HIGH-PRECISION DATA COLLECTION SYSTEM FOR ELECTRICAL IMPEDANCE IMAGING

摘要

A high-precision data collection system for electrical impedance imaging. The system is constructed by a main control module, a programmable current source, an electrode interface module, a voltage measurement module, a current detection module, a digital demodulation module, a communication interface module and the like. Excitation currents in an imaging target region are accurately regulated and controlled through the current detection module and the programmable current source, distribution differences are effectively suppressed through an electrode selection switch system in the electrode interface module, external interference is effectively blocked through an electrode wire double-shielding system in the electrode interface module, and coherent demodulation of response signals and excitation signals is achieved through the digital demodulation module. Therefore, the influence of distribution parameters and external interference in the data collection system for electrical impedance imaging can be effectively suppressed, nonlinear errors of a measurement result are reduced, the signal to noise ratio of measured data is increased, the key problem that it is difficult to further improve data collection accuracy in the electrical impedance imaging research is solved, and high application value is achieved.