Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 30: Quantum Sensing: Applications I

FM 30.5: Talk

Tuesday, September 24, 2019, 15:15–15:30, Aula

Biomagnetic measurements with optically pumped magnetometers — •Thomas Middelmann, Stefan Hartwig, Victor Lebedev, Anna Jodko-Wladzinska, Rüdiger Brühl, Lutz Trahms, and Tilmann H. Sander — Physikalisch-Technische Bundesanstalt, Berlin, Germany

Optically pumped magnetometers (OPMs) pose an alternative method to measure tiny magnetic fields (fT-range) for applications that before could only be realized by superconducting quantum interference devices (SQUIDs) which essentially rely on cryogenic cooling. Biomagnetic methods such as Magnetoencephalography (MEG) or Magnetocardiography (MCG) can gain a lot from the flexibility of miniaturized OPMs. They enable to adapt the sensor arrangement to the individual shape of the body by mounting the sensors in a wearable 3D-printed structure. We present biomagnetic measurements with multichannel arrays of miniaturized OPMs, revealing the benefits and limits of today's best available OPMs. In particular we present stress-MCG, demonstrating the newly possible option to fix the sensors on the moving subject, and MEG of auditory evoked potentials, with an anatomy adapted sensor array, which enables a considerable reduction of the distance between field source and detector.