Active Underwater Detection with an Array of Atomic Magnetometers

TL;DR

This paper demonstrates the use of a 2x2 array of atomic magnetometers for active detection, localization, and tracking of conductive targets in air and water, achieving high success rates and potential applications across various fields.

Contribution

It introduces a novel array of atomic magnetometers for magnetic induction tomography, enabling real-time detection and localization in different media with high accuracy.

Findings

100% detection success rate in air and water

93% localization success rate

Effective detection up to 190 mm from sensors' plane

Abstract

We report on a 2x2 array of radio-frequency atomic magnetometers in magnetic induction tomography configuration. Active detection, localization, and real-time tracking of conductive, non-magnetic targets are demonstrated in air and saline water. Penetration in different media and detection are achieved thanks to the sensitivity and tunability of the sensors, and to the active nature of magnetic induction probing. We obtained a 100% success rate for automatic detection and 93% success rate for automatic localization in air and water, up to 190 mm away from the sensors' plane (100 mm underwater). We anticipate magnetic induction tomography with arrays of atomic magnetometers finding applications in civil engineering and maintenance, oil&gas industry, geological surveys, marine science, archeology, search and rescue, and security and surveillance.