TY  - JOUR
A1  - Heuermann, Holger
A1  - Harzheim, Thomas
A1  - Cronenbroeck, Tobias
T1  - First SIMO harmonic radar based on the SFCW concept and the HR transfer function
JF  - Remote sensing
N2  - This paper presents a new SIMO radar system based on a harmonic radar (HR) stepped frequency continuous wave (SFCW) architecture. Simple tags that can be electronically individually activated and deactivated via a DC control voltage were developed and combined to form an MO array field. This HR operates in the entire 2.45 GHz ISM band for transmitting the illumination signal and receives at twice the stimulus frequency and bandwidth centered around 4.9 GHz. This paper presents the development, the basic theory of a HR system for the characterization of objects placed into the propagation path in-between the radar and the reflectors (similar to a free-space measurement with a network analyzer) as well as first measurements performed by the system. Further detailed measurement series will be made available later on to other researchers to develop AI and machine learning based signal processing routines or synthetic aperture radar algorithms for imaging, object recognition, and feature extraction. For this purpose, the necessary information is published in this paper. It is explained in detail why this SIMO-HR can be an attractive solution augmenting or replacing existing systems for radar measurements in production technology for material under test measurements and as a simplified MIMO system. The novel HR transfer function, which is a basis for researchers and developers for material characterization or imaging algorithms, is introduced and metrologically verified in a well traceable coaxial setup.
KW  - MUT measurement; scanner
KW  - transponder
KW  - SFCW
KW  - harmonic radar
KW  - nonlinear radar
Y1  - 2021
U6  - https://doi.org/10.3390/rs13245088
SN  - 2072-4292
N1  - This article belongs to the Special Issue "Nonlinear Junction Detection and Harmonic Radar"
VL  - 13
IS  - 24
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Hoffmann, Andreas
A1  - Uhl, Matthias
A1  - Ceblin, Maximilian
A1  - Rohrbach, Felix
A1  - Bansmann, Joachim
A1  - Mallah, Marcel
A1  - Heuermann, Holger
A1  - Jacob, Timo
A1  - Kuehne, Alexander J.C.
T1  - Atmospheric pressure plasma-jet treatment of PAN-nonwovens—carbonization of nanofiber electrodes
JF  - C - Journal of Carbon Research
N2  - Carbon nanofibers are produced from dielectric polymer precursors such as polyacrylonitrile (PAN). Carbonized nanofiber nonwovens show high surface area and good electrical conductivity, rendering these fiber materials interesting for application as electrodes in batteries, fuel cells, and supercapacitors. However, thermal processing is slow and costly, which is why new processing techniques have been explored for carbon fiber tows. Alternatives for the conversion of PAN-precursors into carbon fiber nonwovens are scarce. Here, we utilize an atmospheric pressure plasma jet to conduct carbonization of stabilized PAN nanofiber nonwovens. We explore the influence of various processing parameters on the conductivity and degree of carbonization of the converted nanofiber material. The precursor fibers are converted by plasma-jet treatment to carbon fiber nonwovens within seconds, by which they develop a rough surface making subsequent surface activation processes obsolete. The resulting carbon nanofiber nonwovens are applied as supercapacitor electrodes and examined by cyclic voltammetry and impedance spectroscopy. Nonwovens that are carbonized within 60 s show capacitances of up to 5 F g⁻¹.
Y1  - 2022
U6  - https://doi.org/10.3390/c8030033
SN  - 2311-5629
N1  - This article belongs to the Collection "Nanoporous Carbon Materials for Advanced Technological Applications"
VL  - 8
IS  - 3
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Hüning, Felix
A1  - Heuermann, Holger
A1  - Wache, Franz-Josef
T1  - Wireless CAN without WLAN or Bluetooth
JF  - CAN Newsletter
N2  - In two developed concepts, dual-mode radio enables CAN participants to be integrated wirelessly into a CAN network. Constructed from a few components, a protocol-free, real-time transmission and thus transparent integration into CAN is provided.
Y1  - 2018
IS  - December
SP  - 44
EP  - 46
PB  - CAN in Automation GmbH
CY  - Nürnberg
ER  -