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Spatial Retrieval of Broadband Dielectric Spectra

  • A broadband soil dielectric spectra retrieval approach ( 1 MHz– 2 GHz) has been implemented for a layered half space. The inversion kernel consists of a two-port transmission line forward model in the frequency domain and a constitutive material equation based on a power law soil mixture rule (Complex Refractive Index Model - CRIM). The spatially-distributed retrieval of broadband dielectric spectra was achieved with a global optimization approach based on a Shuffled Complex Evolution (SCE) algorithm using the full set of the scattering parameters. For each layer, the broadband dielectric spectra were retrieved with the corresponding parameters thickness, porosity, water saturation and electrical conductivity of the aqueous pore solution. For the validation of the approach, a coaxial transmission line cell measured with a network analyzer was used. The possibilities and limitations of the inverse parameter estimation were numerically analyzed in four scenarios. Expected and retrieved layer thicknesses, soil properties and broadband dielectric spectra in each scenario were in reasonable agreement. Hence, the model is suitable for an estimation of in-homogeneous material parameter distributions. Moreover, the proposed frequency domain approach allows an automatic adaptation of layer number and thickness or regular grids in time and/or space.

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Metadaten
Document Type:Article
Author:Dr. Jan BumbergerORCiDGND, Dr. Juliane MaiGND, Felix Schmidt, Peter Lünenschloß, Dr. Norman WagnerORCiDGND, Dr. habil. Prof. Hannes TöpferGND
DOI (Cite-Link):https://doi.org/10.3390/s18092780Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20180906-37831Cite-Link
URL:http://www.mdpi.com/1424-8220/18/9/2780
Parent Title (English):Sensors
Language:English
Date of Publication (online):2018/08/23
Year of first Publication:2018
Release Date:2018/09/06
Publishing Institution:Bauhaus-Universität Weimar
Institutes:An-Institute / Materialforschungs- und -prüfanstalt an der Bauhaus-Universität
First Page:1
Last Page:22
Tag:dielectric materials; dielectric measurements; electromagnetic scattering; microwave propagation
GND Keyword:Theoretische Elektrotechnik
Dewey Decimal Classification:500 Naturwissenschaften und Mathematik / 530 Physik / 530 Physik
BKL-Classification:33 Physik / 33.00 Physik: Allgemeines
Licence (German):License Logo Creative Commons 4.0 - Namensnennung (CC BY 4.0)