1. Method for quantitatively estimating defects potentially present in an object comprising at least one outer surface, wherein the method comprises the steps of: a) “illuminating” the outer surface of the object with an inductive wave field at a predetermined frequency; b) measuring, at the outer surface of the object, an induced wave field ({right arrow over (H)}); c) developing, from the properties of the object's material, a coupling matrix T associated with a depth Z of the object from the outer surface; d) solving the matrix system ( [ H -> 0 -> 0 _ ] = T · J -> ) in order to determine a vector {right arrow over (J)} at depth Z; e) extracting a sub-vector {right arrow over (J)} S of the vector {right arrow over (J)}, corresponding to a potential defect on the object at depth Z; and f) quantitatively estimating the potential defect from the sub-vector {right arrow over (J)} S at depth Z, wherein the method is performed using a computer or processor.