Unexploded ordnance detection using imaging giant magnetoresistive (GMR) sensor arrays

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Description

False positive detections account for a great part of the expense associated with unexploded ordnance (UXO) remediation. Presently fielded systems like pulsed electromagnetic induction systems and cesium-vapor magnetometers are able to distinguish between UXO and other metallic ground clutter only with difficulty. The discovery of giant magnetoresistance (GMR) has led to the development of a new generation of integrated-circuit magnetic sensors that are far more sensitive than previously available room-temperature-operation electronic devices. The small size of GMR sensors makes possible the construction of array detectors that can be used to image the flux emanating from a ferrous object or from ... continued below

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13 pages; Other: FDE: PDF

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Chaiken, A., LLNL May 6, 1997.

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Description

False positive detections account for a great part of the expense associated with unexploded ordnance (UXO) remediation. Presently fielded systems like pulsed electromagnetic induction systems and cesium-vapor magnetometers are able to distinguish between UXO and other metallic ground clutter only with difficulty. The discovery of giant magnetoresistance (GMR) has led to the development of a new generation of integrated-circuit magnetic sensors that are far more sensitive than previously available room-temperature-operation electronic devices. The small size of GMR sensors makes possible the construction of array detectors that can be used to image the flux emanating from a ferrous object or from a non-ferrous object with eddy currents imposed by an external coil. The purpose of a GMR-based imaging detector would be to allow the operator to easily distinguish between UXO and benign objects (like shrapnel or spent bullets) that litter formerly used defense sites (FUDS). In order to demonstrate the potential of a GMR-based imaging technology, a crude magnetic imaging system has been constructed using commercially available sensors. The ability to roughly determine the outline and disposition of magnetic objects has been demonstrated. Improvements to the system which are necessary to make it into a high-performance UXO detector are outlined.

Physical Description

13 pages; Other: FDE: PDF

Notes

OSTI as DE00016377

Source

  • UXO Forum '97, Nashville, TN (US), 05/27/1997--05/30/1997; Other Information: Supercedes report DE98050996; PBD: 06 May 97

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  • Other: DE98050996
  • Report No.: UCRL-JC-127526
  • Report No.: CONF-9705185*--
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 16377
  • Archival Resource Key: ark:/67531/metadc625462

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  • May 6, 1997

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Jan. 3, 2017, 1:37 p.m.

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Chaiken, A., LLNL. Unexploded ordnance detection using imaging giant magnetoresistive (GMR) sensor arrays, article, May 6, 1997; (digital.library.unt.edu/ark:/67531/metadc625462/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.