Stray Magnetic Field Compensation with a Scalar Atomic Magnetometer

Details Stray Magnetic Field Compensation with a Scalar Atomic Magnetometer Stray Magnetic Field Compensation with a Scalar Atomic Magnetometer

2010-03-05

arxiv.org/abs/1003.1290v2

Physics

Instrumentation and Detectors

8 pages, 6 figures, 31 refs, v2 (with minor improvements) appearing in Rev.Sc.Instr. June 2010

Scientific paper

We describe a system for the compensation of time-dependent stray magnetic fields using a dual channel scalar magnetometer based on non-linear Faraday rotation in synchronously optically pumped Cs vapour. We detail the active control strategy, with an emphasis on the electronic circuitry, based on a simple phase-locked-loop integrated circuit. The performance and limits of the system developed are tested and discussed. The system was applied to significantly improve the detection of free induction decay signals from protons of remotely magnetized water precessing in an ultra-low magnetic field.

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