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Ma, Xiaohu ; Bifano, Luca ; Oehme, Markus ; Fischerauer, Gerhard:
Validation of the suitability of electrical impedance spectroscopy for the in-situ monitoring of nitrate in sandy soil.
In: Reindl, Leonhard ; Wöllenstein, Jürgen
,
Informationstechnische Gesellschaft im VDE (VDE ITG); VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik (VDE GMA); AMA Verband für Sensorik und Messtechnik e. V.
(Hrsg.):
Sensoren und Messsysteme : Beiträge der 21. ITG/GMA-Fachtagung 10. – 11. Mai 2022 in Nürnberg. -
Berlin ; Offenbach
: VDI Verlag
,
2022
. - S. 352-355
. - (ITG-Fachbericht
; 303
)
ISBN 978-3-8007-5836-4
Abstract
This study presents the design and development of an impedance sensor to detect the nitrate concentration in soils based on the sensitivity of the soil dielectric constant to ion conductivity and on electrical double layer effects at electrodes. The impedance of samples with nitrate-nitrogen concentrations ranging from 0 to 15 mg/L was measured at frequencies between 20 Hz and 5 kHz and noticeable conductance and susceptance effects were observed. Based on the electrical impedance spectra and the known water content, two regression models using long short-term memory (LSTM) recurrent neural networks were implemented to predict the nitrate-nitrogen concentration in artificial soil (quartz sand). A coefficient of determination of R²=0.9580 was achieved with a model including the density of the soil as a feature, and R²=0.9295 was achieved with a model that did not include the soil density as a feature. This shows that the nitrate-nitrogen concentration could be determined almost independently of soil density. Hence, the sensing system has the potential to be used in real time and in situ to monitor nitrate concentration of soils.
Weitere Angaben
| Publikationsform: | Aufsatz in einem Buch |
|---|---|
| Begutachteter Beitrag: | Nein |
| Keywords: | Nitrate concentration; electrical impedance spectroscopy; artificial neural network; ANN; LSTM |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Mess- und Regeltechnik Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Mess- und Regeltechnik > Lehrstuhl Mess- und Regeltechnik - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer Fakultäten |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 13 Mai 2022 05:58 |
| Letzte Änderung: | 13 Mai 2022 08:37 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/69571 |