Development of the injection current source for the information-measuring system of electrical impedance tomography of biological object

To implement an electrical impedance tomography device, it is necessary to develop one of its most important components - an injected current source, which characteristics affect the metrological characteristics of whole device. In this regard, the task was set to develop such a current source that satisfies a number of requirements regarding the stability of its operation in a given range of frequencies and output current amplitudes, as well as load resistances. As a result of the work performed, a voltage-controlled injected current source for an electrical impedance tomography device was developed, manufactured, and investigated. The error of the amplitude of the output current and the error of the frequency of the output current were studied using a mathematical model and during a full-scale experiment. Active resistance and a biological object were used as a load. As a result of the simulation, it was found that the error in the amplitude of the output current does not exceed 1-5% for a given range of load resistances and frequencies.