Improved mechanisms of active magnetic sensing for subterranean target discrimination

Nick Hanna; Wilson Ezequelle; Dylan Burns; Tian Xia; Dryver R. Huston

doi:10.1117/12.2622418

30 May 2022 Improved mechanisms of active magnetic sensing for subterranean target discrimination

Nick Hanna, Wilson Ezequelle, Dylan Burns, Tian Xia, Dryver R. Huston

Proceedings Volume 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII; 1211617 (2022) https://doi.org/10.1117/12.2622418
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

This paper describes an active magnetic sensing system that locates and distinguishes buried ferromagnetic and non ferromagnetic objects. The operating principle is that primary active magnetic fields interact with ferromagnetic and non ferromagnetic conductive materials to produce secondary fields that can be measured and interpreted. Ferromagnetic materials produce a secondary magnetic field by induced magnetization. Conductive materials produce secondary magnetic fields with eddy currents that counter the primary field. The system uses a compact array of four electronically geared, rotating multipole neodymium magnets to project the primary shape-controlled oscillating magnetic fields. Magnetometers measure the combined primary and secondary fields at a rate of 490Hz. The data are then read into a mini PC to characterize in near real-time the composition of subterranean objects.

Conference Presentation

Citation Download Citation

Nick Hanna, Wilson Ezequelle, Dylan Burns, Tian Xia, and Dryver R. Huston "Improved mechanisms of active magnetic sensing for subterranean target discrimination", Proc. SPIE 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII, 1211617 (30 May 2022); https://doi.org/10.1117/12.2622418

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