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dc.contributor.authorWyllie, Robert
dc.contributor.authorLi, Zhimin
dc.contributor.authorCook, Peter
dc.contributor.authorWakai, Ronald T.
dc.contributor.authorWalker, Thad G.
dc.descriptionPresented at the 2007 DAMOP meeting.en
dc.description.abstractWe present a portable Rb cell atomic magnetometer suited for biomagnetic measurements. Working in the spin-exchange relaxation free regime, we demonstrate an initial white noise floor of 60 fT/sqrt {Hz}. We show an adult magnetic cardiogram and demonstrate the feasibility of extending our measurements to fetal MCG. Based on previous experiments the noise floor can be further reduced by parametrically modulating the z-magnetic field, which also allows for the simultaneous measurement of the x and y field components using a single probe beam [1]. We will present the simple conversion of the magnetometer to a gradiometer that still uses a single probe beam. Finally, we discuss related technical advances over previous designs, including the replacement of bulky air convection heating apparatus by simple rf heating and an effective insulation material that allows 1 cm working distance from the subject at 180C temperature differential. [1] Z Li, R T Wakai, and T G Walker, Appl. Phys. Lett. 89, 134105 (2006)en
dc.description.sponsorshipThe National Institutes of Healthen
dc.format.extent2513920 bytes
dc.titleA Portable Ultrasensitive SERF Atomic Magnetometer for Biomagnetic Measurementsen

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  • UW Atom Trainers
    Materials from the research group of Professor Thad G. Walker

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