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A High-Performance Portable Transient Electro-Magnetic Sensor for Unexploded Ordnance Detection.

Haofeng Wang1, Shudong Chen2, Shuang Zhang3

  • 1College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. whf@jlu.edu.cn.

Sensors (Basel, Switzerland)
|November 18, 2017
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Summary

This study details the design of a portable transient electromagnetic (TEM) sensor for detecting unexploded ordnance (UXO). The optimized sensor effectively detects and precisely locates UXO targets up to 1.2 meters away.

Keywords:
portable systemsensor internal noisetransient electromagnetic sensorunexploded ordnance (UXO)

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Area of Science:

  • Geophysics
  • Electrical Engineering
  • Sensor Technology

Background:

  • Portable transient electromagnetic (TEM) systems are crucial for detecting unexploded ordnance (UXO) in complex terrains.
  • The sensor, comprising transmitting and receiving coils, is the core component of TEM systems.

Purpose of the Study:

  • To describe the design and testing of a portable TEM sensor.
  • To optimize the transmitting coil for a strong primary field and fast current switch-off.
  • To minimize internal noise in the receiving coil for improved detection.

Main Methods:

  • Analyzed the impact of coil parameters (diameter, mass, power, turns, wire cross-section) on the transmitting coil's primary field.
  • Investigated factors affecting the receiving coil's internal noise (thermal noise, bandwidth, coil size, damping).
  • Constructed and experimentally validated a portable TEM sensor, measuring responses to UXO targets and using the differential evolution (DE) algorithm for inversion.

Main Results:

  • Transmitting coil performance is enhanced by higher mass-power product and larger diameter.
  • Reducing turns and increasing clamp voltage shortens current switch-off time.
  • Internal noise is minimized by reducing system bandwidth and increasing coil size; damping affects signal distortion.
  • The developed sensor detected an 82 mm mortar shell within 1.2 m and allowed precise localization.

Conclusions:

  • The designed portable TEM sensor effectively detects and precisely locates unexploded ordnance.
  • Experimental results validate the theoretical design principles for both transmitting and receiving coils.
  • The sensor demonstrates practical utility for UXO detection in challenging environments.