This report contains the theoretical analysis and computer programs for reflection type coils above multiple layered conductors. The performance of the coils when connected to phase-sensitive eddy-current instrumentation can be evaluated. The programs are written in both BASIC and FORTRAN for timesharing on the PDP-10 to calculate the effects of defects or variations in either conductivity or thickness Tor multiple conductors, all in the presence of lift-off variations. In addition, program options are included that allow the study of the design of the coil, the effects of small variations or drifts of all the coil, conductor and instrument parameters, and the effects of the instrument output and input impedance on the problem.
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