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Fig. 4. Cumulative sensitivity for soil model Types 1 and 2 calculated from forward numerical simulation results compared with low-induction-number (LIN) approximation: (A) horizontal (HCP) and (B) vertical (VCP) coplanar coil orientation. Relative depth is depth divided by intercoil separation. The first number in brackets is the upper layer electrical conductivity, the second number is lower layer electrical conductivity, both in mS m–1. In (B), to show underlying LIN VCP approximation curves, the lines for the VCP [0.1/0.2] and [0.2/0.1] soil models were removed.
