Stray Magnetic Field Compensation with a Scalar Atomic Magnetometer

Abstract

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.

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

References in corpus (5)

• A room temperature 19-channel magnetic field mapping device for cardiac signals
• Detection of NMR signals with a radio-frequency atomic magnetometer
• Robust, High-speed, All-Optical Atomic Magnetometer
• Dual channel self-oscillating optical magnetometer
• All-optical magnetometry for NMR detection in a micro-Tesla field and unshielded environment

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