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Bad Homburg vor der Höhe, Germany

Friederich F.,Fraunhofer Institute for Physical Measurement Techniques | Baccouche B.,Fraunhofer Institute for Physical Measurement Techniques | Keil A.,Becker Photonik GmbH | Kahl M.,University of Siegen | And 3 more authors.
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz | Year: 2014

We report on the development of a stepped frequency continuous wave THz imaging system for process control in industrial environments. The system is based on a sparse line array consisting of 12 emitters and 12 heterodyne receivers operating in a frequency range between 75 GHz and 110 GHz. The applied multiple-input and multiple-output technique allows the reconstruction of THz images with 144 virtual pixels per line, while a band-conveyer below the line array provides the required feed motion of the sample for 3-D data acquisition. © 2014 IEEE. Source


Patzold M.,University of Siegen | Kahl M.,University of Siegen | Klinkert T.,IGI MbH | Keil A.,Becker Photonik GmbH | And 3 more authors.
IEEE Transactions on Terahertz Science and Technology | Year: 2013

We present a simulation and data-processing framework that incorporates full 3-D configuration, simulation, and reconstruction functionalities for hybrid synthetic aperture THz systems, which combine mechanically scanned real imaging projection (1-D) and synthetic imaging reconstruction (2-D). The simulation is based on a ray-casting approach including models for reflections at rough surfaces and angular antenna sensitivity. A near real-time GPU reconstruction is introduced to process large amounts of data in parallel. Techniques for fast fusion of reconstructed data from several acquisition directions are presented. They serve as basis to visualize a fully consistent 3-D object. The modular framework allows a fast, easy, and efficient evaluation and prediction of system properties including scattering behavior for these types of scanner setups. © 2011-2012 IEEE. Source


Baccouche B.,Fraunhofer Institute for Physical Measurement Techniques | Keil A.,Becker Photonik GmbH | Kahl M.,University of Siegen | Haring Bolivar P.,University of Siegen | And 3 more authors.
European Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings; 2015 45th European Microwave Conference Proceedings, EuMC | Year: 2015

Imaging systems operating in the sub-Terahertz frequency range have proven to be highly attractive devices for non-destructive testing applications. Especially frequency modulated system concepts have shown a great potential for volume inspection in industrial process and quality control, but often lack fast image acquisition times. We report on the development of a line array system for fast sub-Terahertz imaging applications. The realized system employs a sparse array consisting of 12 emitters and 12 heterodyne receivers and operates in the W frequency band between 75 GHz and 110 GHz. The applied stepped-frequency continuous-wave radar concept provides 35 GHz modulation bandwidth for fast volume inspections of large test objects in combination with a band-conveyor. © 2015 EuMA. Source


Krozer V.,Technical University of Denmark | Krozer V.,Goethe University Frankfurt | Loffler T.,Synview GmbH | Dall J.,Technical University of Denmark | And 7 more authors.
IEEE Transactions on Microwave Theory and Techniques | Year: 2010

This paper presents the research and development of two terahertz imaging systems based on photonic and electronic principles, respectively. As part of this study, a survey of ongoing research in the field of terahertz imaging is provided focusing on security applications. Existing terahertz imaging systems are reviewed in terms of the employed architecture and data processing strategies. Active multichannel measurement method isfound tobe promising for real-time applications among the various terahertz imaging techniques and is chosen as a basis for the imaging instruments presented in this paper. An active system operation allows for a wide dynamic range, which is important for image quality. The described instruments employ a multichannel high-sensitivity heterodyne architecture and aperture filling techniques, with close to real-time image acquisition time. In the case of the photonic imaging system, mechanical scanning is completely obsolete. We show 2-D images of simulated 3-D image data for both systems. The reconstruction algorithms are suitable for 3-D real-time operation, only limited by mechanical scanning. © 2010 IEEE. Source


Baccouche B.,Fraunhofer Institute for Physical Measurement Techniques | Kahl M.,University of Siegen | Keil A.,Becker Photonik GmbH | Bolivar P.H.,University of Siegen | And 3 more authors.
IRMMW-THz 2015 - 40th International Conference on Infrared, Millimeter, and Terahertz Waves | Year: 2015

Frequency modulated terahertz imaging systems have shown a great potential for volume inspections in the industrial process and quality control. However, many system concepts lack the capability to encompass a large field of view with fast data acquisition speed, while providing significant depth information. Based on our recently outlined system design of a terahertz imaging solution for the industrial process control, we report on the realization of a stepped-frequency modulated sparse array with 12 emitters and 12 heterodyne receivers operating in the frequency range from 75 GHz to 110 GHz. The system is ready to perform imaging tasks and will be in a final step combined with a band-conveyor for fast terahertz image acquisition. © 2015 IEEE. Source

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