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Impedance spectroscopy is widely used in various test& measurement fields and applications. In current paper a novel approach of excitation with chirp signal with simple time-domain analysis of response signal for such task is introduced and described with examples of measurement of the electro-mechanical impedance of piezo-sensors, in the frequency range of several hundred kiloherz. In one approach...
The paper presents a way to perform multi-channel bio-impedance measurement on several frequencies applying a special FPGA circuit for fast synchronous primary signal processing. The primary processing involves only additive operations and uses stored data 1) to simplify a possibility to obtain higher resolution of measurement signalpsilas samples V(n) applying AD conversion (mainly) for the differences...
Measurement of electrical bioimpedance enables to characterize a state of tissues/organs, to get diagnostic images, to find hemodynamical parameters, etc. In this paper we consider a digital multichannel bioimpedance analyser developed for monitoring of the state of a working heart. The signal-processing task, which must be solved in this analyser, is described and some proposed alternative algorithmic...
Measurement of electrical bioimpedance enables to characterize a state of tissues/organs, to get diagnostic images, to find hemodynamical parameters, etc. In this paper we consider a digital multichannel bioimpedance analyser developed for monitoring of the state of a working heart. The signal-processing task, which must be solved in this analyser, is described and some proposed alternative algorithmic...
This paper presents an adaptive filtering system for separation of two bio-impedance signal components: cardiac and respiratory signals. The proposed filtering system is adaptive to the parameters of the input signal's cardiac component (the reference signal), which is corrupted by the respiratory component and also by additive stochastic disturbances. The adaptation is achieved applying estimation...
The paper focuses on principles of designing of a multichannel bioimpedance analyzer based on simultaneous multisine measurement. The measurement task arises due to the need to monitor patients during and after heart surgery operation performing MIMO (multiple-input-multiple-output) bioimpedance measurement. Frequencies of the simultaneously applied sinusoidal excitations must be close but simultaneously...
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