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Measurement results from stand-off sensing of material characteristics by polarimetric MMW radiometry

Dill, Stephan and Peichl, Markus (2019) Measurement results from stand-off sensing of material characteristics by polarimetric MMW radiometry. In: Proceedings of SPIE, 11164, 403-1-403-7. SPIE Security + Defence 2019, 2019-09-09 - 2019-09-12, Strasbourg, Frankreich. DOI: 10.1117/12.2534030

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Abstract

The characterization of dielectric materials is of great importance for many applications, being for instance quality control during product fabrication or status control of outside constructions over time. In many outside situations the objects of interest have limited accessibility, and the investigation has to be done without destruction of any part of the object and without any health risks for an operator. Hence remote sensing from stand-off position is desirable, and the use of microwaves, millimeter-waves or THz waves offers some penetration capability into matter, depending on its chemical and physical decomposition and of course frequency. Many objects of interest consist of a dielectric coating or enclosure, which can electromagnetically be treated as a dielectric layered structure or a dielectric slab surrounded by air. In the recent past an approach has been established using polarimetric millimeter-wave radiometry for extracting the real part of the permittivity of surfaces. Hereby an imaging radiometer scanner has been used to measure the first three components of the Stokes vector of a scene containing various targets of interest. Those are for instance plane surfaces being tilted such that cold sky radiation is reflected towards the radiometer. It was shown experimentally that reasonable values for the permittivity of such surfaces could be extracted. However, more measurements are necessary to validate the method and to estimate possible error sources. Hence the paper will illustrate and discuss new measurement results.

Item URL in elib:https://elib.dlr.de/128796/
Document Type:Conference or Workshop Item (Speech)
Title:Measurement results from stand-off sensing of material characteristics by polarimetric MMW radiometry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dill, StephanStephan.Dill (at) dlr.dehttps://orcid.org/0000-0001-6048-1107
Peichl, MarkusMarkus.Peichl (at) dlr.dehttps://orcid.org/0000-0003-0226-9786
Date:24 October 2019
Journal or Publication Title:Proceedings of SPIE
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:11164
DOI :10.1117/12.2534030
Page Range:403-1-403-7
Series Name:Proc. of SPIE
Status:Published
Keywords:Polarimetry, radiometry, dielectric material, stand-off, MMW
Event Title:SPIE Security + Defence 2019
Event Location:Strasbourg, Frankreich
Event Type:international Conference
Event Dates:2019-09-09 - 2019-09-12
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Sicherheitsrelevante Erdbeobachtung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Deposited By: Dill, Stephan
Deposited On:19 Aug 2019 08:44
Last Modified:11 Nov 2019 14:28

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