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Magnetic field imaging with microfabricated optically-pumped magnetometers.

Orang Alem, Rahul Mhaskar, Ricardo Jiménez-Martínez

|April 7, 2017

Summary

This study introduces a 25-sensor array of microfabricated optically-pumped magnetometers for magnetic field imaging. The system achieves high sensitivity, enabling detailed magnetic field mapping with compact, low-power sensors.

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Area of Science:

Physics
Instrumentation
Magnetometry

Background:

Accurate magnetic field measurement is crucial for various scientific and technological applications.
Existing magnetic field sensors face limitations in sensitivity, spatial resolution, or power consumption.

Purpose of the Study:

To develop and characterize a novel multichannel imaging system using microfabricated optically-pumped magnetometers.
To demonstrate the system's capability for high-resolution magnetic field imaging.

Main Methods:

A 25-sensor array of microfabricated optically-pumped magnetometers was fabricated with small sensor probes (< 1 cm²).
The sensor array was operated at low ambient magnetic fields and in Earth's magnetic field.
Magnetic field imaging was performed using the sensor array to map fields from small probe coils.

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Main Results:

The sensor array achieved an average magnetic sensitivity of 24 fT/Hz^1/2 in low fields and 5 pT/Hz^1/2 in Earth's field.
Individual sensor heads consumed low power (76 ± 7 mW) and had a sensitive volume of 1.5 mm³.
Magnetic field imaging results showed good agreement with expected field patterns.

Conclusions:

The developed multichannel imaging system offers high magnetic sensitivity and spatial resolution.
This technology is suitable for detailed magnetic field mapping applications.
The compact and low-power design of the sensors enables versatile deployment.