II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
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R. Gross, A. Marx, and F. Deppe © Wal<strong>the</strong>r-Meißner-Institut (2001 - 2013)<br />
4.5 <strong>Applications</strong> <strong>of</strong> SQUIDs<br />
4.5.1 Biomagnetism<br />
AS-Chap. 4 - 60<br />
biomagnetic method:<br />
- non-invasive detection <strong>of</strong> magnetic signals from human body<br />
biomagnetic imaging:<br />
- field map <strong>of</strong> heart / brain activity source location<br />
(only simple volume conductor models are needed)<br />
MEG: magnetoencephalography<br />
MCG: magnetocardiography<br />
extremely small fields:<br />
brain: 100 fT (one neuron: 0.1 fT), heart: 10 pT<br />
highly sensitive SQUID magnetometers<br />
low 1/f noise<br />
spatial and temporal magnetic<br />
field distribution:<br />
array <strong>of</strong> SQUID sensors (multichannel systems)<br />
(or scan single SQUID)
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