2 August 1999 New quasi-static magnetic and electric field imaging arrays and algorithms for object detection, identification, and discrimination
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Abstract
Unlike radar-based imaging technologies that use electromagnetic waves, quasistatic imaging technologies operate at lower frequencies where electric and magnetic fields are decoupled. Magnetoquasistatic (MQS) devices, such as metal detectors, that impose magnetic fields satisfy the diffusion equation in conducting media and Laplace's equation in air or poorly conducting soils. Electroquasistatic (EQS) devices satisfy Laplace's equation. In Laplacian or diffusion decay, the amplitude of the magnetic and electric fields decay exponentially with distance from the drive windings or electrode. For quasistatic sensors, objects are detected and imaged through perturbations to the applied magnetic or electric fields that change the mutual transimpedances or transadmittances at the sensor terminals, rather than through time delays of reflected electromagnetic waves as in GPR.
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Neil J. Goldfine, Darrell E. Schlicker, Andrew P. Washabaugh, David Clark, Markus Zahn, "New quasi-static magnetic and electric field imaging arrays and algorithms for object detection, identification, and discrimination", Proc. SPIE 3710, Detection and Remediation Technologies for Mines and Minelike Targets IV, (2 August 1999); doi: 10.1117/12.357102; https://doi.org/10.1117/12.357102
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