Reconfigurable Bioimpedance Spectrometer for the Evaluation of Impedance Estimation Methods Suitable for Spectroscopy Measurements
Year: 2012
Type: dissertation
Abstract: The measurement of electrical bioimpedance deals with the measurement of the opposition to the flow of charges exhibited by a biological material when an electrical stimulus is applied.The impedance estimation implemented in an impedance meter is a paramount key functional blocks influencing in the measurement performance and application of the measurement device.In this work a configurable bioimpedance measurement system has been implemented using the NI USB-6218 Data Acquisition board and LabVIEW development environment.The implemented system allows the implementation of different impedance estimation methods and tests their performance.To show the intended functionality two different impedance estimation methods have been implemented: Digital Sine Correlation and Digital Deconvolution through Total Least Squares.The performances of both systems have been validated with 2R1C circuits.The multisine excitation implemented with two NI USB-6218 units produce a time delay that required signal synchronization prior the application of digital deconvolution.The measurement results show that is possible to produce multifrequency bioimpedance measurements with both approaches well using frequency sweeping or multisine excitation.
Author: Zelealem Kebkab Kassaye
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2132118539