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Comparing the performance of physical coil heads used in EMI systems is generally straightforward. Dimensions, wire diameters, transmit power, amplifier noise, winding patterns, etc., are known, so target and soil sensitivity can be easily measured or calculated and then compared. However, comparing the relative performance of different coil head configurations — i.e. only winding patterns without...
Continuous-wave (CW) electromagnetic induction (EMI) systems operating in the presence of magnetic soil often encounter issues with the voltage that the soil induces in the receive coil. Previously, an optimization procedure that represents the coils as stream functions and attempts to create coils to mitigate the effects of the soil was presented. In this paper, the optimization convergence is improved,...
Continuous-wave (CW) electromagnetic induction (EMI) systems operating in the presence of magnetic soil often encounter issues with the voltage that the soil induces in the receive coil. A formulation is developed to allow the calculation of the soil response of a CW EMI coil head that is represented by stream functions. This formulation is then included in an optimization procedure for stream-function...
Continuous-wave electromagnetic induction systems used for subsurface sensing often employ separate transmit and receive coils. In these systems, it is desirable to have zero mutual coupling between the transmit and receive coils and for the coils to have maximum sensitivity at a specific location. A representation of a pair of coils as stream functions on planar surfaces is created, and then a method...
Electromagnetic induction (EMI) systems often use separate transmit and receive coils. In these systems, it is desirable for the transmit and receive coils to have both minimal mutual coupling and a maximum field product, thus maximizing the detection depth. A mathematical representation is chosen for a pair of spiral coils that allows the coils to be optimized using an iterative convex method. This...
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