Patent ID: 8294458

Claim:
A method of determining a wanted linearization curve transfer function of a subject eddy current probe/cable system, the eddy current probe/cable system being coupled to an eddy current oscillator/driver, comprising the steps of: measuring an infinite gap response of the subject eddy current probe/cable system, correlating the measured response to one or more reference linearization curve transfer functions, and determining the wanted linearization curve transfer function by means of the correlation, determining an n th order polynomial with n+1 coefficients for each of the one of more reference linearization curve transfer functions, plotting separately each of the n+1 corresponding coefficients of the one or more reference linearization polynomial transfer functions against a corresponding infinite gap response, determining an m th order polynomial function for each of the n+1 plots, each of the n+1 m th order polynomial functions being a coefficient value of an nth order polynomial representing the wanted linearization curve transfer function, and determining each of the n+1 coefficients of the nth order polynomial representing the wanted linearization curve transfer function by entering the measured infinite gap response of the subject eddy current probe/cable system into each of the m th order polynomial.