Maundy, Brent J.Al-Ali, Abdulwadood Abdullah Abdulwadood2018-04-232018-04-232018-04-18Al-Ali, A. A. (2018). Design and Implementation of a Magnitude Only Bio-Impedance Analyzer (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/31812http://hdl.handle.net/1880/106525The increasing interest in the bio-impedance analysis in various fields has increased the demand for portable and low-cost impedance analyzers that can be used in the field. Simplifying the hardware is crucial to maintaining low-cost and portability, but this is not an easy task due to the need for accurate phase and magnitude measurements. This thesis proposes a new measurement technique that replaces the need to measure the phase by using a software algorithm to extract the phase from the magnitude information. The algorithm which is based on a modified Kramers-Kronig transforms was implemented and tested first using MATLAB, where error and noise analysis on the algorithm were done. Furthermore, the algorithm was written using a python code, and a full Bio-impedance measurement system was proposed to be used for fruit quality control which is receiving increasing attention as an important application of bio-impedance measurements, for being a non-invasive technique. The Final design which was implemented on a printed circuit board (PCB), had a final cost of around $95 CAD and drew a maximum current of around 88mA which satisfies the requirement of a low-cost and low-power device respectively. The device was then tested with passive components and several fruit samples to show that it can effectively monitor fruit samples impedance in the range 100 Ohm-280 kOhm, and a frequency range 1 Hz-10 MHz which is higher than any other work in the literature. The proposed portable bio-impedance analyzers were then used to study the ageing effect of some strawberries samples on their bio-impedance, and the results showed that the device could be used in such an application.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.Bio-ImpedanceImpedance SpectroscopyImpedance AnalysisKramers-Kronig TransformImpedance AnalyzerEngineering--Electronics and Electricalmaster thesishttp://dx.doi.org/10.11575/PRISM/31812