Final Report - Strategic Environmental Research and Development ...

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REPORT DOCUMENTATION PAGEForm ApprovedOMB No. 0704-0188Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, andcompleting and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense,Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding anyother provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TOTHE ABOVE ADDRESS.1. REPORT DATE (DD-MM-YYYY)3/30/20122. REPORT TYPEFinal Report3. DATES COVERED (From - To)3/2009-3/20124. TITLE AND SUBTITLE 5a. CONTRACT NUMBER09-C-00165b. GRANT NUMBERMagnetic Surface Modes and UXO/Clutter Classification and DiscriminationDiscrimination5c. PROGRAM ELEMENT NUMBER6. AUTHOR(S) 5d. PROJECT NUMBERMR-1658Drs. Thomas Bell and Daniel Steinhurst5e. TASK NUMBER5f. WORK UNIT NUMBER7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORTNUMBERSAIC, 4001 Fairfax Drive, Arlington VA22203Nova Research, 1900 Elkin StreetAlexandria, VA 223089. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR’S ACRONYM(S)SERDPStrategic Environmental Research andDevelopment Program11. SPONSOR/MONITOR’S REPORTNUMBER(S)12. DISTRIBUTION / AVAILABILITY STATEMENT13. SUPPLEMENTARY NOTES14. ABSTRACTThe basic objective of this research project was to develop an improved understanding of the fundamental physics underlying classificationand discrimination of unexploded ordnance (UXO) and clutter items using electromagnetic induction (EMI) data. This improvedunderstanding can help to establish a rational basis for the development and implementation of improved UXO/clutter discriminationprocessing and analysis techniques capable of fully exploiting the capabilities of new EMI sensor technologies purpose-built for targetclassification.We proposed to assemble a comprehensive database of EMI signatures of UXO and clutter items from a variety of active clearance sitesusing the ESTCP MR-200601 time domain EMI array. The objective was then to work with this library to relate the structure of the EMIsignatures to the fundamental physical aspects of the EMI response arising from the magnetic surface mode and the bulk eddy currentdecay regimes, and establish bounds on the information content of the EMI signatures in the two regimes and their significance forUXO/clutter classification and discrimination.15. SUBJECT TERMS16. SECURITY CLASSIFICATION OF: 17. LIMITATIONOF ABSTRACT18. NUMBEROF PAGES19a. NAME OF RESPONSIBLE PERSONa. REPORT b. ABSTRACT c. THIS PAGE 19b. TELEPHONE NUMBER (include areacode)Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18
AbstractThis research project concerns the fundamental physics of the electromagnetic response ofmunitions items and metallic clutter and its application to procedures for the classification ofunknown buried objects using electromagnetic induction (EMI) data. The EMI response for acompact steel object exhibits an early algebraic regime wherein the response transitions from t -1/2to t -3/2 decay, followed by a late regime characterized by an exponential decay of the response.The early, algebraic regime is associated with eddy currents confined near the surface of theobject (magnetic surface modes), and its progress is described by the classical mathematics ofdiffusion. At late times the eddy currents have diffused throughout the object and the responsedecays exponentially.An extensive database of EMI responses for munitions and clutter items was assembled for thisproject. The database has been used to explore the significance of the two regimes forclassification. Our basic conclusion is that a decay time interval of about 0.1 ms to 3 ms isadequate for classification. This range lies within the magnetic surface mode regime for mosttargets of interest.This report includes detailed descriptions of the EMI signature database, parameterization of theEMI signatures and their interpretation in terms of magnetic surface modes and exponentiallydecaying body modes.
Page 1: FINAL REPORTMagnetic Surface Modes
Page 5 and 6: List of TablesTable 1. MR-1595 targ
Page 7 and 8: List of AcronymsBUDDARPAEMIESTCPGEM
Page 9 and 10: AcknowledgementsThis project was a
Page 11 and 12: BackgroundIntroductionOver the past
Page 14 and 15: (11)V(t) = −μ 0 n R n T C R (r 0
Page 16 and 17: in blue. Finely spaced gray lines a
Page 18 and 19: Figure 5. Comparison of quadrature
Page 20 and 21: Although useful, these EMI signatur
Page 22 and 23: Materials and MethodsData Collectio
Page 24 and 25: Figure 9. (a) EMI response curves m
Page 26 and 27: have used the site for testing and
Page 28 and 29: ProjectilesMunition Type Variants M
Page 30 and 31: Figure 14. Principal axis polarizab
Page 32 and 33: transfer coefficient h according to
Page 34 and 35: around ½ depending on the object [
Page 36 and 37: We have considered the utility of u
Page 38 and 39: Figure 22. Ringdown for different T
Page 40 and 41: Figure 25. Classification performan
Page 42 and 43: Conclusions and Implications for Fu
Page 44: 13. James B. Kingdon, Bruce J. Barr

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