Accession Number : ADA512794


Title :   Man-Portable Simultaneous Magnetometer and EM System (MSEMS)


Corporate Author : ENVIRONMENTAL SECURITY TECHNOLOGY CERTIFICATION PROGRAM OFFICE (DOD) ARLINGTON VA


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a512794.pdf


Report Date : Dec 2008


Pagination or Media Count : 48


Abstract : Pulsed induction sensors (particularly the Geonics EM61 Mk2) and total field magnetometers are the two primary sensors employed for detection of munitions and explosives of concern (MEC) on formerly used military properties. While these two sensors have a broadly overlapping performance envelope, each sensor has unique strengths. The EM61 is the better sensor for detection of small and/or nonferrous projectiles, while the magnetometer excels at detection of large, deep objects. Unfortunately, codeployment of the two sensors is normally impossible due to the active nature of pulsed electromagnetic (EM), which creates noise on any nearby magnetometer. A prior Environmental Security Technology Certification Program (ESTCP) project (MM-0208) developed the technology needed to codeploy these two sensors through the process of interleaving (sampling the magnetometer only between the EM61?s pulses when the EM61 is quiet) and deployed that technology on a vehicular platform. Under this project, a Man- Portable Simultaneous Electromagnetic Induction (EMI) and Magnetometer System (MSEMS) was developed. The interleaving hardware was made smaller and lighter to enable man-portable deployment. A box with standard interfaces was developed that allows any geophysical contractor with EM61s, total field magnetometers, and Global Positioning System (GPS) equipment in inventory to connect them to our interleaving hardware and collect high-quality, concurrent mag/EM61 data. Two physical configurations were developed using this hardware: 1) a configuration with an unmodified EM61 and the magnetometer four feet in front of the EM61 coil and 2) a configuration using an EM61, whose pulse repetition rate was slowed to allow the magnetometer to acquire interleaved data when placed in the middle of the EM61 coil. The system was demonstrated at Yuma Proving Grounds (YPG), Arizona.


Descriptors :   *MANPORTABLE EQUIPMENT , *MAGNETOMETERS , PROJECTILES , ELECTROMAGNETIC INDUCTION , GLOBAL POSITIONING SYSTEM , SYNCHRONISM , REPETITION RATE , DETECTORS , ELECTROMAGNETIC RADIATION


Subject Categories : Test Facilities, Equipment and Methods
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE