Accession Number:

ADA495842

Title:

EM61-MK2 Response of Three Munitions Surrogates

Descriptive Note:

Interim rept. Nov-Dec 2008

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH

Report Date:

2009-03-12

Pagination or Media Count:

31.0

Abstract:

Target response coefficients for three pipe nipples intended as surrogates for 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 the three 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 surrogates at the NRL Blossom Point Test site to confirm the predictions. The predicted EM61-MK2 signals are presented graphically as plots of the minimum signal expected at the second time gate as a function of distance from the sensor 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 depths corresponding to 3x, 5x, 7x and 11x the objects diameter and all the results obtained are attached electronically as a spreadsheet.

Subject Categories:

  • Miscellaneous Detection and Detectors
  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE