A5005993410- Microwave Imaging and Scattering Analysis
- Radar Systems and Signal Processing
- Terahertz technology and applications
- Advanced SAR Imaging Techniques
- Advanced Optical Sensing Technologies
- Digital Media Forensic Detection
- Antenna Design and Analysis
- Electromagnetic Compatibility and Measurements
- RFID technology advancements
- Full-Duplex Wireless Communications
- Image and Object Detection Techniques
- Advanced Control and Stabilization in Aerospace Systems
- Cultural Heritage Materials Analysis
- Robotics and Automated Systems
- Robotics and Sensor-Based Localization
- Insect and Arachnid Ecology and Behavior
- Transportation Systems and Safety
- Millimeter-Wave Propagation and Modeling
- Photoacoustic and Ultrasonic Imaging
- Indoor and Outdoor Localization Technologies
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Plant and animal studies
- Industrial and Mining Safety
- Ultrasonics and Acoustic Wave Propagation
- Biometric Identification and Security
Friedrich-Alexander-Universität Erlangen-Nürnberg
2020-2024
Technical University of Applied Sciences Wildau
2019
In this paper, new concepts for continuous 24/7 real-time monitoring of plants and insects with miniaturized terahertz (THz) systems are described experimentally tested. Thus, the first time, small-scale insights into instantaneous plant health but also in their long-term growth can be obtained. Using such compact THz systems, e.g. water uptake, insect infestation behavior pollinators (i.e. honey bees) pests measured dynamically non-invasively at virtually any position close biotope...
Historical documents contain essential information about the past, including places, people, or events. Many of these valuable cultural artifacts cannot be further examined due to aging external influences, as they are too fragile opened turned over, so their rich contents remain hidden. Terahertz (THz) imaging is a nondestructive 3D technique that can used reveal hidden without damaging documents. As noise predominantly present in reconstructed images processed by standard THz...
Reliable and convenient walk-through security scanning, which doesn't separate people or impede their movement, is an extremely challenging task. In this paper, a novel approach for check with overhead observation polarimetric target decomposition presented. The viewing angle of the scanner equals side-looking airborne radar. However, it will be shown that established methods remote-sensing are not well suited close-range radar imaging need to adapted due differences in geometry scenario....
Monostatic radar systems as well radars with separated but nearby-placed transmit and receive antennas are beneficial in terms of cost-efficiency miniaturization, which is necessary for their integration into compact or mobile devices <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref> , rid="ref2" xmlns:xlink="http://www.w3.org/1999/xlink">[2]</xref> networks that demand reciprocal transmission channels...
This paper presents results of studies on the use Terahertz (THz) imaging for contactless inspection handwritten and possibly sealed documents as a preliminary study THz-based historical documents. We investigated focused B-scans in transmission mode. As basis, some general aspects associated with scenario are presented. These include investigations ink well system's image resolution. For possible application scanning letters, one stacks two papers handwriting inside an envelope were investigated.
This article provides a concept study on the feasibility of microwave imaging for in vivo screening knee implants. Using condition monitoring avoids patients' exposure to X-ray, which is hazardous human health. Therefore, investigating potentials such technique worthwhile. Two essential aspects were investigated study: 1) propagation properties tissue and 2) capabilities synthetic aperture radar (SAR) polyethylene inlays. The first point addresses challenge strong absorption tissue, contains...
We propose a new concept for passive RFID tags and an associated reading decoding strategy. The information is encoded in the orientation of small wires inside tag. A circular polarization millimeter-wave imaging system used as interrogation unit. Decoding achieved by reconstructing radar image tag using Hough transform to determine wires' orientations. demonstrate first-ever use multilayer image-based tags. According our results, up four layers can be used. An content 251 bit (7 bit/cm <sup...
Recently, a novel chipless radio-frequency identification (RFID) concept based on polarimetric radar barcodes was introduced. These tags are similar to the well known optical quick response codes (QR codes). In information is stored as polarimetrically coded areas arranged in grid and read out by an imaging radar. This paper presents for elegantly creating dipole scattering domains. Each domain consists of several hundred dipoles. The dipoles either uniformly at specific angle, which...
Cutting-edge personnel security screening relies on microwave imaging, where addressing future demands entails integrating digital twins into development and testing processes. To create a realistic twin for imaging systems, accurate replication of images obtained from scanning real individuals is crucial, achieved through electromagnetic simulation. Employing fast simulation methods reduces the computational load to viable level, yet it introduces some inaccuracies due underlying...
We propose the use of 3D-printed helix antennas for millimeter-wave radar imaging. This concept is promising a number reasons: Additive manufacturing involving 3D-printing relatively cost efficient fabrication technique and offers increased geometrical freedom design compared to conventional processes. From an imaging point view, using advantageous because circular polarization emit. That way, thin dipole-like structures possible regardless their orientation. In contrast, systems linearly...
State-of-the-art personnel screening systems reconstruct images by using multiple-input-multiple-output (MIMO) radars, which require a large number of transmit and receive channels along two-dimensional array. We propose novel concept for security does not the person to stand still only employs one- dimensional array: Our approach is built on use inverse synthetic aperture radar (ISAR) imaging based vertical line This means that moving inversely samples horizontal dimension. In order an...
This work introduces a compact planar implementation of self-interference cancellation coupler (SICC), which is designed for 24 GHz continuous wave (CW) radar frontends. The SICC utilizes part the TX signal modulated in amplitude and phase to generate signal, suppresses most severe TX-RX-leakage components. Instead using closed control loop minimize leakage, an approach with precise offline calibration used. We showed reproducibility this repeated isolation measurements applying calibrated...
Microwave security screening systems detect threats based on reconstructed radar images. Hence, aiming for the best possible reconstruction results is main target every personnel system. We introduce in this paper a computationally efficient imaging algorithm, that improves walk-through scanner notably by using an additional depth camera. To achieve this, body parts of passing human are automatically detected and tracked recorded frames. The determined trajectory then used to create inverse...