Abstract: A method for monitoring a first attribute of a target object within a non-magnetic structure using a first probe coupled to the non-magnetic structure and located proximate the target object at a first detection region, the method includes a) introducing, at the first detection region, a pulsed electromagnetic interrogation signal along the electromagnetic circuit and through the target object using a first transmitter; b) receiving, at the first detection region, a response electromagnetic signal that is induced in the target object and generating a corresponding response electrical signal comprising time information and voltage information using a first receiver; c) determining the first attribute of the target object at the first detection region; d) generating a corresponding first output signal; and e) comparing one of the first output signal and the first attribute, to a stored value for the first detection region to determine if a condition is met.

Abstract: A non-destructive method for determining at least one of a cover depth and a cross-sectional area of at least a first ferrous rebar that is within a non-magnetic can include the steps of: a) establishing an electromagnetic circuit comprising the first ferrous rebar, a electromagnetic coupler, a first transmitter and a first receiver; b) introducing a first pulsed electromagnetic interrogation signal along the electromagnetic circuit; c) receiving a response electromagnetic signal having first magnitude that is induced in the first ferrous rebar and generating a corresponding response electrical signal; d) determining at least one of the cover depth and the cross-sectional area of the first ferrous rebar based on time information and the voltage information and generate a corresponding first output signal using a response signal processor; e) providing a first user output based on the output signal using a user output module.