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Stand-off sensing of material characteristics by polarimetric MMW radiometry

Peichl, Markus and Dill, Stephan (2018) Stand-off sensing of material characteristics by polarimetric MMW radiometry. In: Proceedings of SPIE, 10800 (4). SPIE. SPIE Security + Defence 2018, 2018-09-10 - 2018-09-13, Berlin. doi: 10.1117/12.2326966.

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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. Radar as an active remote sensing technology has great potential with respect to precise range measurements and spatial resolution. However, its mostly mono-static implementation suffers from low or no back reflection of signals in case of plane and tilted surfaces, delivering hence no information. In contrast radiometric imaging as passive remote sensing technology uses naturally generated noise-like radiation of thermal origin, being available everywhere and from all directions. Quite often the sky can be used as large illumination source, providing rather low radiation power compared to objects on Earth, using frequencies up to few hundred GHz. Furthermore, thermal radiation originally is un-polarized, but becomes polarized when reflected partly on a dielectric surface. Hence, the use of polarimetric measurements at various incidence angles can provide information on the type and structure of the reflecting object. The approach and the measurement setup are described. Experimental results of polarimetric measurements are shown and discussed.

Item URL in elib:https://elib.dlr.de/121527/
Document Type:Conference or Workshop Item (Speech)
Title:Stand-off sensing of material characteristics by polarimetric MMW radiometry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Peichl, MarkusUNSPECIFIEDhttps://orcid.org/0000-0003-0226-9786UNSPECIFIED
Dill, StephanUNSPECIFIEDhttps://orcid.org/0000-0001-6048-1107UNSPECIFIED
Date:September 2018
Journal or Publication Title:Proceedings of SPIE
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Series Name:SPIE Proceedings
Keywords:Material characterization, permittivity, radiometry, millimeter-waves, polarimetry, imaging, reflection, emission.
Event Title:SPIE Security + Defence 2018
Event Location:Berlin
Event Type:international Conference
Event Dates:2018-09-10 - 2018-09-13
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Deposited By: Peichl, Dr.-Ing. Markus
Deposited On:04 Sep 2018 08:25
Last Modified:20 Jul 2023 08:13

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