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High-Resolution Millimeter-Wave Tomography System for Characterization of Low-Permittivity Materials

Tomographic microwave imaging is employed in numerous industrial applications, e.g., nondestructive testing. However, most existing systems are not suitable for measurements of low-permittivity materials such as gaseous substances or insulating foam with high air content. This paper introduces a 79...

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Main Authors:	Och, Andreas, Holzl, Patrick A., Schuster, Stefan, Schrattenecker, Jochen O., Freidl, Philipp F., Scheiblhofer, Stefan, Zankl, Dominik, Pathuri-Bhuvana, Venkata, Weigel, Robert
Format:	Conference Proceeding
Language:	English
Subjects:	Millimeter wave radar nondestructive testing permittivity Permittivity measurement Prototypes Radar antennas Radar imaging Sensor phenomena and characterization time of arrival estimation Tomography
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creator	Och, Andreas Holzl, Patrick A. Schuster, Stefan Schrattenecker, Jochen O. Freidl, Philipp F. Scheiblhofer, Stefan Zankl, Dominik Pathuri-Bhuvana, Venkata Weigel, Robert
description	Tomographic microwave imaging is employed in numerous industrial applications, e.g., nondestructive testing. However, most existing systems are not suitable for measurements of low-permittivity materials such as gaseous substances or insulating foam with high air content. This paper introduces a 79 GHz high-resolution tomography system enabling characterization of materials with relative permittivity close to one. It is based on fully-integrated frequency-modulated continuous-wave radar transceivers which significantly reduce cost and complexity. A first prototype is built with two radar sensors and a rotary stage to emulate a higher sensor count. The medium-dependent time-of-flight through the area-under-test is evaluated and Tikhonov regularization is applied to solve the inverse problem and reconstruct a 2D image. System simulations and measurements with low-permittivity foam objects confirm the feasibility of this approach.
doi_str_mv	10.1109/IMS30576.2020.9224048
format	conference_proceeding
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subjects	Millimeter wave radar nondestructive testing permittivity Permittivity measurement Prototypes Radar antennas Radar imaging Sensor phenomena and characterization time of arrival estimation Tomography
title	High-Resolution Millimeter-Wave Tomography System for Characterization of Low-Permittivity Materials
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