Wideband bioimpedance meter with the adaptive selection of frequency grid
Journal Title: Вісник НТУУ КПІ. Серія Радіотехніка, Радіоапаратобудування - Year 2014, Vol 0, Issue 57
Abstract
Introduction. For the diagnosis of functional state and structure of biological objects with weakly expressed irregularities it is important quickly and accurately to determine the amplitude- and phase-frequency characteristics. Therefore, the purpose of the article is a representation of the results of the development of biological objects high-speed impedance meter with the ability to select adaptive grid measuring frequencies in the extended band. Structure of the impedance meter. Developed instrument is designed to measure the impedance of the object on four-electrode method. The device uses a frequency synthesizer amplitude-phase detector integrally fabricated and active electrodes, by which the voltage controlled current source and the input buffer amplifiers with low input capacitance, are located in close proximity to the studied bioobject. This allowed to make measurements at frequencies up to 5 MHz. Instruments characteristics. To test the device characteristics the frequency characteristics of the test object (RC-chain) impedance were measured. It is composed of 5 precision resistors and capacitors. Parameters of the elements were measured preliminarily by laboratory inductance, capacitance and resistance meter E7-12. The dependence of the measurement errors of the developed device in the frequency range from 1 kHz to 5 MHz is not more than 5% of the modulus of the impedance and not more than 2° of the phase.
Authors and Affiliations
V. Mosiychuk, G. Timoshenko, O. Sharpan
Keywords
Related Articles
- EP ID EP308894
- DOI 10.20535/RADAP.2014.57.143-148
- Views 65
- Downloads 0
Adaptive signal detection on the background clutter
Introduction. The article poses the problem of optimal detection of coherent-pulsed signals of moving targets against a background of clutter with a priori uncertainty of the signals and clutter parameters. The aim of th...
Distributed information-processing system with voice control based on OS Android
Introduction: Trends of increase of ACS and AIS and their use in everyday life are discussed. The need a voice mode of human interaction with AIS is mentioned. Noticed that network integration of AIS allows to combine th...
Radiation characteristics of novel “ring-in-cone” antenna
Results of numerical investigations of radiation characteristics of the finite “ring-on-rod” antenna and a novel combined “ring-in-waveguide” and “ring-in-cone” antenna are presented.
Sidelobe cancelation filters
Features of building and usage sidelobe cancelation filters for phase-shift keyed signal witch generate under the law as well-known code sequences are considered. The result of processing phase-shift keyed signal by mean...
77 HHz radar for automobile
Modern requirements to safety and comfort of drivers and passengers of a car cause continuous development of corresponding technical facilities. Technologies that provide implementation of these requirements are on the f...