Patent ID: 8778167

Claim:
A method of determining the location of a corrosion site in a body of reinforced concrete, the method comprising the steps of: engaging three spaced electrodes with respective measurement points on a surface of the concrete body, the measurement points defining an X-Y measurement plane and lying at respective X and Y coordinates on the X-Y measurement plane; measuring with the electrodes on the surface at each of the measurement points respective actual-value voltages; using a data processing system to calculate for each of the measurement points a Z coordinate spaced perpendicularly from the X-Y measurement plane by a distance proportional to the respective measured voltage; defining a planar polygon having three corners each with the X, Y coordinates of a respective one of the measurement points and spaced from the respective measurement points by the respective Z coordinate, whereby the planar polygon is tipped relative to the measurement plane when all the measured voltages are not identical; and projecting from the planar polygon perpendicularly onto the measurement plane a normalized vector and establishing as a direction from the measurement points to the corrosion site an extension of the normalized vector parallel to the measurement plane.