Detail publikace

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

MIKULKA, J. DUŠEK, J. DĚDKOVÁ, J. PAŘÍLKOVÁ, J. MŰNSTEROVÁ, Z.

Originální název

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

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

EIT, multiplexor, low cost

Autoři

MIKULKA, J.; DUŠEK, J.; DĚDKOVÁ, J.; PAŘÍLKOVÁ, J.; MŰNSTEROVÁ, Z.

Vydáno

17. 6. 2019

ISBN

978-1-7281-3403-1

Kniha

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

Strany od

3751

Strany do

3755

Strany počet

5

URL

https://ieeexplore.ieee.org/abstract/document/9017338

BibTex

@inproceedings{BUT159717,
  author="Jan {Mikulka} and Jan {Dušek} and Jarmila {Dědková} and Jana {Pařílková} and Zuzana {Műnsterová}",
  title="A Fast and Low-Cost Measuring System for Electrical Impedance Tomography
",
  booktitle="2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)",
  year="2019",
  pages="3751--3755",
  doi="10.1109/PIERS-Spring46901.2019.9017338",
  isbn="978-1-7281-3403-1",
  url="https://ieeexplore.ieee.org/abstract/document/9017338"
}