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Proceedings Paper

Analysis of the effect of salt water on time domain electromagnetic induction sensing of submerged metallic objects
Author(s): Kevin O'Neill; Fridon Shubitidze; Benjamin E. Barrowes
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Paper Abstract

Relative to free-space or non-responsive media, salt water (SW) alters both primary and secondary electromagnetic induction (EMI) fields that pass through it. Effects appear distinctly in the frequency domain (FD), depending on both frequency and sensor-target distance, and may be distinctly quantified. Target signatures are distorted particularly over roughly the upper half log-space of the frequency range where distinctive response patterns may appear. This paper pursues the implications of those distortions when they are translated mathematically to the time domain (TD). Effects of sensor-target standoff, target composition and orientation are pursued. Within configurations of potential interest, SW effects appear strongly in very early time (< 0.1 ms); we investigate the extent to which these effects may spill over further into the early time (ET) range (~ 0.1 ms – 1 ms), which has been important for signal interpretation in sensing on land. Lastly, computations compare the relative magnitude of these SW effects in the secondary field (SF) with those from the SW background itself.

Paper Details

Date Published: 10 May 2019
PDF: 17 pages
Proc. SPIE 11012, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXIV, 110120I (10 May 2019); doi: 10.1117/12.2519181
Show Author Affiliations
Kevin O'Neill, Dartmouth College (United States)
Fridon Shubitidze, Dartmouth College (United States)
Benjamin E. Barrowes, Dartmouth College (United States)
USACE-CRREL (United States)

Published in SPIE Proceedings Vol. 11012:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXIV
Steven S. Bishop; Jason C. Isaacs, Editor(s)

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