Magnetic Source Imaging Using a Pulsed Optically Pumped Magnetometer Array

Journal Article · 23 July 2018 · IEEE Transactions on Instrumentation and Measurement

DOI: https://doi.org/10.1109/tim.2018.2851458 · OSTI ID:1467028

Borna, Amir  ^[1]; Carter, Tony R. ^[1]; DeRego, Paul ^[2]; James, Conrad D. ^[1]; Schwindt, Peter D. D. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2. Kansas City National Security Campus, Albuquerque, NM (United States)

In this paper, we have developed a pulsed optically pumped magnetometer (OPM) array for detecting magnetic field maps originated from an arbitrary current distribution. The presented magnetic source imaging (MSI) system features 24-OPM channels has a data rate of 500 S/s, a sensitivity of 0.8 pT/√ Hz, and a dynamic range of 72 dB. We have employed our pulsed-OPM MSI system for measuring the magnetic field map of a test coil structure. The coils are moved across the array in an indexed fashion to measure the magnetic field over an area larger than the array. The captured magnetic field maps show excellent agreement with the simulation results. Finally, assuming a 2-D current distribution, we have solved the inverse problem using the measured magnetic field maps, and the reconstructed current distribution image is compared with that of the simulation.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; National Inst. of Health (NIH) (United States)
• Grant/Contract Number: NA0003525; R01EB013302
• OSTI ID: 1467028
• Report Number(s): SAND-2018-2741J; 661414
• Journal Information: IEEE Transactions on Instrumentation and Measurement, Vol. 68, Issue 2; ISSN 0018-9456
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English