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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/LO1401" target="_blank" >LO1401: Interdisciplinary Research of Wireless Technologies</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Article name in the collection

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

ISBN

978-1-7281-3403-1

ISSN

—

e-ISSN

—

Number of pages

5

Pages from-to

3751-3755

Publisher name

Neuveden

Place of publication

neuveden

Event location

Řím

Event date

Jun 17, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000550769303125