@article{sander_marhl_jazbinšek_2021, 
  title={Avoiding non-linearity of optically pumped magnetometer MEG within an actively shielded two-layer mu-metal room}, 
  DOI={10.1515/cdbme-2021-2138}, 
  abstractNote={<jats:title>Abstract</jats:title>
               <jats:p>Some optically pumped magnetometer (OPM) sensors available for biomagnetic investigations have a linear range limited to +- 1 nT due to the specific properties of their open loop operation. In a two-layer magnetically shielded room of type Ak3b/Vacoshield Advanced with an external active compensation we studied how much sensor movement is allowed until amplitudes exceed the linearity range. Intentional movements were performed by a subject wearing an OPM-MEG sensor array. It was found that movements of 8 cm did yield non-linear amplitudes, but a reduction of the movement in half already preserves linearity. Despite movements, the heartbeat was found to generate a periodic signal, although the generating mechanism could not be identified so far.</jats:p>}, 
  publisher={Walter de Gruyter GmbH}, 
  author={Sander, Tilmann H. and Marhl, Urban and Jazbinšek, Vojko}, 
  year={2021}, 
  month={Oct}
  }