Analysis of the effect of salt water on time domain electromagnetic induction sensing of submerged metallic objects

Kevin O'Neill; Fridon Shubitidze; Benjamin E. Barrowes

doi:10.1117/12.2519181

10 May 2019 Analysis of the effect of salt water on time domain electromagnetic induction sensing of submerged metallic objects

Kevin O'Neill, Fridon Shubitidze, Benjamin E. Barrowes

Author Affiliations +

Proceedings Volume 11012, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXIV; 110120I (2019) https://doi.org/10.1117/12.2519181
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

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.

Conference Presentation

Citation Download Citation

Kevin O'Neill, Fridon Shubitidze, and Benjamin E. Barrowes "Analysis of the effect of salt water on time domain electromagnetic induction sensing of submerged metallic objects", Proc. SPIE 11012, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXIV, 110120I (10 May 2019); https://doi.org/10.1117/12.2519181

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