Skip to main content
Article thumbnail
Location of Repository

New Proposal for the Detection of Concealed Weapons:\ud Electromagnetic Weapon Detection for Open Areas

By Alan Agurto Goya


Terrorist groups, hijackers, and people hiding guns and knifes are a constant and increasing threat Concealed weapon detection (CWO) has turned into one of the greatest challenges facing the law enforcement community today. Current screening procedures for detecting concealed weapons such as handguns and knives are common in controlled access settings such as airports, entrances to sensitive buildings and public events. Unfortunately screening people in this way prior to entering controlled areas is ineffective in preventing some weapons from getting through and also produces bottle-necks in crowded environments. Also the screening technologies employed have a high rate of false alarms due to poor discrimination capability. A reliable CWD that is able to work in open areas and a robust method capable to discriminate between ferromagnetic weapons are necessary.\ud \ud \ud This thesis reviews recent developments in the area of CWO using largely electromagnetic methods. The advantages and disadvantages of these approaches are discussed and a new research direction in CWO is presented. This thesis proposes a cost-effective weapon detection system based on pulse induction technology which is able to work in open areas without invading individual privacy. This approach employs a uniform magnetic field generator to transmit pulses that cause eddy currents to flow in any metal object carried by people. The induced eddy currents decay exponentially following sudden changes in the exciting magnetic field with a characteristic decay time (time constant) that depends on the size, shape, and material composition of the object. The decay currents generate a secondary magnetic field and the rate-of-change ofthe field is detected by the sensors. This thesis introduces models based on finite element analysis (FEA) to study the potential use of the time constant as a signature for weapon discrimination. Experimental work is also presented that confirms the theoretical predictions obtained from FEA. It is shown that further work on signature extraction and signal processing needs to be done to build the weapon signature database necessary for classification

Topics: T1, HV
OAI identifier:

Suggested articles


  1. A new approach for detecting The International ce and Assessment doi
  2. A perfectly matched layer for the absorption waves, doi
  3. ALF integrated platform for the enhancement of concealed weapon doi
  4. (1992). An introduction to Wavelets, Academic Press, doi
  5. Antennas for Concealed doi
  6. Bolometer and Thz imaging, Millimetre-w Finland –MilliLab-Microsensing seminar
  7. (2005). Concealed Wave sensors, . ICMMT '98. 1998 ave doi
  8. (2005). Concealed Weapon Detection using a magnetometer-based portal to detect potential threats [online]. Available at:
  9. (2005). Concealed weapons detection using l Society for Optical ies,
  10. (2007). Department of Justice, Final Report – Demonstration of a C Detection System Using Electromagnetic Resonances, Januar [Accessed 10
  11. (2002). Detection and classification of concealed weapons using a magnetometer-based portal, doi
  12. (2001). Guide to the Technolog
  13. (2003). Hand-Held Metal Detectors for Use in Weapons Detection and February
  14. (1998). Handheld ultrasound concealed weapons detec the SPIE, doi
  15. (2005). Imaging for Concealed Weapon Detection, doi
  16. (1985). Inductive Mining Prospecting, Elsevier,
  17. (1999). Initial evaluation ry prototype, room of the SPIE, doi
  18. (1996). Magnetic sensor technology for detecting mines, UXO, and other concealed security threats, doi
  19. (2004). Metal Detection and Classification Technologies,
  20. (1997). Millimetre-Wave an Processing
  21. Nano-tesla magnetic field mag InGaAs–AlGaAs–GaAs 2DEG Hall sensor, Sensors and Actuator 102, doi
  22. (2005). Non-Linear Acoustic Concealed doi
  23. (2009). On the time-domain electromagnetic response of a conductive g, permeable sphere, doi
  24. (2008). p15, Terahertz success relies on research investment [online]. Available at:
  25. Passive Millimeter-Wave Imaging, doi
  26. Passive Millimetre-wave camera, in doi
  27. (1815). Passive millimetre-wave imaging and how it differs from terahertz imaging, doi
  28. (2005). Phased Array Antenna Handbook, Second Edition, Artech House Publishers; 2nd edition ,
  29. (2001). Portable Concealed Weapon Millimeter Wave doi
  30. (2003). products, application note AN213, Set/rese at:
  31. Sensor Technology for CWD ......................
  32. (2003). SPIE AeroSense
  33. (1998). Technologies for Law. Alabama, U Investigation on Diagnostics and study of potential Genotoxic at: ed Imaging Arrays n,
  34. (1998). The research of inhomogeniety in eddy current sensors, doi
  35. (1995). Three-Dimensional Millimeter-Wave Microwave Theory d Screening, in doi
  36. (2001). Three-dimensional Steerable Magnetic Field Antenna for Metal Target Classification, in doi
  37. Understanding technologies of terror, doi
  38. (2001). Users’ Guide for Hand-Held and Walk-Through Metal Detectors,
  39. (2005). Using Ultrasound in Concealed Weapons
  40. (2003). Wide-Area Metal Detection System for Crow SPIE AeroSense

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.