeline, and cannot perform real-time imaging to obtain local information

There have also been studies using electrical resistance tomography to visualize thrombi in blood, but this is limited to situations where the blood is in static conditions

Moreover, the sensors used in the above two technologies are in direct contact with blood, which cannot guarantee biosafety

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