Share Email Print
cover

Proceedings Paper

Magnetic induction imaging with optical atomic magnetometers: towards applications to screening and surveillance
Author(s): Luca Marmugi; Sarah Hussain; Cameron Deans; Ferruccio Renzoni
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 21 October 2015
PDF: 11 pages
Proc. SPIE 9652, Optics and Photonics for Counterterrorism, Crime Fighting, and Defence XI; and Optical Materials and Biomaterials in Security and Defence Systems Technology XII, 965209 (21 October 2015); doi: 10.1117/12.2195482
Show Author Affiliations
Luca Marmugi, Univ. College London (United Kingdom)
Sarah Hussain, Univ. College London (United Kingdom)
Cameron Deans, Univ. College London (United Kingdom)
Ferruccio Renzoni, Univ. College London (United Kingdom)


Published in SPIE Proceedings Vol. 9652:
Optics and Photonics for Counterterrorism, Crime Fighting, and Defence XI; and Optical Materials and Biomaterials in Security and Defence Systems Technology XII
Roberto Zamboni; François Kajzar; Attila A. Szep; Douglas Burgess; Gari Owen; Harbinder Rana, Editor(s)

© SPIE. Terms of Use
Back to Top