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The main approaches to the parametric analysis of measuring transducers of galvanostatic type impedance on the base of SPICE-simulation are reviewed in the paper. The galvanostatic measuring method which is based on the basis of determining the value and the phase delays between the voltage and current harmonic defined amplitude and frequency was used in the process of simulation. As a result, the...
Investigating intracerebral tissue at single cell level has become increasingly important in animal studies and meanwhile found its way into clinical applications. The stability of single unit activity (SUA) to be recorded can be however quite elusive, which -among others- might be caused by the mechanical mismatch of stiff neural implants and soft brain tissue. Unfortunately, the variety of factors...
Bioimpedance measurements on the human thorax are suitable for assessment of body composition or hemodynamic parameters, such as stroke volume; they are non-invasive, easy in application and inexpensive. When targeting personal healthcare scenarios, the technology can be integrated into textiles to increase ease, comfort and coverage of measurements. Bioimpedance is generally measured using two electrodes...
Electrical Impedance of biological tissues changes with the change in tissue anatomy and tissue physiology. Electrical Impedance Spectroscopy (EIS) has been studied to characterize the biological objects like fruits and vegetables for assessing their freshness. In this direction, the EIS studies have been conducted as a non-destructive investigation evaluation method to study the electrical impedance...
Alterations in the health of muscles can be evaluated through the use of electrical impedance myography (EIM). To date, however, nearly all work has relied upon single-frequency/spectroscopy stepped-sine measurements of static muscle (contracted or relaxed). In this work, we assessed the temporal alterations in the impedance spectrum (1 kHz to 1 MHz) behavior of gastrocnemius during the active process...
This paper presents DC impedance characterization of glucose concentrations in human blood using Electrical Impedance Spectroscopy (EIS). Results are investigated also through two solutions other than human blood: 1) 0.9% NaCl, 2) Saline (NaCl 1.3gm, KCl 0.75gm, Na3C6H5O7 1.45gm, D-glucose 6.75gm in 500mL) for every 25mg/dl change of glucose in total 150ml solution. A rectangular current pulse of...
A pulsed method for impedance spectroscopy measurement, different from the traditional swept frequency methods, is presented. A string of square-wave pulses is digitally generated as the excitation signal to the sensing electrodes. A pulsed measurement system is described. A sample-collecting method for sampling the instantaneous response signals is implemented based on a field programmable gate arrays...
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