Evaluation of the electrical capacitance tomography system for measurement using 3D sensor

• Autorzy: Kryszyn Jacek , Wanta Damian , Smolik Waldemar T.

Identyfikatory

DOI

10.35784/IAPGOS.205

Warianty tytułu

PL

Ocena systemu elektrycznej tomografii pojemnościowej do pomiarów z wykorzystaniem sondy 3D

• Języki publikacji: EN

Abstrakty

EN

Further tests of EVT4 data acquisition system for electrical capacitance tomography are presented. The modular system, which can have up to 32 channels with an individual analogue to digital converter, was designed to ensure small uncertainty of capacitance measurement at high speed of imaging. The system’s performance in the context of 3D imaging was experimentally verified. In particular, we show that the measurement of changes in capacitance due to a small change of an electric permittivity distribution for the most distant electrodes in a suitably designed 3D sensor is possible using our system. Cross-plane measurements together with the measurements for the pairs of most distant electrodes are essential for accurate reconstruction of 3D distributions. Due to sensitivity of capacitance measurements obtained in the hardware, the measurements for all electrode pairs can be used in the inverse problem – the system of equations can be extended. Although the numerical condition number of a matrix of such a system is high, image reconstruction is possible from the data obtained in our system. The results of 3D image reconstruction for simple test objects are shown.

PL

Przedstawiono dalsze testy systemu akwizycji danych EVT4 do elektrycznej tomografii pojemnościowej. Modułowy system, który może mieć do 32 kanałów z indywidualnym przetwornikiem analogowo-cyfrowym, został zaprojektowany w celu zapewnienia małej niepewności pomiaru pojemności przy dużej prędkości obrazowania. Wydajność systemu w kontekście obrazowania 3D została zweryfikowana eksperymentalnie. W szczególności pokazujemy, że możliwy jest pomiar zmian pojemności wywoływanych niewielką zmianą rozkładu przenikalności elektrycznej dla najbardziej odległych elektrod odpowiednio zaprojektowanego czujnika 3D przy pomocy naszego systemu. Pomiary międzypłaszczyznowe wraz z pomiarami par elektrod najbardziej odległych są niezbędne do dokładnej rekonstrukcji rozkładów 3D. Ze względu na wrażliwość pomiarów pojemności uzyskanych w opracowanym urządzeniu, pomiary dla wszystkich par elektrod mogą być wykorzystane w problemie odwrotnym – układ równań może zostać rozszerzony. Chociaż współczynnik uwarunkowania numerycznego macierzy takiego układu jest wysoki, możliwa jest rekonstrukcja obrazu z wykorzystaniem danych uzyskiwanych w naszym systemie. Pokazane są wyniki rekonstrukcji obrazu 3D dla prostych obiektów testowych.

Słowa kluczowe

EN

electrical capacitance tomography; image reconstruction; capacitance measurement; inverse problem; numerical stability

PL

elektryczna tomografia pojemnościowa; rekonstrukcja obrazów; pomiar pojemności; problem odwrotny; stabilność numeryczna

• Wydawca: Wydawnictwo Politechniki Lubelskiej
• Czasopismo: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
• Rocznik: 2019
• Tom: T. 9, nr 4
• Strony: 52--59
• Opis fizyczny: Bibliogr. 41 poz., rys., tab.

Twórcy

autor

Kryszyn Jacek

• Warsaw University of Technology, Division of Nuclear and Medical Electronics, Institute of Radioelectronics and Multimedia Technology, Warsaw, Poland

autor

Wanta Damian

• Warsaw University of Technology, Division of Nuclear and Medical Electronics, Institute of Radioelectronics and Multimedia Technology, Warsaw, Poland

autor

Smolik Waldemar T.

• Warsaw University of Technology, Division of Nuclear and Medical Electronics, Institute of Radioelectronics and Multimedia Technology, Warsaw, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).