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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.