Magnetic Source Imaging Using a Pulsed Optically Pumped Magnetometer Array

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 dynam...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2019-02, Vol.68 (2), p.493-501
Main Authors: Borna, Amir, Carter, Tony R., DeRego, Paul, James, Conrad D., Schwindt, Peter D. D.
Format: Article
Language:English
Subjects:
Arrays
Coils
Current distribution
Current distribution imaging
Image reconstruction
Inverse problems
Laser excitation
Laser tuning
magnetic field map
Magnetic fields
Magnetic resonance imaging
magnetic source imaging (MSI)
Magnetism
magnetometer
Magnetometers
OPM
OTHER INSTRUMENTATION
Pump lasers
spin-exchange-relaxation-free (SERF)
Superconducting magnets
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Description
Summary: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. 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.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2018.2851458