Assessment of the spatial distribution of moisture content in granular material using Electrical Impedance Tomography / Jan Porzuczek // W: Selected papers from the 9th World Congress on Industrial Process ... więcej

Assessment of the spatial distribution of moisture content in granular material using Electrical Impedance Tomography / Jan Porzuczek // W: Selected papers from the 9th World Congress on Industrial Process Tomography [Dokument elektroniczny] / ed. by Manuchehr Soleimani, Thomas Wondrak, Chao Tan. – Basel : MDPI, 2020. – S. 111-125 : il. (w tym kolor.). – Tryb dostępu: http://www.mdpi.com/books/pdfview/book/2035. – Bibliogr. 34 poz., Abstr. – Inf. na źródle: This is a reprint of articles from the Special Issue published online in the open access journal Sensors (ISSN 1424-8220) in 2019 (available at: https://www.mdpi.com/journal/sensors/specialissues/WCIPT9). – doi: 10.3390/books978-3-03928-249-4. – ISBN 978-3-03928-249-4 PDF. – ISBN 978-3-03928-248-7 Pbk

This paper presents a method for on-line determination of the spatial distribution of the moisture content in granular material. It might be essential for monitoring and optimal control of e.g. drying ... więcej

This paper presents a method for on-line determination of the spatial distribution of the moisture content in granular material. It might be essential for monitoring and optimal control of e.g. drying processes. The proposed method utilizes Electrical Impedance Tomography (EIT). As the exemplary material for experimental research the black chokeberry (Aronia melanocarpa) was used. The relationship between electrical impedance of chokeberry and its moisture content was determined for wide range of frequency (20Hz-200kHz). The EIT research consisted of both simulation as well as experimental investigation. Experimental studies of the spatial distribution of the moisture content was performed in the cylindrical vessel equipped with 8-electrode circumferentially arranged. Voltage signal from the electrodes was acquired simultaneously using data acquisition module. Due to high impedance of the chokeberries, exceeding 10^9 ohm for dried matter, extraordinary instrumentation was necessary to be applied. On the other hand raw chokeberry is characterized by several orders of magnitude lower impedance (10^3-10^4 ohm) especially for high frequency. Wide range of observed impedance was able to be measured owing to use of the voltage stimulation instead of the current stimulation (which is most common for EIT). The image reconstruction problem was solved using iterative Gauss-Newton algorithm and the EIDORS software package. The obtained results showed satisfactory ability to localize insufficiently dried part of the material. Prospect for the improvement of the imaging quality was also discussed.