Project Z2

Magnetoelectric Sensor Characterization

The essential goals of this project are functional characterization of the various ME sensors of the CRC (determination of the spectral distribution of the noise, the limit of detection, the cross sensitivity, and the directional characterization of the ME sensors), manufacturing of the measurement hardware, automation of measurement procedures, and measurement support for the biomedical applications in the corresponding B projects. To give quick access to the impact of material or design variations on ME sensor performance, a database and the corresponding interfaces to the measurement and characterization system as well as to the users (most of the A and B projects) will be established.

Results

Head Scanner Has Reached the Next Level

		The head scanner has been improved with respect to scanning speed, robustness, and saftety means. It is ready now to be used for patient measurements. First evaluations have been performed in close cooperation with the medical project B5.

A New Head Phantom for Investigation of Connected Soures in the Brain

		Furthermore, a head phantom for emulation of a network of connected sources in the brain has been designed in close cooperation with the rearchers from project B3. Small coils can be arbitrarily placed at designated postions. This allows us to generate a variety of source configurations and we are able now to create the corresponding magentic fields on the surface of our artifical head.

Role within the Collaborative Research Centre

The project Z2 will participate in the focus group F3 “Sensor Concepts” on collaborations for LOD measurements and noise analysis as well as realization of ME sensor frontends. Furthermore, it will participate in the focus group F6 “Biomagnetic Signal Analysis” on supporting biomagnetic measurements.

Specifically, this project will collaborate closely with all sensor-producing projects in terms of characterization of different types of ME sensors. In detail, collaborations with the following projects are planned:

A1:	Provide measurement results and schemes for limit of detection (LOD) and noise analysis via close collaboration
A2, A5:	Support with sensor characterization
A7:	Collaboration in LOD measurements and noise analysis of electrically modulated ME sensors
A8:	Transfer function measurements
A9:	SAW sensor characterization at carrier frequencies up to the GHz range
A10:	Conduction of noise density measurement
B1:	Takeover of analogue hardware concepts of individual sensors for ME sensor characterization and related frontends for biomedical applications
B2:	Takeover of digital signal processing routines for ME and SAW sensor characterization and for biomedical applications
B7:	Support with sensor characterization and non-magnetic motor concepts
B9:	Hardware support
B10:	Hardware support
T1:	Support for biomagnetic measurements and related data acquisition
Z1:	Provide measurement results and schemes for limit of detection (LOD) and noise analysis via close collaboration

Project-related Publications

P. Durdaut, C. Müller, A. Kittmann, V. Schell, A. Bahr, E. Quandt, R. Knöchel, M. Höft, J. McCord, Phase Noise of SAW Delay Line Magnetic Field Sensors. Sensors 2021, 21, 5631. https://doi.org/10.3390/s21165631

M. Yalaz, A. Teplyuk, G. Deuschl, M. Höft, Dipole Fit Localization of the Deep Brain Stimulation Electrode using 3D Magnetic Field Measurements, IEEE Sensors Journal, (2020). doi:10.1109/JSEN.2020.2988067

M.-Ö. Özden, A. Teplyuk, Ö. Gümüs, D. Meyners, M. Höft, M. Gerken, Magnetoelectric cantilever sensors under inhomogeneous magnetic field excitation, AIP Adv., vol. 10, no. 2, p. 025132, (2020), doi: 10.1063/1.5136239.

P. Hayes, M. Jovičević Klug, S. Toxværd, P. Durdaut, V. Schell, A. Teplyuk, D. Burdin, A. Winkler, R. Weser, Y. Fetisov, M. Höft, R. Knöchel, J. McCord, E. Quandt, Converse Magnetoelectric Composite Resonator for Sensing Small Magnetic Fields, Scientific Reports 9, 16355 (2019). https://doi.org/10.1038/s41598-019-52657-w

M. Yalaz, A. Teplyuk, M. Muthuraman, G. Deuschl, M. Höft, The Magnetic Properties of Electrical Pulses delivered by Deep Brain Stimulation Systems, IEEE Trans on Instrumentation and Measurement, (2019). doi:10.1109/TIM.2019.2945744

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