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- W3000620844 abstract "Recording of magnetic fields generated by neuronal electrical currents is oneof a few available methods for non-invasive functional brain imaging. Thefields generated by such currents are about 100 million times smaller thanEarth's magnetic field. Most magnetoencephalography (MEG) systems use largemagnetic shields to screen Earth's field and magnetic field fluctuations. Wepresent a portable atomic gradiometer that demonstrates unshielded sensitivityof 16 fT/cm/Hz$^{1/2}$, and use it to detect MEG and magnetocardiography (MCG)signals. The gradiometer uses two cells containing $^{87}$Rb vapor that isinitially spin-polarized transverse to Earth's field. The $^{87}$Rbfree-precession frequencies, proportional to the total magnetic field, aremeasured with a probe laser. Combining state-of-the-art micro-fabricated vaporcells with advanced thermal insulation and custom electronics, we reduce thetotal system power to 5~W and run the sensor from a laptop. This workdemonstrates the possibility of magnetic neuroimaging in a variety of naturalenvironments." @default.
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- W3000620844 date "2020-01-07" @default.
- W3000620844 modified "2023-09-24" @default.
- W3000620844 title "Total-field atomic gradiometer for unshielded portable magnetoencephalography" @default.
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