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Design and implementation of an impedance analyzer based on Arduino Uno: A pilot study of bioelectrical impedance analysis
KTH, School of Technology and Health (STH).
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Electrical bioimpedance measurement is widely used today for monitoring body condition. The applications include and go beyond, body composition assessment, nutritional status evaluation, and cancer detection. The modalities for interpreting the impedance information have also developed quickly over the recent decades from single frequency bioimpedance analysis to spectrum and to images.

Bioimpedance is measured by computing the relationship between voltage and current. In a current based bioimpedance measurement system, the stability of current source has a large influence on the performance of the system. This thesis compared three different voltage controlled current sources: enhanced Howland circuit, load-in-the-loop circuit driven by a current conveyor and double operational amplifiers circuit. These circuits were simulated in Multisim and manufactured into prototypes and tested in lab.

Effort has also been made to generate and collect signals with digital-to-analog convertor and analog-to-digital convertor. They were controlled by Arduino Uno and impedance was analyzed in Matlab.

Abstract [sv]

Mätning med elektrisk bioimpedans är vida använt idag för medicinsk övervakning. Användningsområden inkluderar bland annat bedömning av kroppssammansättning, uppskattning av nutritionsstatus och detektering av cancer. Modaliteterna för att tolka informationen från elektrisk bioimpedans har också utvecklats snabbt över de senaste årtionden, från analys med en frekvens  till spektrum och bilder.

Biompedans erhålls genom att ta fram sambandet mellan ström och spänning. I ett strömbaserat bioimpedans-system har spänningsskällans stabilitet en stor inverkan på systemets prestanda. Det här examensarbetet jämförde tre olika spänningsstyrda strömkällor: en förbättrad Howland-krets, en load-in-the-loop-krets drivs av en ström transportör och en krets med dubbeloperativförstärkare. Dessa kretsar simulerades i Multisim och producerades sedan som prototyper och testades i labb.

Försök har även gjorts med att generera och samla in signaler med digital-analog omvandling och analog-digital omvandling. De kontrollerades av Arduino Uno och impedans analyserades i Matlab.

Place, publisher, year, edition, pages
2015. , 52 p.
TRITA-STH, 2015:013
National Category
Medical Engineering
URN: urn:nbn:se:kth:diva-163528OAI: diva2:800585
Subject / course
Medical Engineering
Educational program
Master of Science - Medical Engineering
Available from: 2015-12-14 Created: 2015-04-07 Last updated: 2015-12-14Bibliographically approved

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