Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public 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, and completing and reviewing this collection of information. Approved for public release; distribution is unlimited. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S)The Chemistry Division of the Naval Research Laboratory has developed the Multi-sensor Towed Array Detection System (MTADS) for the detection and classification of buried unexploded ordnance. In order to increase the discrimination ability of the system, we have developed advanced analysis algorithms for the Electromagnetic Induction (EMI) sensor data. In order to critically test the performance of these algorithms, we performed a magnetometer and two EMI surveys of a seeded, 10-acre site on the Impact Area of the Badlands Bombing Range, SD. We quantitatively compare the predictions from a baseline MTADS magnetometry analysis, an advanced EMI analysis, and a probabilistic neural net approach developed in a related SERDP program against actual remediation results. In addition, we discuss the performance of the EMI system in both a low-and high-SNR environment.
The Munitions Response Program (MRP) is charged with characterizing and, where necessary, remediating munitions-contaminated sites. During a cleanup, a site is typically mapped with a geophysical system, based on either a magnetometer or electromagnetic induction (EMI) sensor, and the locations of all signals above some detection criterion are excavated. Many of these detections do not correspond to munitions, but rather to other harmless metallic objects or geology: field experience indicates that often in excess of 95% of objects excavated during the course of a munitions response are found not to be munitions. Current technology, as it is traditionally implemented, does not provide a physics-based, quantitative, validated means to discriminate between munitions and nonhazardous items.
Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public 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, and completing and reviewing this collection of information. Target response coefficients for 13 commonly encountered UXO items were calculated from measurements made using the recently developed NRL Time-domain Electromagnetic Induction array. These response coefficients were used to predict the signals expected from an EM61-MK2, the most commonly used geophysical survey instrument for UXO, for each of these items as a function of orientation and distance of the center of the item below the bottom coil of the sensor. A series of EM61-MK2 survey measurements were made over the object at the NRL Blossom Point Test site to confirm the predictions. These predicted EM61-MK2 signals are presented graphically with the confirming survey measurements plotted on the same axes. The minimum signal at each of the four gates available from the EM61-MK2 is tabulated for a depth corresponding to 11× the object's diameter, the de facto expectation for detectability with modern geophysical equipment, and all the results obtained are attached electronically as a spreadsheet. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S)
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