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    Item type:Publication, Access status: without files ,
    Transmit-receive circuit concepts for magneto-mechanical resonators
    (IEEE, 2026-01-19)
    Mohn, Fabian
    ;
    Thieben, Florian
    ;
    Faltinath, Jonas
    ;
    Knopp, Tobias
    Passive wireless sensors are crucial in modern medical and industrial settings to monitor procedures and conditions. We present two circuit concepts for the inductive excitation and signal reception of magneto-mechanical resonators, which are integrated into a transmit-receive signal chain. The focus is on comparing the concepts with respect to their ability to deliver power at different frequencies and to receive signals. Additional necessary components of the signal chain are illustrated for the full system context but not analyzed in detail. Instrumentation and design aim to be scalable for multi-channel arrays, using either off-the-shelf class-D audio amplifiers or a custom H-bridge.
    Publicationtype: Conference Paper
      39
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    Item type:Publication, Access status: without files ,
    Uncertainties of a spherical magnetic field camera
    (IEEE, 2025-10)
    Förger, Fynn
    ;
    Suskin, Philip Mark
    ;
    Boberg, Marija
    ;
    Faltinath, Jonas
    ;
    Knopp, Tobias
    Spherical harmonic expansions are well-established tools for estimating magnetic fields from surface measurements and are widely used in applications such as tomographic imaging, geomagnetism, and biomagnetism. Although the mathematical foundations of these expansions are well understood, the impact of real-world imperfections, on the uncertainty of the field model has received little attention. In this work, we present a systematic uncertainty propagation analysis for a magnetic field camera that estimates the field from surface measurements using a spherical array of Hall magnetometers arranged in a spherical t-design. A Monte Carlo-based approach is employed to quantify how sensor-related uncertainties, such as calibration errors and positioning inaccuracies, affect the spatial distribution of the estimated field's uncertainty. The results offer insights into the robustness of spherical harmonic methods and help identify the dominant sources of uncertainty in practical implementations.
    Publicationtype: Conference Paper
      29