A Fast and Low-Cost Measuring System for Electrical Impedance Tomography

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F19%3APU134008" target="_blank" >RIV/00216305:26220/19:PU134008 - isvavai.cz</a>

Výsledek na webu

<a href="https://ieeexplore.ieee.org/abstract/document/9017338" target="_blank" >https://ieeexplore.ieee.org/abstract/document/9017338</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/PIERS-Spring46901.2019.9017338" target="_blank" >10.1109/PIERS-Spring46901.2019.9017338</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A Fast and Low-Cost Measuring System for Electrical Impedance Tomography

Popis výsledku v původním jazyce

Electrical impedance tomography (EIT) embodies a nondestructive, noninvasive method to estimate the conductivity distribution inside an object via measuring the surface voltage under simultaneous feeding with alternating current. The accuracy and speed of voltage measurement in the individual electrodes is a critical stage of the reconstruction as the most common, 16 electrode configuration requires 208 measuring cycles, including the current source switching. The paper discusses a designing procedure to produce a measuring card for an experimental tomograph, emphasizing measurement speed and accuracy as well as manufacturing costs reduction. Thus, the presented comparison of the card with various solutions relying on commercially available devices considers not only technical parameters but also overall cost. Importantly, the design approach consists in utilizing the MOSFET technology for galvanically isolated switching of the voltmeter or DAC electrodes and also current source switchovers. Each electrode is connected via 4 bidirectional switches (photocoupler) that replace mechanical relays. The employed Toshiba TLP3545A coupler exhibits the following characteristics: max open switch voltage – 60V; max control LED current – 3 mA; max current when closed – 4 A; max resistance when closed – 60 m; insulation voltage – 2.5 kV; min/max closed time 0.5/5 ms; min/max open time – 0.1/0.5 ms. All the parameters fundamentally determine the properties of the measuring card. The number of switches per electrode was chosen such that the card enables the user to connect the supply signal and the relevant measuring system to arbitrary dual polarity electrodes, facilitating simple measurement in adjacent, cross, polar, pseudo-polar, and other configurations.

Název v anglickém jazyce

A Fast and Low-Cost Measuring System for Electrical Impedance Tomography

Popis výsledku anglicky

Electrical impedance tomography (EIT) embodies a nondestructive, noninvasive method to estimate the conductivity distribution inside an object via measuring the surface voltage under simultaneous feeding with alternating current. The accuracy and speed of voltage measurement in the individual electrodes is a critical stage of the reconstruction as the most common, 16 electrode configuration requires 208 measuring cycles, including the current source switching. The paper discusses a designing procedure to produce a measuring card for an experimental tomograph, emphasizing measurement speed and accuracy as well as manufacturing costs reduction. Thus, the presented comparison of the card with various solutions relying on commercially available devices considers not only technical parameters but also overall cost. Importantly, the design approach consists in utilizing the MOSFET technology for galvanically isolated switching of the voltmeter or DAC electrodes and also current source switchovers. Each electrode is connected via 4 bidirectional switches (photocoupler) that replace mechanical relays. The employed Toshiba TLP3545A coupler exhibits the following characteristics: max open switch voltage – 60V; max control LED current – 3 mA; max current when closed – 4 A; max resistance when closed – 60 m; insulation voltage – 2.5 kV; min/max closed time 0.5/5 ms; min/max open time – 0.1/0.5 ms. All the parameters fundamentally determine the properties of the measuring card. The number of switches per electrode was chosen such that the card enables the user to connect the supply signal and the relevant measuring system to arbitrary dual polarity electrodes, facilitating simple measurement in adjacent, cross, polar, pseudo-polar, and other configurations.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/LO1401" target="_blank" >LO1401: Interdisciplinární výzkum bezdrátových technologií</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)

ISBN

978-1-7281-3403-1

ISSN

—

e-ISSN

—

Počet stran výsledku

5

Strana od-do

3751-3755

Název nakladatele

Neuveden

Místo vydání

neuveden

Místo konání akce

Řím

Datum konání akce

17. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000550769303125