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Portable Magnetometry for Detection of Biomagnetism in Ambient Environments

Author(s): Limes, ME; Foley, EL; Kornack, TW; Caliga, S; McBride, S; et al

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dc.contributor.authorLimes, ME-
dc.contributor.authorFoley, EL-
dc.contributor.authorKornack, TW-
dc.contributor.authorCaliga, S-
dc.contributor.authorMcBride, S-
dc.contributor.authorBraun, A-
dc.contributor.authorLee, W-
dc.contributor.authorLucivero, VG-
dc.contributor.authorRomalis, MV-
dc.identifier.citationLimes, ME, Foley, EL, Kornack, TW, Caliga, S, McBride, S, Braun, A, Lee, W, Lucivero, VG, Romalis, MV. (Portable Magnetometry for Detection of Biomagnetism in Ambient Environments. Physical Review Applied, 14 (1), 10.1103/physrevapplied.14.011002en_US
dc.description.abstractWe present a method of optical magnetometry with parts-per-billion resolution that is able to detect biomagnetic signals generated from the human brain and heart in Earth’s ambient environment. Our magnetically silent sensors measure the total magnetic field by detecting the free-precession frequency in a highly spin-polarized alkali-metal vapor. A first-order gradiometer is formed from two magnetometers that are separated by a 3-cm baseline. Our gradiometer operates from a laptop consuming 5 W over a USB port, enabled by state-of-the-art microfabricated alkali-vapor cells, advanced thermal insulation, custom electronics, and compact lasers within the sensor head. The gradiometer has a sensitivity of 16 fT/cm/Hz1/2 outdoors, which we use to detect neuronal electrical currents and magnetic cardiography signals. Recording of neuronal magnetic fields is one of a few available methods for noninvasive functional brain imaging that usually requires extensive magnetic shielding and other infrastructure. This work demonstrates the possibility of a dense array of portable biomagnetic sensors that are deployable in a variety of natural environments.en_US
dc.relation.ispartofPhysical Review Applieden_US
dc.rightsAuthor's manuscripten_US
dc.titlePortable Magnetometry for Detection of Biomagnetism in Ambient Environmentsen_US
dc.typeJournal Articleen_US

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