Mr. Sven D. Isaacson Profile

Sven D. Isaacson

at Dartmouth College

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Proceedings Article | 30 May 2022 Presentation + Paper

Wideband EMI signatures of conductive pipes and wires

Sven Isaacson, Benjamin Barrows, Fridon Shubitidze

Proceedings Volume 12116, 1211616 (2022) https://doi.org/10.1117/12.2619083

KEYWORDS: Magnetism, Signal detection, Transmitters, Electromagnetic coupling, Target detection, Electromagnetism, Corrosion, Magnetic sensors, Lead, Image segmentation

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Detecting and mapping underground utilities remains a problem in the United States. Poor and outdated utility maps can lead to difficulty locating buried infrastructure. Aging and poorly maintained utility infrastructure can leak or fail, endangering public safety and the environment. Many geophysical sensing techniques have been used to locate and map buried infrastructure, including: acoustic methods, ground penetrating radar, passive magnetic fields, and low frequency electromagnetic fields – each with its own advantages and pitfalls. Our previous work has focused on exciting linear currents on PEC thin wires using 100-1000 kHz electric fields and observing the secondary magnetic field response of these wires. This paper extends that work and investigates the wideband electromagnetic signature of pipes in the ground. The effects of pipe material and inhomogeneity are examined by using the Method of Moments (MoM) and the Method of Auxiliary Sources (MAS). The surface-impedance boundary condition (SIBC) is used to account for the finite conductivity of the pipe.

Proceedings Article | 12 April 2021 Presentation + Paper

High frequency EMI sensing for detection and location of underground metallic utilities

Sven Isaacson, Caylin Hartshorn, Benjamin Barrowes, Fridon Shubitidze

Proceedings Volume 11750, 1175003 (2021) https://doi.org/10.1117/12.2588033

Read Abstract +

Detecting and locating underground metallic and non-metallic pipes and utilities remains a pressing problem for the US Department of Energy. Old and deteriorating pipes pose a public safety and environmental hazard but often can be difficult to locate due to poor mapping or broken tracing wires. Many geophysical sensing techniques have been applied to the problem, including: acoustic methods, ground penetrating radar, passive magnetic fields, and low frequency electromagnetic fields – each with its own advantages and pitfalls. This paper investigates a new technique for detecting subsurface pipes: high frequency electromagnetic induction (HFEMI) sensing. Utilizing a frequency range of 10 kHz – 15 MHz, HFEMI has been used successfully in the past for detecting and locating low-conducting subsurface targets such as improvised explosive devices (IED). In this paper, we show HFEMI can be used to induce a linear current in a target pipe which produces a secondary electromagnetic field that can be detected by an above-ground magnetic field receiver. Comparisons between numerical and experimental studies are presented for subsurface elongated conductors. The data is inverted and then validated against ground truth.

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