Magnetic Induction Imaging with Optical Atomic Magnetometers: Towards Applications to Screening and Surveillance

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Magnetic Induction Imaging with Optical Atomic Magnetometers: Towards Applications to Screening and Surveillance

Marmugi, L; Hussain, S; Deans, C; Renzoni, F; (2015) Magnetic Induction Imaging with Optical Atomic Magnetometers: Towards Applications to Screening and Surveillance. SPIE Proceedings , 9652 , Article 965209. 10.1117/12.2195482. Green open access

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Abstract

We propose a new approach, based on optical atomic magnetometers and magnetic induction tomography (MIT), for remote and non-invasive detection of conductive targets. Atomic magnetometers overcome the main limitations of conventional MIT instrumentation, in particular their poor low-frequency sensitivity, their large size and their limited scalability. Moreover, atomic magnetometers have been proven to reach extremely high sensitivities, with an improvement of up to 7 orders of magnitude in the 50 MHz to DC band, with respect to a standard pick-up coil of the same size. In the present scheme, an oscillating magnetic field induces eddy currents in a conductive target and laser-pumped atomic magnetometers, either stand-alone or in an array, detect the response of the objects. A phase-sensitive detection scheme rejects the background, allowing remote detection of the secondary field and, thus, mapping of objects, hidden in cargos, underwater or underground. The potential for extreme sensitivity, miniaturization, dynamic range and array operation paves the way to a new generation of non-invasive, active detectors for surveillance, as well as for real-time cargo screening. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Type:	Article
Title:	Magnetic Induction Imaging with Optical Atomic Magnetometers: Towards Applications to Screening and Surveillance
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1117/12.2195482
Publisher version:	http://dx.doi.org/10.1117/12.2195482
Language:	English
Additional information:	© Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Journal issue consists of selected papers from the Optics and Photonics for Counterterrorism, Crime Fighting, and Defence XI conference; and the Optical Materials and Biomaterials in Security and Defence Systems Technology XII conference, Toulouse, France, September 21, 2015
Keywords:	Optical Atomic Magnetometers, Magnetic Induction Tomography, Non-invasive Detection and Screening
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI:	https://discovery.ucl.ac.uk/id/eprint/1471995