1. A method of inspecting a structure, the method comprising: selecting a search region of a dispersion curve of the structure corresponding to one or more inspection parameters, wherein the search region comprises at least one guided wave mode activation point not located on the dispersion curve; activating, using an inspection system comprising at least one transducer, a plurality of activation points located within the search region of the dispersion curve, wherein the search region comprises a fine tuning grid; and identifying an optimal activation point for the one or more inspection parameters, wherein the optimal activation point comprises at least one of the plurality of activation points producing an optimal response for the one or more inspection parameters.